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Old 06-15-2006, 10:01 PM
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Camel hump heads

Good evening to all. I am finally back into hotrodding, and have a couple of questions for whoever can answer them. I have a '59 El Camino that my uncle put a 327 in from a 1965 impala. I have since pulled the engine out and I am begining the rebuilding process. I noticed that the heads had the unique camel hump stamped on the front of them. After doing a quick search on the internet of the casting number I found out that they are the 1.61 62cc heads. Another uncle of mine says that a Chevy book he has claims that these heads have the 2.02/1.77 valves and that they are high performance heads. Can anyone help me out with which they really are? Secondly, what compression pistons do you recomend to use with these heads, depending on which ones they are.

Thanks,

59ElCamino

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Old 06-15-2006, 10:42 PM
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heads

3782461....64-66...327......Camel hump,no accessory holes,160/62cc port volumes,62cc chamber
3782461X...60-63...283/327..Camel hump,no accessory holes,larger 172/64cc port volumes, 62cc chamber

this is the closest i could come
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Old 06-15-2006, 11:01 PM
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What are the last three numbers of your casting? That will help identification.

Also - I have never heard of a Factory head with 1.77 exhaust valve?

Be careful with your compression ratio - 62cc chamber is pretty small. They may even be smaller if they have been surface in any previous rebuilds.

Depending upon the head gasket you choose and pistons, you will want to play with the numbers to make sure your CR is not too high. I get almost 10:1 assuming a .030 overbore, flat top pistons with -5cc valve reliefs and a 0.037" thickness head gasket.

Compression Ratio Calculator

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Old 06-16-2006, 07:39 AM
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Very few '65 Impalas came with a 327 other than the 250 and 300HP, I have never seen one with the SPHP 327's that used the 2.02"/1.60" valves but that's not to say a few weren't built, but very few, the 409 and all new 396 were the performance engine of choice for the Impala in '65. Both the 250 and 300HP used the same heads which used the same 461 Camel Hump head castings as the SPHP 327's but these versions came with 1.94"/1.50" valves and will usually cc at 64-66 on the chambers if they haven't been milled.
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Old 06-16-2006, 07:55 AM
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Nothing really high performance with double hump heads anymore. Twenty years ago they were the best high performance option but not any more.

If you want to make hp get a new set of aftermarket heads like dart, afrs, trickflows, edlebrock or even a set of GM vortec heads and make another 50 hp with the same engine.
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Old 06-16-2006, 09:12 AM
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go to 1320.com click on links then chevy casting numbers goto small blocks and find your numbers they will tell you what you have for sure.i've used it several times and it has been right every time.
hope you find the answer your looking for.
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Old 06-19-2006, 01:55 AM
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Quote:
Originally Posted by RHamm1320
What are the last three numbers of your casting? That will help identification.

Also - I have never heard of a Factory head with 1.77 exhaust valve?

Be careful with your compression ratio - 62cc chamber is pretty small. They may even be smaller if they have been surface in any previous rebuilds.

Depending upon the head gasket you choose and pistons, you will want to play with the numbers to make sure your CR is not too high. I get almost 10:1 assuming a .030 overbore, flat top pistons with -5cc valve reliefs and a 0.037" thickness head gasket.

Compression Ratio Calculator


I think your math is a little off. the calculater asks for gasket thickness and deck clearance wich should be approx. .025 if never decked which buts that to .062 clearance which would drop the compression down quite a bit. probably closer to 9-9.25:1 not 10:1.

The 461`s came standard with 1.94/1.5 in the lower hp versions and 2.02/1.6 were available which was already said. For a mild street motor they will be fine but depending on what your planning from the motor, it`s cheaper to buy aftermarket heads these days then to rebuild a 40yr old set of heads.
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