Camel hump heads - item 5 OEM GM 3782461 Cylinder Heads Small Block Chevy Camel Hump 1965-66 2.02 1.60 OEM GM 3782461 Cylinder Heads Small Block Chevy Camel Hump 1965-66 2.02 1.60. $800.00 +$110.00 shipping. item 6 Matched Pair 3890462 SMALL BLOCK CHEVY FACTORY HIPO DOUBLE HUMP CYLINDER HEADS.

 
3991492. Jump to Latest Follow. 30K views 10 replies 7 participants last post by 2drpostL79 Aug 23, 2009. G. gregmontgomery Discussion starter. 203 posts · Joined 1999. #1 · May 18, 2009. can anyone give any info. on these heads .3991492 is the numbers are these good performance heads.thanks. Like.. Ingles bakery cakes

Re: Camel Hump Heads, adding accessory bolt holes 09-21-06 03:47 AM - Post# 1005698 In response to impalex I really don't think drilling a set of early heads would be a good idea. The later drilled/tapped heads have a totally different casting design on each end. I have an early set of heads like yours on my El Camino.Compatible with Camel Hump/Fuelie Heads Includes Grade 8 Hardware Pump Rotation : Standard (Not Included) Reverse Rotation (Included) Reverse Rotation (Included) Standard (Not Included) Standard (Not Included) Product information . Technical Details. Manufacturer ‎CVF Racing ...General Motors identifies its small-block Chevy cylinder heads with both casting numbers and casting marks. "Double-hump" heads were found on many of its high-performance engines in the 1960s and early 1970s. They were manufactured with larger intake and exhaust port volumes and valves for the period, and engines equipped with them had …steve70malibu. According to my information, 461X was the best of all the camel hump heads but are very rare. Next comes the 492 castings, next the 461, then 186, then 041s which are not camel humps but have the same design. I have a print out from a website that lists all sb heads and information on all of them.There is a company out there that makes aluminum heads with the old double hump casting on the ends. Might be worth looking into. 1969 x-77 Z/28 orange/ white stripes, named by my daughter "Clementine ", M-22 close ratio, 4:10 12 bolt, CE 302. Hugger orange with white stripes.Chevy Camel Hump Heads. howaus_mw3a7d5 (7) Seller's other items Seller's other items; Contact seller; US $2,600.00. No Interest if paid in full in 6 mo on $99+ with PayPal Credit * ... Cylinder Heads & Parts for Chevy, Cylinder Heads & Parts for Chevrolet Chevy II, Engines for Chevy,Step back in time with Speedway Motors’ modern reproduction of the iconic Chevy 461 double-hump cylinder heads, now cast in lightweight aluminum. Also known as “fuelie” heads, the 3782461 castings were used on many legendary Chevrolets from 1961-1967. Their all-new cylinder head casting is a modern take with all the old-school looks …Camel Hump Heads. High performance heads by Chevrolet, identified by two humps on the outside end of the casting.The phrase “Camel Hump” or “Double Hump” heads comes from this casting boss with the two ears or bumps. These heads are some of the best factory heads ever produced. The L84 is essentially the exact same engine as the L76, but with Rochester mechanical fuel injection.The original heads used on the L79 are the same as the L76 and L84, the famed “Camel Hump” 461 castings with 2.02”/1.60” valves. Keep in mind that most 461 double-hump heads have 1.94”/1.50” valves, only the select few used on L79, L76, and L84 engines had the larger valves.Because camel humps store food, the dromedaries need other ways to cope with water scarcity. For example, camels can can drink up to 30 gallons (114 liters) of water in one sitting, they excrete ...The “double hump” or “fuelie” heads have been around since the 1960’s. They are still used in a variety of applications. We have a good supply of used ‘186 & ‘492 heads available with everything from “ Undercover Porting ” to CNC Sportsman Porting. Stock “double hump” heads flow 202 cfm intake and 141 cfm on the exhaust.ARP 247‑4202 Head Stud Kit for 1998-18 Dodge Cummins 24v Diesel 5.9L 6.7L. Find many great new & used options and get the best deals for SBC 3927186 186 1969 Camel Back Camel Hump 300hp or 350hp Heads at the best online prices at eBay! Free shipping for many products!Re: 350 block 461 camel hump heads 11-25-04 06:02 AM - Post# 560210 In response to raws67 Hi..those heads are probably closer to 64 cc. This where it gets sticky..I was doing the same thing. I ended up with over a grand into a set of 186 heads. If you have the heads surfaced,new seats,new valves and springs and keepers, you will be over 350 …ARP 134-3601 Head Bolt Kit - Chevrolet Small Block. (85) $87.06 New. ---- Used. Find many great new & used options and get the best deals for Camel+Hump+Heads+Casting+492+%26+292 at the best online prices at eBay! Free shipping for many products!Chevy 3917291 Heads 302 327 350 Double Hump Pair Camel Hump SBC Heads 291 D 10 7. Opens in a new window or tab. Pre-Owned. $700.00. delcoenginesandcomponents (230) 100%.Mar 2008. Posts. 952. i think a lot of people that think that the camel humps are better simply because they flow more air or make more peak horsepower need to look at the bigger picture. the vortecs are more efficient over a broader rpm range, and require less timing and octane to get the job done.Unless your doing a restoration that requires camel humps your better off with aftermarket heads. Even a set of mildly worked vortec heads are better than camel humps. I would go with the Dart heads. You'll be much happier. Heads have advanced incredibly since the 60's. 71 Nova - LQ4/4L80E, 12 bolt posi 4.11 rear - SOLD.UPGRADED SBC Camel Hump Cylinder Heads 461 STAINLESS VALVES HARDENED SEATS. Opens in a new window or tab. New (Other) $1,199.99. streetrodshq (6) 100%. or Best Offer +$199.99 shipping. New Listing SBC Double Hump Camelback Head 1966 Corvette Chevy 461 Casting 1.94 62cc. Opens in a new window or tab.Camel hump heads are way over rated in this day and age. You could gain a little more power from them by porting and cleanup. I ported my Sportsman IIs using a high speed steel cutter on a Dremel tool. It took forever, but it worked. I guess it depends on how confident you are with a Dremel.-You could take the sharp edges off of the short turn ...Feb 28, 2020 · Chevy SBC V8 Bare Aluminum Camel Double Hump 461 Cylinder Head - https://www.speedwaymotors.com/Chevy-SBC-V8-Bare-Aluminum-Camel-Double-Hump-461-Cylinder-Hea... the 400 has about 10.4:1CR with #187 camel hump heads, weiand intake and a new Holley 750 DP, forged pistons, a fairly radical cam (well we were told, I've heard it run for about 1min till next weekend) mini gear reduction starter, hooker headers, 3" exhaust, 4 core radiator, lakewood scatter shield , dual center force clutch, and the M21 and ...7793 posts · Joined 2001. #2 · Dec 26, 2007. The camel back heads only have about 160 cc intake ports. For a 383 200cc seems about right. I have heard of 180cc heads giving outstanding results. Your 462 heads were awesome in the 60's and 70's even the vortec heads will out perform them now.The “double hump” or “fuelie” heads have been around since the 1960’s. They are still used in a variety of applications. We have a good supply of used ‘186 & ‘492 heads available … Even older is the troglodyte-like 64-cc chamber heads, often referred to as “double hump” or “camel hump” heads because of their distinctive casting marks on the ends of the heads. These smaller chamber heads had better flowing ports than the later 441 or 882 castings. Camel Hump Heads. High performance heads by Chevrolet, identified by two humps on the outside end of the casting.Step back in time with our modern reproduction of the iconic Chevy 461 double hump cylinder heads, now cast in lightweight aluminum! In this video, Joe and Wyatt discuss the features that bring the vaunted camel hump heads into the 21st Century.The car was gutless with the stock 283, and I expect it to be somewhat less gutless after the rebuild. Heads #1 - Stock rebuilt 1967 283 Powerpack heads with a good valve job and upgraded springs, +/- 60 CC chambers. Heads #2 - TFS Camel hump heads 2.02/1.60 valves, 175 CC runner, 60 CC chambers.1969 -70 camel hump 2.02 heads. $650. Hobbies › Car Engines & Parts. Listed 3 days ago in Hardin, MT. Message. Message. Save. Save. Share. Details. Condition. Used - like new. 1969-70 camel hump 2.02 heads, fresh machine and valve work, updated seats , 3927186, great for and old school purist build…$650 obo. Hardin, MT.3782461 327, 64-66 Double humpers or Camel hump 161/62cc port 3782461X 60-63, Larger intake runners, 172/64cc port 3991492 350 LT1, 70, 64cc, straight plug, camel hump 3991492 Over counter, strt or angle plug, 64cc, 157/62cc ports ... the larger valved and pocket ported ‘Camel Hump’ style heads are just fine. ...Features like fast-burn combustion chambers, high-velocity ports, large diameter valve springs, and positive stop valve seals bring the vaunted camel hump heads into the 21st Century. Save yourself the hassles of hunting down original GM 3782461, 3782461X or 3890462 castings, only to find out they can't be saved.Sorry 462 camel hump casting hoarders, Trick Flow is bringing back an aluminum version of the classic camel or double hump heads for the Chevrolet small block. If you are not familiar with the ... ARP 250-4202 Ford Diesel Head Stud Kit. $526.59. Trending at $549.00. Find many great new & used options and get the best deals for Camel+Double+Hump+Heads+Cylinder+GM+Casting+3917291 at the best online prices at eBay! Free shipping for many products! Learn about the differences and performance of two popular part numbers of Chevy's double-hump cylinder heads, used in racing and street cars. See how they measure up on the flow …One-humped and two-humped camels are two entirely different species. The two-humped species is the Bactrian camel, while the one-humped species is the dromedary. Bactrian camels ar... item 7 OEM GM 3782461 Cylinder Heads Small Block Chevy Camel Hump 1964 2.02 1.60 Fuelie OEM GM 3782461 Cylinder Heads Small Block Chevy Camel Hump 1964 2.02 1.60 Fuelie $895.00 +$88.85 shipping ARP 247‑4202 Head Stud Kit for 1998-18 Dodge Cummins 24v Diesel 5.9L 6.7L. Find many great new & used options and get the best deals for SBC 3927186 186 1969 Camel Back Camel Hump 300hp or 350hp Heads at the best online prices at eBay! Free shipping for many products!Camel back, double hump,fuelie heads, are all names for 461,462 & 291 head castings, and I think they WILL work on a 305. If I'm not mistaken, they would lower your compression ratio, though. I think 305 heads have 58CC combustion chambers, and the above named heads have 62-65 CC combustion chambers. I woud imagine that the intake runners on ...The #462 has got the normal approx. 64cc chamber and the #461 (x) has got a bit smaller one with approx. 60,5cc. Just as Scooter said. So with the same pistons you get more compression (=power or problems... with the #461 (x) heads. Bryan, you said you´ve got #292 heads there.Hello, I have the following: 462 camel hump heads. 355 C.I. small block chevy. flat top pistons, 10:1 compresion ratio. camshaft: 106 degree LSA, 250 degree duration at .050". 165-180 cranking PSI in all cylinders. Quadrajet, stock intake, exhaust and heads, no porting (it is on a circle track street stock and those are the rules).item 8 OEM GM 3782461 Cylinder Heads Small Block Chevy Camel Hump 1964 2.02 1.60 Fuelie OEM GM 3782461 Cylinder Heads Small Block Chevy Camel Hump 1964 2.02 1.60 Fuelie $895.00 +$88.85 shippingthe 400 has about 10.4:1CR with #187 camel hump heads, weiand intake and a new Holley 750 DP, forged pistons, a fairly radical cam (well we were told, I've heard it run for about 1min till next weekend) mini gear reduction starter, hooker headers, 3" exhaust, 4 core radiator, lakewood scatter shield , dual center force clutch, and the M21 and ...A hump on the upper back between the shoulder blades is an area of fat accumulation on the back of the neck. The medical name of this condition is dorsocervical fat pad. A hump on ...Step back in time with our modern reproduction of the iconic Chevy 461 double hump cylinder heads, now cast in lightweight aluminum! In this video, Joe and Wyatt discuss the features that bring the vaunted camel hump heads into the 21st Century.202 camel hump heads. I was really leaning toward a set of aluminum heads, but my cousin called and said he had a set of 202 camel hump heads off his 327. He has roller rockers to go with them. The 327 is dead and now he has a LT-1 which he is putting into his 67 camaro. I currently have a mainly stock 350 with 882 76cc heads (i …Even older is the troglodyte-like 64-cc chamber heads, often referred to as “double hump” or “camel hump” heads because of their distinctive casting marks on the ends of the heads. These smaller chamber heads had better flowing ports than the later 441 or 882 castings.28 posts · Joined 2008. #1 · Dec 18, 2008. I've got a bare set of camel hump heads with casting number 3782461 and 1.94 valves. They are not drilled in the front for brackets and have no cracks. I bought these heads in 1987 for a song and I've kept them for all this time planning to use them one day. I keep reading about all the great …Original Camel Hump Heads. I just finished up machining two sets of heads for a customer replicating camel hump heads for a Camaro restoration. He wanted high performance heads that looked just like the originals. I machined the logos off and then machined the inset by hand around a 3/8” thick steel guide. After the rough machining was ...Dear Lifehacker,item 7 OEM GM 3782461 Cylinder Heads Small Block Chevy Camel Hump 1964 2.02 1.60 Fuelie OEM GM 3782461 Cylinder Heads Small Block Chevy Camel Hump 1964 2.02 1.60 Fuelie. $895.00 +$88.85 shipping. See all 10 - listings for this product. 5.0. 5.0 out of 5 stars based on 1 product rating.Vortex intercepts high-grade silver with goldNew target discovered east of BrimstoneCentral and Camel zones convert waste to mineralizationWINNEMU... Vortex intercepts high-grade s...Back to your original question, most people call the "camel hump" heads fuelies but as stated before, only the 461 were true fuelies. There are several closed chambered heads with different casting numbers and markings that will perform as well and a original fuelie head. You need to get the last 3 numbers from the casting numbers and look them up.H-Small “camel hump” c/n 186, 492. Later high performance or “fuelie” heads, some c/n 186 (1969 and later) and all c/n 492 have accessory bolt holes. Either 1.94" x 1.50" or 2.02" x 1.60" valves, 64cc nominal chamber volume. 1970 LT-1/Z-28 use c/n 186. I-Large triangle over rectangle (“crown”) c/n 882. Large chamber (76 cc nominal ...In this video, Joe and Wyatt discuss the features that bring the vaunted camel hump heads into the 21st Century. Speedway Tech Talk - Aluminum Cylinder Heads for 348-409 Chevys. Read More. Tim shows off our aluminum cylinder heads for 348-409 Chevys. Chevy 454 Big Block Budget Build: Recipes for 400-600 HP.Based on the iconic “double-hump” or “camel-back” (fuelie) cylinder heads of the ‘60s and early ‘70s—including the famed 461 Fuelie heads—the DHC 175 castings are modern aluminum versions with …Step back in time with our modern reproduction of the iconic Chevy 461 double hump cylinder heads, now cast in lightweight aluminum! Also …There are a lot of castings to choose from when running the Chevy Double Hump heads. In this video we discuss what is the best casting to start with for you...Chevy Small Block Alternator Bracket - Fuelie or Camel Hump Heads with Long Water Pump (LWP) (283, 302, 327, 305, 350 & 400 CID) Mid-mount Chevy small block alternator bracket for V-belt applications with Fuelie heads that do not have bolt holes in the front of the cylinder head. Designed for use with OEM or CVF Racing pulleys.Researchers have discovered abundant colonies of mycobacterium in residential shower heads. HowStuffWorks takes a looks and offers a quick fix. Advertisement Taking a shower should...item 7 OEM GM 3782461 Cylinder Heads Small Block Chevy Camel Hump 1964 2.02 1.60 Fuelie OEM GM 3782461 Cylinder Heads Small Block Chevy Camel Hump 1964 2.02 1.60 Fuelie $895.00 +$88.85 shippingT. techinspector1. 18069 posts · Joined 2005. #2 · Nov 3, 2006. "492" – 3991492. Good performance head. They were found on 1970 LT-1 engines. They had 2.02/1.60" valves, 64CC combustion chambers, DO have accessory holes, intake port volume should be 161CC's, exhaust port volume should be 62CC's. These heads have …Hello, I have the following: 462 camel hump heads. 355 C.I. small block chevy. flat top pistons, 10:1 compresion ratio. camshaft: 106 degree LSA, 250 degree duration at .050". 165-180 cranking PSI in all cylinders. Quadrajet, stock intake, exhaust and heads, no porting (it is on a circle track street stock and those are the rules).Hello, I have the following: 462 camel hump heads. 355 C.I. small block chevy. flat top pistons, 10:1 compresion ratio. camshaft: 106 degree LSA, 250 degree duration at .050". 165-180 cranking PSI in all cylinders. Quadrajet, stock intake, exhaust and heads, no porting (it is on a circle track street stock and those are the rules).There are a few things to consider. The valve sizes and chamber volume are two. If they have 1.94" intake and 1.5" exhaust valves a 383 would probably benefit from 2.02" intakes and 1.6" exhausts. A lot of these heads had 64cc chambers and a 383 with flat top pistons will put the compression over 11:1. If you're running pump gas on the …For port matching your intake and heads, you can find your ideal intake manifold gasket to use as a template. Holley Performance/Mr Gasket offers this port gauge I use with 28 popular port sizes for small- and big-block Chevy heads. The hard plastic material makes scribing your heads easier. The Tools Basic head-porting tools will not break the ...Based on the iconic “double-hump” or “camel-back” (fuelie) cylinder heads of the ‘60s and early ‘70s—including the famed 461 Fuelie heads—the DHC 175 castings are modern aluminum versions with straight spark-plug locations and improved 60cc combustion chambers.Accessory holes in the heads did not come about until 1969. This was also the first year of the long style water pump. If you keep everything stock on your 1967, it is all stock parts for a '67 with the "short" water pump. Many parts houses can set you up with what you need. 69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI ...item 5 OEM GM 3782461 Cylinder Heads Small Block Chevy Camel Hump 1965-66 2.02 1.60 OEM GM 3782461 Cylinder Heads Small Block Chevy Camel Hump 1965-66 2.02 1.60 $800.00 +$110.00 shippingChevrolet Small Block Camel Hump Heads (Small Camel Humps) In this video we get a tad bit confused over the Casting Numbers Watch me struggle to figure this ... item 5 OEM GM 3782461 Cylinder Heads Small Block Chevy Camel Hump 1965-66 2.02 1.60 OEM GM 3782461 Cylinder Heads Small Block Chevy Camel Hump 1965-66 2.02 1.60 $800.00 +$110.00 shipping I have heads stamped with # 378241. And a build code of B266. I know these are camel hump heads built on February 26, 1966. My question: what were the stock valve sizes on these??? My understanding is that the "-461" had the bigger 2.02/1.60 valves AND the "-461X" had the smaller 1.94/1.50 valves. Please impress me with your old school ...They actually ran very well. The 327-300 engine used the double hump heads, with larger 1.94" and 1.5" valve size, larger port intake manifold with larger Carter AFB carb, and larger dump ram's horn exhaust manifolds. The basic shortblocks of the two 327s were basically the same. More than likely your block number is 870.Dec 12, 2018 · Originally sold bare, so valve sizes are dependent on machining. All 400ci small-blocks utilize Siamese cylinder walls. This design caused the cooling system to develop hot spots and that is why the 400 heads have steam holes. 25534351C: 2004 Bow Tie, cast-iron, Vortec, 175cc intake ports, 65cc exhaust ports, 2.02/1.55-inch valves. SBC Camel Back / Double Hump / Fuelie Cylinder Heads and Roller Rockers These Camel Back iron cylinder heads came off of my running 327. I just swapped for a new set of aluminum heads for more power and less weight. Overall, the heads are in great shape and there are no problems with them that I'm aware of - but, as with any …Learn about the new aluminum double hump cylinder heads for the small block Chevy V8 that offer improved performance and vintage look. See how they differ …Because camel humps store food, the dromedaries need other ways to cope with water scarcity. For example, camels can can drink up to 30 gallons (114 liters) of water in one sitting, they excrete ...There are decent heats, rather a return to the old dual quench, camel hump head. Not as power making as the L31 Vortec head of 1996-2002 but a pretty decent head for seekers of top end horsepower. What you need is the engine builds and partial VIN codes off the right front of the block between the head and the coolant pump. item 7 OEM GM 3782461 Cylinder Heads Small Block Chevy Camel Hump 1964 2.02 1.60 Fuelie OEM GM 3782461 Cylinder Heads Small Block Chevy Camel Hump 1964 2.02 1.60 Fuelie $895.00 +$88.85 shipping

the 462 and pretty much all the following camel hump heads had the D shaped chamber, and the spark plug location was moved with a large quench pad adjacent to it....these are the heads to use if you are going to run domed pistons, the 461's usually have some interference with domes and spark plugs. 461 View attachment 204412 462 …. Missed a toll in illinois

camel hump heads

Jun 11, 2023 · Camel Hump head porting and setup. by postal123 » Sun Jun 11, 2023 5:24 pm. Gents, I'm just a hobbyist and this is my 2nd thread here and 2nd attempt at head porting. I bought a '65 K10 with 8k "rebuilt" 357 SBC. Flat top 4-eyebrow pistons, HFT cam measured 252/262, 202/214 109 ICL and 114 LSA. 492 angle plug heads, performer intake with 600 ... 3991492. Jump to Latest Follow. 30K views 10 replies 7 participants last post by 2drpostL79 Aug 23, 2009. G. gregmontgomery Discussion starter. 203 posts · Joined 1999. #1 · May 18, 2009. can anyone give any info. on these heads .3991492 is the numbers are these good performance heads.thanks. Like.(Kitco News) - Kitco aficionados, it is now time to have your say in where you think gold prices are heading in the short-term.Read more on 'Kitco' Indices Commodities Currencies S...SBC camel hump heads. Jump to Latest Follow ... I wanted to sell the heads sperate . The casting numbers are 327186 and 3782461. Mortec says the first is 69/70 302/350 64cc and the other is 64-66 327 with 62cc These heads have Manley 2.02/1.60 valve and guides, new springs, and seals, but don't know what they are. ...The double hump or "camel hump" casting marks can be found on a variety of small-block iron heads and designate a high-performance casting. Many heads with the double-hump mark were...Heads made to run 1.94 and 2.02 intake valves are the same castings. The only difference between similar heads with 1.94 vs 2.02 valves is the size of the valve port itself (the intake passage is the same size!) and of course the valve itself. Heads with 1.94 valves can be easily modified to accept 2.02 valves by boring the valve seat to the ...Chevy SBC Assembled Aluminum Camel Double Hump 461 Cylinder Head made by Speedway Motors, for as low as $609.99. Talk to the experts. Call 800.979.0122, 7am-10pm, everyday.The most common heads sought by engine builders are ones identified variously as the "Camel Back," "Double Hump" or "Humper" heads used on a range of passenger cars and performance vehicles. Background. The small-block engine was manufactured by General Motors for Chevrolet and other GM vehicles from 1955 to 2002. It featured the following ...T. techinspector1. 18069 posts · Joined 2005. #2 · Nov 3, 2006. "492" – 3991492. Good performance head. They were found on 1970 LT-1 engines. They had 2.02/1.60" valves, 64CC combustion chambers, DO have accessory holes, intake port volume should be 161CC's, exhaust port volume should be 62CC's. These heads have …Heads made to run 1.94 and 2.02 intake valves are the same castings. The only difference between similar heads with 1.94 vs 2.02 valves is the size of the valve port itself (the intake passage is the same size!) and of course the valve itself. Heads with 1.94 valves can be easily modified to accept 2.02 valves by boring the valve seat to the ...item 8 OEM GM 3782461 Cylinder Heads Small Block Chevy Camel Hump 1964 2.02 1.60 Fuelie OEM GM 3782461 Cylinder Heads Small Block Chevy Camel Hump 1964 2.02 1.60 Fuelie $895.00 +$88.85 shippingUnless your doing a restoration that requires camel humps your better off with aftermarket heads. Even a set of mildly worked vortec heads are better than camel humps. I would go with the Dart heads. You'll be much happier. Heads have advanced incredibly since the 60's. 71 Nova - LQ4/4L80E, 12 bolt posi 4.11 rear - SOLD.They actually ran very well. The 327-300 engine used the double hump heads, with larger 1.94" and 1.5" valve size, larger port intake manifold with larger Carter AFB carb, and larger dump ram's horn exhaust manifolds. The basic shortblocks of the two 327s were basically the same. More than likely your block number is 870.3991492. Jump to Latest Follow. 30K views 10 replies 7 participants last post by 2drpostL79 Aug 23, 2009. G. gregmontgomery Discussion starter. 203 posts · Joined 1999. #1 · May 18, 2009. can anyone give any info. on these heads .3991492 is the numbers are these good performance heads.thanks. Like..

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