[Ed Wright]

Adger is correct, of course. Patterson has me bring the same gasket and actual head bolts & washers I'm going to use when they hone mine. Bad enough getting the heads off one of these 4th gen F body cars with bolts. I'm too old to fight studs too, at least in an iron block. I have run several engines both ways over the years, and if the block is prepped correctly, mine have always run the same with either fastener.