Quote Originally Posted by jmg8550 View Post
I didn't think a 289 could be bored and punched to a 331. If I remember right, the 289 has a shorter deck height than a 302W. Do your pistons have any valve reliefs cut? What size combustion chamber size? Rocker ratio? Total cam lift? Is this a high compression engine?

Also, why not build a 5.0 roller motor? Better valve train, more parts, probably easier/cheaper to stroke...
Some say the cylinder walls are shorter in 289 blocks but it's one of those "Internet mysteries". Only thing I saw consistently was 347 strokers "push" it so that's why I went 331. Also the stroke ratio is better on the 331 for quicker revs. Bore is the exact same on either block, 4.00. Bor on mine is 4.030, stroke is 3.25. 5 cc valve reliefs, 60 cc chamber, 1.6 ratio, .500 lift, 10.1 compression.