Double hump heads with accessory holes the book

Chevy sbc assembled aluminum camel double hump 461. I believe there is more than one double hump head casting. These heads achieved notoriety during the heyday of super stock drag racing when porting was not allowed. 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. The double hump heads pre 69 didnt have the bosses cast on the heads. Jan 01, 2001 we landed a set of complete camel hump chevy heads 1964 castings at the swaps with 1.

I would look into finding someone who wants the heads for a period correct resto and look for something that will do a better job of getting you the performance you want. If there was another size, that info has long since left my mind. Accessory hole double hump heads which head to run youtube. More performance and less expensive than rebuilding used heads. Ict billet sbc lwp alternator bracket double hump heads. Mar 24, 2012 i have a 355 with flat top pistons running 882 heads with a lunati 2219 duration. Sbc alternatorpower steering pump accessory drive bracket. This is a used set of camel hump heads for a small block chevy. These heads were the best flowing factory heads gm had to offer at the time.

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. They are easily identified by the double hump shape on the end of each head. 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. How to build a 400 horse chevy small block 350 it still runs. Reposition and secure components with ict billet alternatorpower steering bracket kits. You can tell by the threaded holes that these are later heads. Camel hump heads, adding accessory bolt holes 092106 03. One of the bolts line up but the second and third are off quite a bit. The early heads dont have this nor enough material to provide enough thread engagement. After 1969 these were made with accessory bolt holes and 64cc combustion chambers. I have a late model block that i am rebuilding and it has the lower holes drilled. How do you tell if a chevy has double hump camel heads. Doublehump heads from trick flow give modern performance and.

In fact, weve brought back classic chevy performance in a big way with these readytorun heads for small block chevy. The first doublehump heads had no accessory holes, because the brackets were mounted to the block or water pump. Even the older performance double hump heads are now considered passe. 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.

They have about 800 miles on them since they were redone. The double hump or camel hump casting symbol on the end of this head indicates a performance castiron head used in the 1960s. The easiest way to reference any production head is with the last three digits of its casting number. C vertical bar over rectangle 997 57 corvette 270hp, 9. Note the spark plug cooling holes were plugged before the angle milling. 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.

Chevy double hump cylinder heads brzezinski racing products. Doublehump heads from trick flow give modern performance. Beginning in 1969, chevy added accessory holes to the front of all its cylinder. This kit is designed to work with double hump heads that came without accessory holes. The most famous heads are the 461 and 462 heads that offer 160cc intake ports, 64cc chambers, and 2. As new castings are released on late models keep your eyes open for the new numbers.

Summit racing cast iron cylinder heads for small chevy sum. It features the latest high tech 64cc chambers and rightcast 220cc runners to produce a combination of excellent flow and high velocity. Guide to chevy smallblock production heads chevy diy. When there are no mounting holes, you need to use a short water pump with the factory brackets. Sr head application chart gifitem detailsstraight plug.

Could be used on a 305 but no accessory holes and has unhardened exhaust seats. The older heads like yours also uses a 16 wrenching, not the smaller 58 i would not run the accel plugs. The double hump or fuelie heads have been around since the 1960s. Looks like the smog head on the outside, but has racing head features like an extrathick deck, screwin rocker arm studs, and raised valve cover rails. Trick flow dhc 175 cylinder heads for small block chevrolet. Airflow numbers the first doublehump heads had no accessory holes, because the brackets were mounted to the block or water pump. The later drilledtapped heads have a totally different casting design on each end. Includes all hardware to attach bracket to long water pump and engine block. Sbc alternatorpower steering pump accessory drive bracket kit.

Right now we are limiting the listings to chevy v8 blocks, cranks and heads. Most of these heads had accessory bolt holes and were identified with casting numbers ending in 186 or 492. Before screw in studs became popular, lots of heads were drilled and pinned to keep the studs from pulling out. The famed camel hump or fuelie heads used until 68 had no accessory bolt holes and used 1. Aluminum gm 3782461 chevy 327 sbc camel back double. Besides measuring the valves themselves you can also tell their size by the casting numbers. Some of these heads had accessory mounting holes, but heads made before 1969 do not. They are crafted from aerospacegrade billet aluminum to provide the strength for a confident move. They were over the counter performance heads and were angle plug. In this video, joe and wyatt discuss the features that bring the vaunted camel hump heads into the 21st century.

The standard 461 head s intake port volume was 161cc, exhaust was 62cc. Cvertical bar over rectangle cn 997, 1957 corvette 270 hp, 9. Myself, when i was running 462 casting double hump heads, i modded my brackets to work. Ict billet alternatorpower steering bracket kits 551576. Heads with short double hump casting marks were used in later highperformance sbcs. Very few tech inspectors had even a suspicion of what was going on. Comparing cylinder heads and fasteners for chevy small block. You are welcome to use this kit or our 551476, which uses the accessory. Im looking at a book here and there is no 364434 casting. Buy ict billet sbc lwp alternator bracket double hump heads adjustable billet kit. The bigger heads to follow were the doublehump heads championed by the mid60s 327 engines. The 041 heads have a completely different right angle symbol on their ends.

Short doublehump casting marks heads with short doublehump casting marks were used in later highperformance sbcs. Actually, there are four part numbers for this cylinder head. As the decade wound down, the camel hump heads continued to endure with subtle tweaks for power improvements. Camel hump heads, adding accessory bolt holes chevy.

With a coat of chevy orange paint, youll have everyone convinced youre running an original set of 461 double hump heads. Check out the details, modifications, and tests we run on various types of heads, all. Apr 20, 2017 doublehump heads are a specific casting of cylinder heads for chevrolets smallblock v8 engine. 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. Take note that these heads have no accessory bolt holes for the front drive.

Tried them in the past and fouled out pretty quick. Correct for 6970 corvette, for your numbers matching build. Ict billet sbc alternatorpower steering pump accessory drive. This simple bracket cured our alternator mounting issues with double hump heads wout accessory bolt holes. The vortec heads have the 3 bolt holes drilled and tapped on each end of the cylinder heads. Sep 23, 2016 this simple bracket cured our alternator mounting issues with double hump heads wout accessory bolt holes. Later models were designed for use with accessory brackets that mount to the heads. Disassembly of the 492 double hump heads getting ready to machine the guides for positive seals. Also, if they really are camel hump heads never heard of camel hump heads with anything other than 2. They were used from 68 through 72 on 302 ci z28 engines as well as 70 through 72 in lt1 350 ci corvettez28 engines. Aluminum gm 3782461 chevy 327 sbc camel backdouble.

World sr small block chevy cylinder heads, straight plug, 2. The standard 461 heads intake port volume was 161cc, exhaust was 62cc. I have also seen this double hump head come with 1. Chevy small block history chevy high performance magazine. The 492 and 186 camel hump heads do have accessory holes.

Double hump heads, no accessory holes 160 cc runners. On the outside, the heads have the original double hump stampings and styling with drilled accessory holes and straight plugs for the nostalgia look. Nov 26, 2011 you have been given accurate info about casting numbers. With the 69 model year, chevy went to a long water pump design that placed the accessory drive units more inboard and mounted them on the front of the cylinder head using the accessory drive holes. Made from premium grade, lightweight a356t61 aluminum, dhc 175 heads feature the. 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. World products motown 220 clearly rates as the ultimate small block cast iron head. Camel hump heads, adding accessory bolt holes 092106 10. 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. They came off of a 69 327 that i bought to rebuild and im not going to be using them. The ac will bolt up to the head, but the brace that bolts up from the ac compressor bracket to the intake manifold will not even be close. Double hump heads, no accessory holes 172 intake runners. May 01, 2006 the famed camel hump or fuelie heads used until 68 had no accessory bolt holes and used 1.

Camel hump heads, adding accessory bolt holes chevy message. Putting the two heads together would get one of the locations. Dec 23, 2017 the first double hump heads had no accessory holes, because the brackets were mounted to the block or water pump. Accessory drive bracket double hump heads 305 327 350 383 5. The casting number of these heads are 462, 291, 461, among others, all differing slightly from each other. With highflow ports and standard intake valves, motown 220 heads are the ideal complement to large displacement small blocks 383 ci and larger. The 882 is a lightweight casting but ive actually laid them both on a bench sidebyside and the ports and chambers are as close to identical as you could ever get. The on the lower bracket where the single long bolt went through bracket, alt and screws into head. Pre1969 heads do not have accessory mounting holes.

Check out these chevrolet doublehump cylinder heads and youll find out why most are the same but not equal. Chevy 461 double hump cylinder head comparison tech talk. Like the previous camel hump heads, casting number. Both were used between 6466 on the 327cid and had 64cc chambers. Dhc 175 heads are made from premium grade a356t61 aluminum and have the exterior. Think you have to scour the local bone yards to find a decent set of gms old double hump or fuelie cylinder head castings. The phase 1 and phase 2 heads are the same head just no hump in them and some other upgraded stuff.

Both are good camel heads if you already have them or can get them dirt cheap. The first double hump heads had no accessory holes, because the brackets were mounted to the block or water pump. Heads with tall casting marks were identified as 291, 461, 461x and 462 castings and did not have accessory bolt holes. Bnarrow triangle over rectangle cn 520, 896, 1958 and up 283 power pak and 195760 fi. Camel hump heads, adding accessory bolt holes 092106 02.

I was under the assumption that fuelie heads had the double hump markings on the front, but had no bolt holes for any accessory mountings. Features 180cc intake runner, 62cc exhaust runner, 2. No longer will anyone have to choose between vintage looks or modern cylinder head powerwith dhc 175 heads you get both. Apr 09, 2008 the 60s hump heads uses a gasket seat, and 73 i think and up used taper seat plugs.

Trick flows dhc 175 cylinder heads give small block chevy enthusiasts a new performance option. These early heads did not have accessory bracket bolt holes. To keep with the vintage design, the heads are available with 69 later or without 68 earlier accessory bolt holes cast into them. 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. Step back in time with our modern reproduction of the iconic chevy 461 double hump cylinder heads, now cast in lightweight aluminum. No more searching junkyards looking for cylinder heads for your motor. Some of the small brackets that mount to the headers are weak and do break if you have a fairly hot cam. The bigger heads to follow were the double hump heads championed by the mid60s 327 engines. These heads had no accessory mounting bosses and bolt holes. Since then, the price from gm has risen steadily, but as this book is written, the. Fuelie heads archive checkmate community boating forums.

The edelbrock 2116 intake manifold will bolt right up and retain yo. Another major difference between the older 64cc heads and the later 76cc heads are the accessory drive holes located in the front of each pair of heads. Sbc lwp alternator bracket double hump heads adjustable. Isnt the accessory bolt pattern different on a chevy head for the left side vs the right side. I like the 186 heads just because they have the latest factory technology and metallurgy. Check out the details, modifications, and tests we run on various types of heads. Find ict billet alternatorpower steering bracket kits 551576. If selecting an aftermarket head, avoid choosing heads with too large of an intake port. Made in the usa from aerospace grade billet aluminum.