How to identify camel hump aka double hump small block chevy heads. Screwin rocker studs chevy sb 400 steam holes pushrod guide plates manley valve guides condition. The double hump or fuelie heads have been around since the 1960s. Ict billet sbc lwp alternator bracket double hump heads. Buick, chevy aluminum 10 degree heads, 235 cc intake ports. The later drilledtapped heads have a totally different casting design on each end.
The block casting number on small block and big block chevrolet v8 motors is located on a ledge found at the rear of the block, most often on the drivers side. Camel hump heads, adding accessory bolt holes chevy message. Development of streetworthy power parts for the gen i chevy. These heads achieved notoriety during the heyday of super stock drag racing when porting was not allowed. They are the rare 186 castings that have the accessory bolt holes and 64 cc chambers. Just to make things interesting, another casting, the 041, was basically the same as the 186 heads, but did not have the camel hump casting symbol. This kit is designed to work with double hump heads that came without accessory holes. Both were used between 6466 on the 327cid and had 64cc chambers. Im building a 350 with camel hump heads off 66 corvette, im wondering what to do without drilling accessory holes in the heads. Chevy 461 double hump cylinder head comparison tech talk step back in time with our modern reproduction of the iconic chevy 461 double hump cylinder heads, now cast in lightweight aluminum. Check out these chevrolet doublehump cylinder heads and youll find out why most are the same but not equal. I relocated the outerupper bolt inward about 34 because it was originally way out on the end of the head. Sbc alternatorpower steering pump accessory drive bracket kit for double hump heads, 551576. Dec 09, 2017 75 nova with ported camel hump heads, stainless 2.
In the late 60s they would have tapped holes in the ends of the heads. They are still a good casting and way better than an old set of open chamber 882 or 993s. Circle track racers were tossing their double hump heads as fast as they could buy the. Allnew trick flow heads emulate iconic sbc 461 fuelie castings. The cylinder heads used on high performance engines and some others of the era were the 3782461x head with 1. Nos genuine gm accessory right front chrome bumper guard 1973 chevrolet 6273796 fits. Made from premium grade, lightweight a356t61 aluminum, dhc 175 heads feature the. It features the latest high tech 64cc chambers and rightcast 220cc runners to produce a combination of excellent flow and high velocity. For the record, you can put a pair of stock vortec heads on casting number 062 or 906 and youll net 40 hp without anything else. Guide to chevy smallblock production heads chevy diy. They were used from 68 through 72 on 302 ci z28 engines as well as 70 through 72 in lt1 350 ci corvettez28 engines. Double hump heads chevy message forum restoration and.
Nov 03, 2016 on the outside, the heads have the original double hump stampings and styling with drilled accessory holes and straight plugs for the nostalgia look. Heads with short doublehump casting marks were used in later highperformance sbcs. Besides measuring the valves themselves you can also tell their size by the casting numbers. Chevy iron cylinder heads 3782461 multiple date codes. Heads with tall casting marks were identified as 291, 461, 461x and 462 castings and did not have accessory bolt holes. Heads with short double hump casting marks were used in later highperformance sbcs.
With highflow ports and standard intake valves, motown 220 heads are the ideal complement to large displacement small blocks 383 ci and larger. The chevrolet smallblock engine is a series of v8 automobile engines used in normal production by the chevrolet division of general motors between 1954 and 2003, using the same basic engine block. I have to go with buzz on this, when i was a teenager it didnt get more high tech than doublehumps as computer and flow benches increased in quantity and quality it was found these werent as magical as thought, even before that i know the big names like grumpy was doing so much work on them to make them work they didnt even resemble humpheads anymore. Nov 29, 2008 how to identify camel hump aka double hump small block chevy heads. Alternator and power steering bracket kits free shipping on. The edelbrock 2116 intake manifold will bolt right up and retain yo. Sbc accessory drive bracket kit for double hump heads. Comparing cylinder heads and fasteners for chevy small block engines. These heads had no accessory mounting bosses and bolt holes. I have to go with buzz on this, when i was a teenager it didnt get more high tech than double humps as computer and flow benches increased in quantity and quality it was found these werent as magical as thought, even before that i know the big names like grumpy was doing so much work on them to make them work they didnt even resemble hump heads anymore. Gm 24 head casting date code is f 19 4june 19, 1974 this head is in place on the passenger side with the 3 accessory holes facing the gm 37 head casting date code is f 5 7june 5, 1977 this head is in place on the drivers side with the 3 accessory holes facing forward. From 1964 through 1968, some, but not all, doublehump heads had 2. There were double hump heads such as symbol h in 69later, but those heads had additional raised bosses and threaded holes for attachment of accessory brackets such as for the alternator. Some of the small brackets that mount to the headers are weak and do break if you have a fairly hot cam.
Chevy sbc assembled aluminum camel double hump 461. Power pulleys free delivery possible on eligible purchases. If there was another size, that info has long since left my mind. Camel hump heads, adding accessory bolt holes 092106 02. Chevy v8 sbc block and head casting numbers chevy v8 bbc block and head casting numbers chevy v8 w motor 348409 casting numbers chevy v8 crankshaft casting numbers chevy v8 crankshaft journal sizes chevy v8 bore and stroke list chevy v8 notes sbc crate motors bbc crate motors sbc cylinder heads holley carb information holley tuning tips. I have a late model block that i am rebuilding and it has the lower holes drilled. The early heads dont have this nor enough material to provide enough thread engagement. My engine block is stamped vo316trj its out of a 1972 34 tonc20. The hump markings on the end of the heads of double hump or camel hump heads will vary slightly with the size of the valves. Check out the details, modifications, and tests we run on various types of heads, all. Check out the details, modifications, and tests we run on various types of. Double hump head id in 1962, chevy came out with the double hump heads with 1. G leftfacing right triangle 041 6970 350300hp, accessory bolt holes, most have 1. Engine block and heads casting numbers engine block casting numbers.
Buy ict billet sbc lwp alternator bracket double hump heads adjustable billet kit small chevy. Doublehump heads from trick flow give modern performance. I drilled the holes in the heads to mount the bracket. Referred to as a smallblock for its comparative size relative to the physically much larger chevrolet bigblock engines, the family spanned from 262 cu in 4.
I dont know where you are getting those head numbers from, but they sure aint double hup head casting numbers. Chevy double hump cylinder heads brzezinski racing. Check out these chevrolet double hump cylinder heads and youll find out why most are the same but not equal. Aug 30, 2009 check out these chevrolet double hump cylinder heads and youll find out why most are the same but not equal. The standard 461 heads intake port volume was 161cc, exhaust was 62cc. I want an electric fan set up and i dont really need the ac is there a car that i can swap my accesories and belt routings to, or can i buy brackets that bypass the heads. Which is better accessory hole double hump heads like the 461, 462 and 291 or the later heads with accessory holes like the 186 and 492. Chevy double hump cylinder heads brzezinski racing products. Double hump heads, no accessory holes 160 cc runners. The x castings had the same port configuration, but had larger port volumes, they do not have accessory holes. Sbc lwp alternator bracket double hump heads adjustable.
Sbc 186 casting fuelie heads for sale the bangshift. The 041 heads have a completely different right angle symbol on their ends. This simple bracket cured our alternator mounting issues with double hump heads wout accessory bolt holes. Chevy double hump heads 3927186 6970 corvette pair of bare chevy double hump heads part number 3927186 these are the double humps with accessory holes, just back from machine shop diagnosis is they need new guides installed, or oversized valves. Actually, there are four part numbers for this cylinder head. Camel hump,no accessory holes,larger 17264cc port volumes, 62cc chamber 37958966365. I am wondering what they would do for a stock 283 with 600 cfm and perhaps a 3030 solid lift cam over the stock 283 heads. Ict billet sbc alternatorpower steering pump accessory drive bracket kit for double.
With a coat of chevy orange paint, youll have everyone convinced youre running an original set of 461 double hump heads. Chevy small block cylinder head identification guide key cast marks cast nos. Even the older performance double hump heads are now considered passe. The very first year for a double hump head was 1961 315hp283 fuel injected corvette only. In 1962, chevy came out with the double hump heads with 1.
That is a descent little set of heads all though out dated by most new heads. In this video, joe and wyatt discuss the features that. I think those 186 castings are the small double hump heads that came with the accessory bolt holes. On the outside, the heads have the original double hump stampings and styling with drilled accessory holes and straight plugs for the nostalgia look. Camel hump heads, adding accessory bolt holes 092106 09.
Chevy iron cylinder heads 3782461 multiple date codes meadow. The double hump heads pre 69 didnt have the bosses cast on the heads. It has double hump heads, no accessory bolt holes, 194 intakes. Sbc cylinder head casting numbers end in 462, according to the books. How to identify camel hump aka double hump small block. I know it sounds hypocritical to run a camel humps and an alternator but it will be under the hood of 55 chevy so the non traditional sins will be hidden along with the mallory dist. Note that these early double hump heads didnt have accessory bolt holes, which often makes them unsuitable for upgrading newer lowperformance engines. Sbc alternatorpower steering pump accessory drive bracket kit.
Ict billet sbc alternatorpower steering pump accessory drive. Alternator and power steering bracket kits free shipping. Could be used on a 305 but no accessory holes and has unhardened exhaust seats. No longer will fans of the small block chevy have to choose between vintage looks or modern cylinder head powertrick flows dhc 175 cylinder heads give you both. Nov 26, 2011 you have been given accurate info about casting numbers. Dec 15, 2009 heads that came on the block im using and was planning on using are. Comparing cylinder heads and fasteners for chevy small.
Sbc cylinder head identification crankshaft coalition wiki. The intake port on the x casting was 172ccs, and the exhaust port was 62ccs, valve sizing was 1. Since then, the price from gm has risen steadily, but as this book is written, the. Camel hump heads, adding accessory bolt holes chevy. The first double hump heads had no accessory holes, because the brackets were mounted to the block or water pump. All tonawanda engine component castings will have a t cast into the surface of the part to designate it as a tonawanda casting.
Take note that these heads have no accessory bolt holes for the front drive just like original 461s. Turbo head makes its mark as the double hump heads started showing up on more chevy products and losing favor with some performance smallblock owners because of aftermarket swaps, a loyal. You are welcome to use this kit or our 551476, which uses the accessory. Sbc accessory drive bracket kit for double hump heads part. Chevrolet doublehump cylinder heads circle track magazine. Yes they do not require accessory bolts in head mount only to the water pump. Early chevy smallblock cylinder heads did not have accessory mounting holes on the ends of the head.
These were made in 69 and 70 only used on 302s, lt1 350, and 300 hp 350s. Dec 26, 2005 the problem is the double hump heads are 40 yrs. Trick flow dhc 175 cylinder heads for small block chevrolet. Later models were designed for use with accessory brackets that mount to the heads. All cylinder blocks, cylinder heads, and cast iron intake manifolds cast in saginaw, michigan, for the flint, michigan engine assembly plant would have a singledigit year date code. Vintage bumpers for chevrolet caprice for sale ebay. Sbc alternatorpower steering pump accessory drive bracket. Nov 06, 2011 chevy 350 with no accesory holes in heads. Ive read this book from cover to cover at least a dozen times. Some of these heads had accessory mounting holes, but heads made before 1969 do not.
Beginning in 1969, chevy added accessory holes to the front of all its cylinder. These early heads did not have accessory bracket bolt holes. Reading some of frans replies on the 348 and 409 engine forum got me thinking again about the double hump markings on my 65 327275 and a few others that i have noticed thru the years. Accessory hole double hump heads which head to run youtube. It does require you to swing the alternator 180 degrees so that the adjustment bolt is on the bottom instead of the top as you face the engine. Designed for small block chevy with double hump heads and long water pump. Comparing cylinder heads and fasteners for chevy small block. Accessory drive bracket double hump heads 305 327 350 383 5. There were double hump heads such as symbol h in 69later, but those heads had additional raised bosses and threaded holes for attachment of. Most of these heads had accessory bolt holes and were identified with casting numbers ending in 186 or 492. Except for some early truck applications, it was not until 1969 that all smallblock heads had factoryequipped accessory holes. Ict billet alternator brackets 551672x summit racing. World products motown 220 clearly rates as the ultimate small block cast iron head. Made from premium grade, lightweight a356t61 aluminum, dhc 175 heads feature the exterior styling and straight spark plug holes that deliver the nostalgic appearance of the original factory performance 186, 291,461,462 double hump or camel back castings that customers want.
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