whats your reason for the 4/7 on the low deck. after reading alot about this, i'm starting to understand the fundemental principles of why the 4/7 is a good idea. i'm also staring to think its a combination of parts. intakes obviously, evening out of crankshaft harmonics, and i'm betting Rod/Stroke ratios has ALOT to do with it. this is all just a guess tho. no harden facts to back it up other then it does seem to make more peak and under the curve horsepower on some engines.