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So a friend gave me three sets of heads today for free.
1 set 882's
1 set 434's
1 set 993's (mildly ported)
and 1 461 (someone stole the other one )
which is the best set??
From this comparison the 882 is better: http://chevyhiperformance.com/techar...98/index4.html
882 - This head had the smallest port size of all the heads we tested. A set of 2.02/1.60-inch valves can be swapped in but be aware that without blending in the short side radius, the results usually find lost airflow.
462 - This head was a small chamber head used on 327ci motors until the end of 1968. The flow can be improved a little with larger valves and port work but the additional cost of this is impractical in comparison to what you can by some other aftermarket casting for.
Joe