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Message: <blockquote data-quote="Spyder" data-source="post: 97074" data-attributes="member: 8356">I just have a couple questions concerning a 331 i might be purchasing, and i was hoping some of you guys might be able to help meIm looking at a 331 stroker, forged JE pistons and I-beam rods. The crank is stock and there is also a girdle. My question is concerning the heads. The heads the guy has on it are the cast iron Roush 200 heads.The intake runners are 200cc and the valves have been upgraded to 2.08 int, and 1.90 ex. Also it has high strength double valve springs.With the 64cc combustion chanber the compression ration is checking in at about 8:1. It was built for boost, then he abomndoned the project.My question is, are these heads too mush to run N/A? With that compression ratio, is it gonna be a turd?Now, i have a set of Edelbrock Performer 5.0 heads. They are aluminum, 170cc intake runners. 1.90 and 1.60 valves, and a 60cc chamber.would the heads i have be enough for a 331?Edelbrock states that these heads can be used on a 351, so does that mean they will be enough for a 331?Also, what would my compression go up to from the 64cc roushs to the 60cc edelbrocks?Any help would be much appreciated.</blockquote>