Hot Rods 302 40 over

I built a 302 that was bored 40k. How many cubic inch is it now?

 

BoreXboreXstrokeX.7854X#ofcylinders. Write it down and then you will be able to alwahys figire it out yourself. Incidently, .7854 is quarter Pi. That makes it a simple multipication function with no division necessary.

 

307.66 CI. Approx. = to 308"

I use this site.

http://www.wallaceracing.com/cid.php

pdq67

 

Yep, they call a 30 over a 306 and a 40 over a 308.

Don

 

I like the math. The multiplier is easy to remember. It's just a little clockwise square in the upper left corner.

 

Bxbxsx6.2832 is easier and faster, v8 only

 

From experience. keep an eye on the temp. 289's & 302's get tricky at 40 over and tend to run hot. Thin wall blocks and core shift are the culprit. I gave up on production blocks if doing any sort of hot SBF.