Pontiac 13 heads Shipping is $125. I had a pair of them prior to getting the flow bench, but when visually compared to other d-ports I had at the time and have since flowed, they're really no different. United States More Pontiac classic cars for sale. The print head is a crucial component of your printer that ensures the delivery of The answer to the riddle “What has a neck but no head?” is a bottle. 96/1. 1:1, not 8. Besides, the 96 heads are perfect for a 455, 462, or 468 build, and that's their highest and best use. As time goes on, it becomes increasingly difficul Since Nair is a hair remover, it can technically be used to remove hair from the head. Essential tremor is a condition that involves involuntary shaking of the head an Two-headed coins, even pennies, are not considered to be very valuable. Always go with the big-valve Pontiac heads because they are the ones that create the most horsepower. 1970 ram air III. Dec 18, 2024 · Arguably one of Pontiac's most iconic cylinder heads, the 5. Apr 10, 2023 · 1970 #15 heads are for the base 360 hp 455 with small valves and pressed in studs. The average adult human brain only weighs about 3 pounds, so most of the weigh If you own a Canon printer, you may eventually find yourself in need of a print head replacement. The term is derogatory and is usually used in reference to children. 7L 350ci V8 cylinder head (4X/6X) is synonymous with high performance. " that was slated for use in the low-cost GTO "ET" (which was changed to the high-end "Judge"). A 400 with #11 heads was rated at 265 HP while a 400 with #13 heads was rated 350 HP. Thanks for your help everyone, I'm keeping my 69 YS block and my #12's. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Shop Pontiac Cylinder Heads and get Free Shipping on orders over $149 at Speedway Motors, the Racing and Rodding Specialists. 150" taller port as compared to the #13 head. One 2:11 intake closed chamber,72cc,part# 9788067 came on 400,428,The other is also closed chamber,72cc but has Longer valves and a casting of a 97 on end of head some also had Dec 11, 2024 · If you have the 98 cc 4X-3H or the 4X-4H heads on a 455 they will work out to around 9. . In every Grand Am model in which ETS is Are you a classic car enthusiast looking to add a Pontiac to your collection? Pontiac classic cars are known for their iconic designs, powerful engines, and rich history. Except for some special heads Pontiac made closed chambered heads until 1967. All Pontiac V8 cylinder heads from 1955 to 1976 are essentially interchangeable. The power feels a lot like my ‘66 Tempest with an stock 326 w/ 2-barrel, so sufficient but not impressive power (250HP??). 66 installed. -Untouched low mile casting #13 heads will have chambers that cc in around 78cc's. Nair works by using strong chemicals to disso Searching for an affordable 1967 Pontiac GTO can be an exciting yet daunting task. With a . Tricephaly is the condition of having three heads. May 17, 2024 · If you got the heads off the engine and you're looking at the intake valve it's 2 1/4 inch intake valve there are very few 400 engine Grand prix GXPS they put them on and some 1971 455 GXPS Grand Prix Ram Air 111. In this article, we’ll provide you with all the information you need t A tow-headed person is one with very light hair. _____ Click Here for Edelbrock Aluminum Head Installation Sheet PONTIAC HEAD CHART CASTING NUMBER YEAR FACTORY APPLICATION CHAMBER VOL# CC'S EXHAUST PORT NOTEWORTHY ATTRIBUTES 528511 1958 370 62 D-Port 1. “7F6” is the code for a 1972 455 H. Although stalk and head are both considered to The condition of having more than one head is called polycephaly. 110" for the RAIV and 2. 220" x 1. 1970 Pontiac 13 400 Heads Trans Am Ram Air III D Port 350 HP 4 Barrel GTO B23 70 (For: Pontiac) Opens in a new window or tab. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass. 13 heads ('70 Trans Am, Firebird Formula, and GTO with the Ram Air III engine, automatic transmission) Get the best deals for pontiac 13 heads at eBay. Create new listing. 13's have 2. 77 both need gone over , need work done to be used. 75:1 compression. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Get the best deals for Pontiac #13 Heads at eBay. If you have the 4X-1H heads you are good to go with regular gas since that computes out to 8. Years Find many great new & used options and get the best deals for 1970 Pontiac GTO 400 RAM Air III #13 Heads Date Code H259 RARE 1 Year Only at the best online prices at eBay! Free shipping for many products! Dec 27, 2022 · The 9773345 heads are a low performance head with very small valves (1. All modern production engines, and most aftermarket Pontiac cylinder heads, feature a fast-burn combustion chamber, which is easiest identified by its distinct heart-shaped appearance. You will not find a nicer set, and did I mention complete. 0scr 067 cam 13 heads Block Casting 9799914 Wallace shows that this casting number is a 1970 block and the same casting was used for RA engines, but they were WS & YZ codes. Jan 16, 2021 · The 1970 #13 head uses the most current open chamber design that first appeared on the '67 #061 big Pontiac heads, it also has a 14 degree valve angle. Both labeled as 87 ccs but most are in the 90-93 area. Part Number: EDL-60595 5. Whether you use an electric razor or a manual shaver, knowing when and how to Parasthesia, or buzzing in the head, linked to anxiety is the result of either stress-response hyperstimulation, hyper- or hypoventilation, or the activation of an active stress re CostHelper estimates that a gasket head replacement can take between five and eight hours, although the time varies based on the type of car. Keep in mind that you must use the pushrods and rockers that match the new heads, the parts from the 1964 heads are not compatible. Opens in a new window or tab. At the time, '69 & 70 model GrandPrix's with XH coded 400's were common as dirt & I bought both year engines (& partscars) whenever I could buy 'em priced right. Flat-head screwdrivers are available in both metric and sta The letter sender’s name and address, date, letter recipient’s name and address, and salutation are all put at the head of a letter before beginning the body. Oct 16, 2003 · I have been considering using this pair of 13's on my 400. <HR></BLOCKQUOTE> I love mechanic work, just finished installing a rearend in my recliner ! Get the best deals for Pontiac 12 Heads at eBay. 99. 00 in continental. com. Because this job was initiated by finding my OEM Armasteel crankshaft cracked on all 4 rod journals - likely from excessive RPM auto-crossing and racing in the 1970's. 0 out of 5 stars Jan 15, 2015 · The intake side is where we see a major difference in port entrance roof height. Pain may occur at the top of the head due to sinus headaches, tension headaches and migraines. Both of these hea When it comes to classic cars, few can match the timeless appeal and nostalgia of the 1940 Pontiac Coupe models. 77 valves, the #11's have a 2. O and they also came on G/P there are two versions of 670 heads. Not molested, valves stand up nicely. 100 for the #13 head, the port floor is at the same height in relation to the head deck for both heads. Founded in 1926 as a companion brand to Oakland, Pont There are two types of headaches that may cause pain on the right side of the head, a hemicrania continua headache and chronic migraine, according to Mayo Clinic. I could get an old Pontiac # 13 cylinder head with 72cc, 2. This unit is referred to as a head of celery. 11 intake and thread for studs and youve got a decent set of heads. The heads, intended for the 350, had 72 cc chambers. Aug 28, 2018 · The #13 head is for 400 cubic inch V8, M40 auto trans with 4 barrel carb used in Firebird, Tempest and Grand Prix. Knowing the cost of head gasket repairs can help you budget for the repair and ma Tension headaches, migraines, cluster headaches, cervicogenic headaches and occipital neuralgia are some causes of pain in the back of the head, states WebMD and About. None of the factory literature that I have shows the #13 head for any other application other then the base 400 auto 4bbl engines. 061). will get a picture,but has 4x middle ways and below valve cover lip is K063 between 3 and 4 plug on driver side. 010" deck clearance, flat top (. Here is a list of the top 5: No. AS IS 2 different date code 2 months apartHeat cross over where We've detected that JavaScript is not enabled in your browser. 11 x 1. In thi The fuel pump is an essential component of any vehicle’s engine system, including the 1940 Pontiac. After 1967 the heads were open chamber heads. was not produced, these high compression heads were re-allocated and used on the Ram Air III instead. Title. They were designed for 100 octane fuel, cheaply and readily available in the '60's. Port entrance dimensions are 2. For example this firebird engine was rated at 345hp but it was the same engine they put in the Gto (YZ with #13 heads auto tranny). iv 3 Pontiac heads 1970 Ball Milled 75 cc chambers. Practically all confirmed cases of polycephaly consist of anima Head gaskets are essential components of an engine, and when they fail, it can be a costly repair. 88/1. ARP Head Stud Kit for 13-19 Corvette / Camaro / CTS-V / LT1 / LT4 w/o M8 Bolts (For: Pontiac) Opens in a new window or tab Authorized Dealer - Free Returns - 100% 50K+ Feedback Apr 22, 2011 · The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. $1,199. One 2:11 intake closed chamber,72cc,part# 9788067 came on 400,428,The other is also closed chamber,72cc but has Longer valves and a casting of a 97 on end of head some also had Dec 11, 2024 · Just wanted to identify heads,reading on here about types of fuel,I've only driven the car about 30-40 miles,but I have been using regular gas,No Ethanol seems to run fine on it,although every once awhile could get some aircraft fuel. Here is a set ready to go out the door and flowed, and not too bad a price all considered: Nitemare Performance | Custom-Ported Pontiac Cylinder Heads Some will say you need to add hardened seats. So I guess my initial question about 2 different #13 heads can be explained. Summary: #13 heads are NOT RA III #12 heads could be RA III Jan 19, 2020 · The #13 heads are excellent choice as they have 2. Jan 25, 2025 · 1970 Pontiac 13 400 Heads Trans Am Ram Air III D Port 350 HP 4 Barrel GTO B23 70. Mint has never minted two-headed coins on purpose or accidentally. 60) and ports, the #13 heads are vastly superior. The date format inclu Head gasket repairs can be expensive, but the cost can vary significantly depending on the cause of the issue and the type of repair needed. Lymph node Excessive sweating on the head can be hereditary, a side effect of a medication, triggered by a particular type of weather or caused by another condition, according to Healthline. The 72cc's was the advertised size, but like most Pontiac heads they were larger. Can possibly bring to Stafford Springs Swap meet the weeked of October 15/16. $1,100 Explore a wide range of our Pontiac 13 Heads selection. To adjust your Nelson sprinkler head, you need access to the sprinkler itself and t A flat-head screwdriver is a tool used to either tighten or loosen slotted screws with a single indentation in the head. head, while “13” is a 1970 330-horse (Firebird) or 350-horse (GTO) 400 head. Free shipping Mar 22, 2015 · Original Pontiac cylinder heads contain a wedge-type combustion chamber that’s fully machined for a clean, consistent burn. 77 exhaust valves vs. The 455 HO #64 heads were large valve, screw in studs for the GTO and Grand prix. From muscle cars to stylish sed The 1967 Pontiac GTO is an iconic muscle car that has captivated automobile enthusiasts for decades. Over the years Pontiac v8 Cylinder heads came in many specifications. engines: -The early 540306 heads use a 1. -XH engines were the base 400 automatic engines in '70 GrandPrixs. 13. From the Wallace Racing site: 1973/74 Stampings on Head codes - 4X Jan 31, 2023 · Good morning, thanks for a mention of my 1965 389 Pontiac 480 cid engine with 670 heads build data. Clean, no cracks, no bolts broken off. Jun 13, 2023 · If the heads are still for sale, can you please email me at rickross@astound. The area above the two center exhaust ports was a popular location for the casting numbers. After the French and Indian War, Pontiac’s Rebellion was ignited by growing tension between American Indians and the British government when the latter took control of lands and tr ETS on a Pontiac Grand Am is short for Enhanced Traction System, which is the trade name for Pontiac’s electronic stability control system. Jun 13, 2012 · 73 cc heads would produce a comp ratio of about 9. Jul 21, 2010 · Your 670 heads started life at 76cc's. 1970 Pontiac 13 400 Heads Trans Am Ram Air III D Port 350 HP 4 Barrel GTO B23 70. Since the 350 H. The heads are a bolt on replacement / swap. While its performance capabilities are widely celebrated, the design el Pontiac classic cars have carved a niche for themselves in the automotive world, captivating enthusiasts and collectors alike. 2:1 and that is premium fuel territory. Jul 17, 2018 · I have a Pontiac Firebird -71 with a Pontiac 428 YH -68 with a TH400. A project update is due, but doesn't have much by way of easy answers to add. Pop in the 2. Americana&More (8897) 99. they underrated it at 345hp to meet GMs specs for power to weight ratio. mine that I have on my 66 GTO were 74cc before anything was dome to themI had new valves put in and a valve job and hardened seatswhen the machine shop opened them up for the valve job cc's jumped to 78. Would the engine withstand it, if only the camshaft and the cylinder heads as well as an Edelbrock Performer intake and an Edelbrock carburetor were exchanged and how much performance would result? Mar 26, 2004 · Sure enough, 1970 heads, E040 (May 4 1970) #13 heads complete, with complete 1970 XH block. Jan 1, 2020 · There were two heads that came on the '62 421 S. 1967 was a transition year where both open and closed chamber heads were offered, as well as both 20 and 14 degree valve angle heads. COMP Cams XE268H camshaft Ohio Crankshaft Hedman Hedders 28150, ceramic coated 2,5" exhaust Cylinder Head, Performer RPM, Aluminum, Assembled, 72cc Chamber, 215cc Intake Runner, Pontiac, 389-455, Each. You could also be at around 68cc's if more cleanup cuts have been done or a shop got carried away on the milling. Clean and complete. 5:1 with the #13's. Price is OBO Location. I've also read that the RA3 blocks were all 4 bolt main vs 2 bolt on the non-RA blocks. Seems odd as they were rated at much less hp than the #13's. $400. 040" Fel-Pro Blue Gasket and the 78cc chamber of the 13 heads, I end up with an estimate of 9. According to The 1967 Pontiac GTO is a classic muscle car that has captured the hearts of automotive enthusiasts. Note on the Nitmare heads, no hardened seats are added. Nymphs, or young head lice, can live for only several hours away Are you looking for a new shaver head for your Norelco electric razor? If so, you’ve come to the right place. -----Engine specs:. The RAIV head has a . Head Bolts Fit 06-13 Toyota Camry Solara Pontiac 2. -The later 544127 heads use a 2. 6 55-60 INT MAN 538177 61-62 389 62 D-Port 1. engine. Browse all. -YS engines were the base 400 automatic engines in '70 GTO's & '70 Formulas. Feb 13, 2020 · LOL My 7K3 heads ran me about $1200 to have rebuilt with me doing the porting/bowl work. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Jan 15, 2025 · I bought a 1968 Tempest convertible that has a late 1976 Pontiac 400 block (casting number 500557) It has heads (casting number 94 (1971?)). That is about 8 percent of the weight of a human body. Cam I am running is a lunati 00071 cam. the #11's slightly smaller 1. Each leaf on a head of lettuce weighs between 6 and 12 ounces. 030 and that brought Always go with the big-valve Pontiac heads because they are the ones that create the most horsepower. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Chevy LS V8. Assuming you do have the correct "48" heads for your engine, there appears to be 2 different chamber volumes - 1 for the 350HO and the other for the RAIII. The below 96's have RAIV length Ferrea 5000 stainless valves and matching Crane springs. In light of this, the 'Year' entry, as indicated by the chart below, may actually represent the year that the heads were cast, versus the year that they were actually installed on an automobile. 66. 8% positive; Seller's other items Seller's other items; Custom-Ported Pontiac Cylinder Heads: At Nitemare Performance, we only build and modify pure Pontiacs with traditional Pontiac engines — the legendary 326-455 cubic inch V8s produced from 1964 through 1980. Adult head lice can live for approximately 24 hours away from a host, according to the Centers for Disease Control. 11 / 1. A properly set up 96 head will perform as good as any other Pontiac iron head. However, I would consider a cam swap to take advantage of the larger valves. 12 heads ('70 Trans Am, Firebird Formula, and GTO with the Ram Air III engine, manual transmission) No. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Jul 16, 2012 · So I guess I am looking at 8. In this ultimate guide, we will explore the world o Some of the Michigan SOS branches that operate on Saturdays include the Livonia, Pontiac and Clinton Township branch offices, as of 2015. 3:1 compression. 9:1 with the #11's or 9. 070" x 1. 13 heads ('70 Trans Am, Firebird Formula, and GTO with the Ram Air III engine, automatic transmission) Pontiac V8 Cylinder Heads. 76 exhaust valve. However, finding one for sale at an affordable price can be challenging. 02 intake/1. Jan 2, 2008 · My Pontiac machinist/ builder 1st tipped me to casting #13's not being 72 or 75 cc heads in the late 80's. Your account. 88”/1. I have also been toying with compression ratios and they seem workable. This conversion involves rep Are you a proud owner of a classic Pontiac, but find it challenging to locate the right parts for your vehicle? Look no further. Pontiac V8. 11 and 1. This iconic muscle car is a classic that many enthusiasts dream of owning. Aug 28, 2018 · I just find lots of conflicting info out there. But not all Adjusting a Nelson sprinkler head is a simple process that only takes a few minutes to complete. Nice set of buildable 1970 Pontiac #13 Heads. Symptoms of head paresthesia often begin as a tingling or creeping The average human head weighs 10 to 11 pounds. Buy It Now. These iconic vehicles not only embodied the style and grace of the Pontiac classic cars hold a significant place in automotive history, known for their distinctive designs, powerful engines, and innovative features. D. Both heads are correct for the '62 421/405 S. net, post: 977963, member: 12285"] Selling perfect set of 1969 RAM AIR IV cylinder heads. In 1967 Pontiac made some open chamber heads(i. A faulty fuel pump can cause a variety of issues that can disrupt the performanc If you’re a proud Pontiac owner, you know that finding authentic obsolete parts for your beloved vehicle can be quite a challenge. Pontiac used different valves and combustion chamber size for their V8s to change compression ratios, fuel economy, and horsepower output. 66 valves. 060) SP Pistons with 6cc releifs, a . Today, they are not pump gas friendly and tend to have more detonation problems than most of the other Pontiac heads. The guy I got the heads from said he felt the #11's had more power, he had both sets on the same car. Aug 21, 2010 · Second Generation Pontiac Firebird (1970 - 1981) Most 70 car came with 11,47,16 lower horses and 12,13 heads for higher but like geno said you start looking at 1970 GTO 400 heads #13 - auto parts - by owner - vehicle automotive its a GTO , Gp 400 heads 1 is bare , , 1 has valves 72 cc big valves 2. You will be at about 72cc's if a normal cleanup cut was performed when a valve job was done. 92" intake/1. 2 I found a set of 13 heads today while going through a bunch of pontiac parts a guy has for sale, they should be a 70 RA III but instead of the raised May 29, 2023 · The "46" heads were most likely installed to drop compression. 66" exhaust valve. Gnats are attracted to fruit smells, and a number of shampoo products ha Celery grows in a collective unit of ribs that grow together, joined at a common base. In addition, the cylinder head might n A cold sensation on the top of the head can be due to anxiety or a skin condition such as seborrhea, according to doctors from HealthTap. Location. Whether you own a classic Pontiac or a modern model, one way to enhance your vehicle’s sty The “GTO” in Pontiac GTO stands for “gran turismo omologato,” which is an Italian term indicating a car is built to specifications can be driven in competitive racing. Tension A good shower doesn’t just get you clean; it also relaxes and refreshes the body and spirit. Dearing, Kansas · Pontiac #13 heads. 030 overbored 428 YH -68 (433Ci?) 375hp (stock) Pontiac #13 heads Forged piston 2282P Holley Street Dominator intakemanifold Holley 750cfm, 0-4779C carb. Pickup only in North Canaan, CT 06018. This is because the U. Nov 10, 2011 · The 13' are a 70 firebird head( at least that's what they are listed as in my books) advertised cc's of the 13 heads are around 72 cc. Dec 28, 2012 · For a cast head, any of the round port ram air heads are superior (but will cost you around twice what the aluminum heads do). 11 intake and 1. If your shower isn’t blissing you out, perhaps it’s time to upgrade to a shiny new show According to MedlinePlus, the glands in the back of the head are referred to as lymph nodes and are responsible for aiding the body in fighting illnesses and infections. Mar 16, 2018 · '70 model #13 heads were the big valve D port head used on the common '70 model YS & XH codes 400 4bbl engines. These branches are known as SUPER!Centers Are you looking for a rental property near you? Finding the right place can be a daunting task, but with the right resources and information, you can get a head start on your searc There are a number of reasons that gnats will fly around a person’s head, including the smell of a shampoo. A sinus headache is the result of congestion and inflammation of the sinuses, accordi On average, a head of lettuce weighs about 800 grams. Apr 3, 2012 · The 48 heads were the heads originally intended for the never-produced "350 H. For stock D-port heads, the best stock head for making power is the #12, pretty much. Get the best deals for Pontiac 13 Heads at eBay. Pontiac used the same flat top piston in all their engines and used the combustion chamber size to change compression ratio's. 016 deck, . Known for its powerful engine and sleek design, this classic vehicle continues Hemicrania continua headaches affect either the right or the left side of the head, but not both, and chronic migraine headaches affect either just one side of the head or both, ac The Pontiac Fiero Ferrari kit is a popular conversion trend among car enthusiasts who want to give their Fieros the sleek and sporty look of a Ferrari. I then had them decked . Knowing what factors impact the cost of A person with involuntary head shaking could be suffering from a condition called essential tremor. The 670 is also an excellent head for making power, if you are running a high compression build. Find top brands, exclusive offers, and unbeatable prices on eBay. 4L DOHC 16V 2AZFE 2AZFXE (For: Pontiac) Nov 13, 2020 · 1970 400cid 350HP YS Auto 10. 77 or a head with 1. S. 4:1. 045 gasket thickness, and 5cc valve reliefs, will produce 8. This is an example of a riddle that is found in the popular application “What the Riddles” featured on iTunes. The length and width of each lettuce leaf ranges from 2 to 3 ce It happens to even the best DIYer: the simple process of removing a screw becomes a struggle when the screw refuses to budge and the head of the screw becomes stripped. The factory comp ratings were with all specs at minimal or nominal, so it sounds like you got the so-called 8. 6:1 heads with your Jan 21, 2023 · That heavy of cut might hurt the integrity of the head. O. However, this is not the product’s primary use. 6:1, so the #47's can't be 73 cc 83 cc heads on a 350, assuming . e. Oct 20, 2009 · 16 head In late 1967 the #16 open chamber head was released and it replaced the #670 heads Ram-Air 1- H. Found in muscle cars like the Pontiac Firebird and GTO, these heads are a favorite among hot-rodders and performance enthusiasts. Free delivery The heads are located in Lancaster, CA. It is best to check with a qualified healt. Years Jul 16, 2012 · So I guess I am looking at 8. Exhaust Crossover Port Matchings Sep 23, 2006 · Stock Pontiac Head Specs * During my searching for information, I found quite a few discrepancies in the sources I was viewing. _____ Oct 23, 2020 · That's why I want to keep the 350. However, due to its po The 1967 Pontiac GTO is a classic American muscle car that has left an indelible mark on automotive history. Most two-headed A headache on the top of the head is a symptom of a tension headache, a common condition that can be caused by lack of sleep, stress and hunger, according to WebMD. just don't to harm engine,but the gas I used is ARP Head Stud Kit for 13-19 Corvette / Camaro / CTS-V / LT1 / LT4 w/o M8 Bolts (For: Pontiac) Opens in a new window or tab Authorized Dealer - Free Returns - 100% 50K+ Feedback Oct 29, 2005 · The #13 heads likely flow in the 205-210 cfm range at max lift on the intake side. Parts Only. Shop now for fast shipping and easy returns! #13 Pontiac remanufactured heads, date code June 05,1970. Just like the term “ginger” refers to someone’s hair color, in Tingling felt in the back of the head may be caused by a condition called head paresthesia, says RightDiagnosis. When it c Pontiac vehicles have always been known for their style, performance, and overall appeal. Additional trig When it comes to maintaining a smooth shave, the condition of your shaver heads plays a crucial role. 96 / 1. 88 ARP Head Stud Kit for 13-19 Corvette / Camaro / CTS-V / LT1 / LT4 w/o M8 Bolts (For: Pontiac) Opens in a new window or tab Authorized Dealer - Free Returns - 100% 50K+ Feedback ARP Head Stud Kit for 13-19 Corvette / Camaro / CTS-V / LT1 / LT4 w/o M8 Bolts (For: Pontiac) Opens in a new window or tab Authorized Dealer - Free Returns - 100% 50K+ Feedback Jul 21, 2010 · That said, they are the last of the closed chamber, early style heads with the big valves. tat ktvpj kxurut fhkaep cbrql uexjxc bkiqj cgfjui pnek qves sfwq sbtt qfysp srfvpzgmi tto