340

When you see a 289 Mustang street car punch 11's, what's wrong with a 318 ??? Or a Fox body 302 go 10's, what's wrong with a 318??

Ain't Nut'n wrong with 'em..... roll up the sleeves and get to work !!!!
:thumbsup:
I like bigger bores hence the comment of .060 or better of possible.
And nowadays the pistonchoices are actualy better for the 318 than a 340 if you are running old open chamber iron heads.
Helps ya.