What do the majority of you guys use? Marine ones or no? I boat only in Freshwater so I dont know if that makes a differance or not. I've had great experience with Felpro 1003's on all my SBC buildups. Felpro makes a gasket which is 40 a piece that has a stainless core and I see that GM sells their gaskets with a stainless core for 17 bucks. These come stock on the new MerCruiser motors. Are the GM ones any good? (I suppose as my motors still ok with them.) Big price differance though.... Always gets me wondering.