[scottj]

Stock size 351W mains aren't ideal, but will survive in a large engine in the RPM range where street heads will make power. The aftermarket race blocks are offered with a 302 main or a Cleveland main. Typically, strokes less than 3.625 use the 302 main, strokes over 3.625 use the C-main, and 3.625 strokes could be either... typically. At the forefront of stroker SBF endurance engine design you'll find CORR truck engines and Dirt Late Model circle track engines (same engines). All sizes of these engines make over 800hp and I've seen big ones (460ci) dyno @ 875hp and 750 tq with a single 4bbl carb. The big ones turn up to 8000 rpm and the smaller ones up to 8800 or so... all day (or night) long.

Scott