I have used these heads on a 400 cid, they came on 350 and 400. Mine came on a 350 two barrel, but I drilled the steam holes for the 400. They have a fairly large combustion chamber, I think they are 76cc. They also came with 194 or 202 valves. If they are the 202, they may be worth more to somebody else that is restoring a Z28 or vette, because that is what they came on. Good stock cast iron heads, but wouldn't spend alot of money them. Aluminum heads are not to expensive. Hope this helps.
Steve
