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Old 05-07-2011, 11:04 PM
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aluminum heads for a 327 sbc

would like to see what would be some recomendations would be for getting a set of aluminum heads for my 327 sbc, I currently run the camel hump heads 64cc chamber heads 2.02/1.60, this 327 is a good street/ strip built engine and had thought about upgrading to a set of aluminum heads. I just do not know what direction to go with.. I dont know what the cc rating is for the runners on my heads compared to what i could possibly get with aluminum heads or whats bad or good.. I know there are other factors iin considering a set of heads, but just would like a few recomendation

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Old 05-07-2011, 11:31 PM
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Just the same as you can use an intake manifold that has too much volume, you can use heads that have intake runners that are too large. Of course, you can also have runners that are too small. Most of the 355's that are built will run well with heads in the 175-195 cc intake runner volume area. This is predicated on multiplying the cubic inches times .5 and then by .55, then choosing a head in between somewhere, based on how the motor is expected to perform. For a street motor, you might want to choose on the low side, so that at low rpm's the velocity is high and the cylinders will pack well, producing good torque. For a strip only or street-strip motor, you might want to choose on the high side so that the motor will not be choked with small runners at higher rpm's. If I had a 331, I might be looking for heads with runners somewhere between 165 and 185. A street motor will do well with 1.94"/1.50" valve head sizes, while 2.02"/1.60 valves might work a little better at higher rpm's.

I don't trust anyone period, for anything or any reason and I most certainly would not trust head manufacturers to tell me the honest truth about the flow of their cylinder heads. I do a lot of software dyno testing on different combinations and have learned to factor the manufacturer's published flow by .9 in order to reach for a little reality.
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Old 05-07-2011, 11:41 PM
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thank you for the info, yes this is a 331.. 327 .030 over, the power band on this application is built between 3000-6500, I just did not know what brand would be a better fit?
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