Calling all 318 guys....318 vs 5.2 magnum, info needed please

If you want that 340 you never had out of the 5.2, then sonic check it for the max bore and go there. While I doubt you’ll get to the 4.04 bore size, it’s the bigger bore size that that top end charge the 340 is known for.

I did a 5.9 in a ‘79 B body Magnum w/a 727 & 3.55’s on 245/60/15’s. RPM intake, 600 Edelbrock carb, super comp 1-3/4 into a 2-1/2 exhaust JY distributor. I used a B&M flexplate to couple it all up. It was good on power until approximately 4500 rpm where it started to odd over. A cam to replace any stock one is a good place to seek additional power and rpm.