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Message: <blockquote data-quote="ryclef331" data-source="post: 97106" data-attributes="member: 8067">First off, I'd be wary of someone saying a storker crank is "stock." He probably meant "cast." You need to be sure your info is correct and you know everything about that motor. Second, you need to know EXACTLY what kind of pistons he is running...I'm talking down to the part #. Also the type of head gasket. As for the heads, I'd say the 200cc roush heads might be better off for you running NA but if he's running a dished piston (more than likely if he's claiming 8:1 CR), the motor is going to be a dog regardless. The Roush heads sound like a better head for that motor. The only benefit I see in running the performers is the fact that the aluminum is more resistant to retaining heat in the combustion chamber there by lessening your chances of detonation BUT if you make SURE you run 93 octane at all times, this is a moot point. The smaller runners and valves will boost low end tq but the motor will fall on its face above 4,500 rpms. As for the compression, I can calculate it provided you know the part number of the piston OR how many cc's the dish of the piston has plus valve reliefs but with only a 4cc difference, it isn't going to go up much.</blockquote>