Dunno if anybody on here remembers me, but I haven't been an active member for awhile. I have a 1990 with a 87 TC block and a bunch of go fast goodies. I blew the head gasket awhile back and haven't had time to replace it. But I've caught up and now I'm gonna get back into it. I need to pop my Esslinger head and a237 onto the block. Now for the real question. Is there anyway to clean the pistons? I took the head off left it sitting for awhile and now the pistons are coated in black gunk and a tiny(very very small bit of rust) or should i just yank my Merkur block and swap that in? Thanks guys any info is much appreciated.