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Old 10-01-2002, 11:12 AM
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Post are these heads good?

I have a 350 engine that has 10:1 pistons,medium lift cam and edelbrock perfomer intake.I was told the heads are so so.They are 69/70yr 350heads with 76cc chambers.Are they good or should I change valve size or go with something else I have other ? but I will go one step at a time THX

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Old 10-01-2002, 01:05 PM
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Not enough info. What is the casting #? All that can be said at this point is that the '69-'70 heads were still the heavy (good) castings. Also, you say you have 10:1 pistons, but I'll bet that's with 64cc heads. With 76cc you drop to about 9:1.
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Old 10-01-2002, 07:33 PM
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the casting #is 3932441 I was told the pistons were 10:1 but I have to tear down the engine to make sure. Are there # on the end of the camshaft if I pull the gear off. I have played with this stuff for 30yrs so it is all new and different from then

[ October 01, 2002: Message edited by: rusty9663 ]</p>
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Old 10-01-2002, 07:38 PM
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441 heads are good factory heads.About the best of the large chambers I believe.They should be good in a street motor.
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Old 10-01-2002, 10:01 PM
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what size are the valves and what would happen if i port and polished myself? I use to have a 396 in a 1930 Essex and it worked
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Old 10-04-2002, 07:04 PM
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I looked up your head and its a 1970 casting for passenger cars rated at 250 h.p. they are equipped with 1.94 int. and 1.5 ex. and have a 76.26cc combustion chamber, if you are going to port them just clean up the flashing left over from the casting process, take down the short side radius a little bit and consider cleaning up the combustion chambers and match port the intakes. other than that you'll need a flowbench and have the sucker cc'd and whatnot. also do not polish, you need to keep up a surface roughness for what is known as boundary layer agitation, that turbulence keeps your fuel is suspension, if you polish it the fuel will pool and cause driveability problems.

[ October 04, 2002: Message edited by: Jay396 ]</p>
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Old 10-04-2002, 07:22 PM
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Open chamber heads respond well to basic "pocket" porting techniques. I would suggest that you buy David Vizard's book on small block chevrolet cylinder heads. It's very informative, and gives you pretty good advice on pocket porting, and other cylinder head modifications.
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