360 small block (big power)

If and only if all the steps are taken to properly do it, I run tighter. The last RB 505" I did had .030. typically I want tighter than .040, and I will bring the piston up .010 proud to get that with std gaskets. There is power to be found and no loss of effect going tighter. There is a loss on both issues going wider. No 4" arm under 6500rpm small block will have a problem running .030 unless your running aluminum rods for some strange reason. But this means the stroke has to be exactly on, as do the rod lengths, and the deck height all the way accross the decks. Differences of .003" or more can cause problems at that level. So for the most part you'll see me say run zero deck and the .040-.043 gaskets. That allows for some error on the part of parts and machining and still give a strong lowering of detonation and power production.