Quench

Well I will say it’s probably overkill with a 100 shot, but the Felpro 8553 has a gasket bore of 4.18, so that gasket reduces said shelf amount by .020. And there is still a space between and the decks, but it’s not a .045-.055 inch gap that’s recessed back .070 from the bore between the block and head. Now it ‘s hopefully a 1/16 inch gap that is roughly 1/32 (with a .030 overbore) distanced from the edge of the cylinder between the block and head that gradually blends as it makes its way to the chamber. The idea is to get rid of the gap between the chamber that end gasses can wait around in to potentially cause detonation. The best option is a cometic gasket that is .020-.030 larger than the bore size (if you have the proper RA finish on the decks. Then you could go with a thick enough head gasket to avoid having radius the chamber. Another option (and the one I would use if the bottom end is already together) is a Mr. Gasket .040 thick rubber coated MLS head gasket with a 4-1/8 inch bore, and the chamber recessed.030 deep. It is overkill for a 100 shot, but I’ve never met anyone who was content with a hundred shot. Once the nitrous bug bites, you’ll eventually want to see how much it can run on. And that’s why I believe in overbuilding anything that’s going to be sprayed. It’s just too easy to turn the power level up on to see what you can get out of it.