Ideal Drag Race Bore and Stroke

It’s hard to nail down but posts 62 and 63 are pretty good general rules.

I want to emphasize it’s not really a long verses short rod discussion, it is really about the ratio of the stroke to rod length.

A 6 inch rod and a 3 inch stroke is 2:1. A 6 inch rod and a 6 inch stroke is 1:1.

I think talking about rod length muddies up the waters when talking about this.

IMO you can use a later IVC and and an earlier IVO with a high(er) r/s ratio.

And with that, more overlap and a faster closing ramp on the intake side.

And probably a 6-8 degree spread on the exhaust so you can get the EVO back where it should be. Especially if you want to extend power after peak.