Elliott, thanks for the input. From the research I've done I think my cam profile will land somewhere between 206/206 and 218/218. Incidently, Edelbrock recommended their Performer RPM cam. I could look into a custom grind but for my low RPM application I'm not sure the additional expence would justify the minimal gain. Narrowing cam selection down to a basic category is the easy part, nailing down the exact duration desired is the hard part. I need a cam with enough intake duration and valve lift to ensure the cylinder gets a good charge with a high velocity finish (taking advantage of the dual plane intake) and enough exhaust duration with enough lift to ensure good evacuation. I Don't think I want to go over 220 on either one because to much overlap will adversly affect performance at low PRM (hence the higher duration = more overlap works better at high RPM which demands the single plane manifold). I think the recomendation from both cam companies are in line and almost identical. Note that both are above what would normally be used for a low RPM application but because of the additional cubes a little more cam is required but would feel like a cam of lesser duration. This is a very difficult area of engine build and open to much debate. I welcome all the data I can get.
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Originally Posted by J20
