318 combo's

It's not hard. If using a 360 crank,simply have the main journals cut down to 318/340 diameter. Pistons are tricky,but off the shelf low compression hieght 318 truck pistons ( 1.658 ) can be made to work with a little clearancing of the skirt and you get a streetable compression ratio.

Scat makes a crank especially for this combo. Retail is about $300 from Summit.

BJR has a thread about this combo in the tech archive. I have to give him credit. His idea originally. It's an older build tecnique,racers did it back in the day when there wasnt any other stroker cranks.

You dont need 4 bolt mains in a sbm unless your going trans am racing...