Ideal Drag Race Bore and Stroke

I find interesting that a NHRA Pro Stock engine stroke is only 3.600, it seems like most people are about the 4 inch crank for a small block and a 4.15 or 4.25 for big block.

In a normally aspirated racing engines the bigger the bore the bigger the intake valve you can get in the heads and clear the cylinder walls. Bigger valve, bigger potential flow.

I can tell you that most tracks are not prepped enough to run lots of stroke and hope to keep the tires hooked up.

For this reason a more successful bracket car should run the biggest tire you can and limit the stroke to 4.00" or less.

You can't win if you break loose at the start, or can't keep it hooked up all the way down the track at a subpar facility.

Tom