I cant seem to find the problem. I just replaced my intake gasket as my last was a valley and it had a leak on one side but all the plugs were showing slight signs. I have a 750 vc sec with 74 pr and 84 sec(I just switched to 76 p/86 s after run). Intake was free of any damage/cracks. I have replaced my fuel pump(carter marine mech), fuel pressure gauge(holding 5 1/2 -6 psi), ran all new lines, inspected tank(new aluminum), replaced plugs (to get a good reading)....Its a 460 mild cam d3ve heads performer intake with log exhaust. I ran it this weekend at elcap and water temp was around 130 give or take a couple. My timing is set at 33 @ 3000. I do ad mystery oil (1/2qt to a full tank 40gal) in my gas and run 91. The plugs after a couple runs around the lake and some 30 + mins of idling around they looked like I washed em. I could see all the way down the ceramic....whats next?