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my pop's is runing a pair of "4416" 305 heads on his 350 flat top .60 over motor, with head gasket thickness of 0.41, here lately #6 plug is oil fauling, thinking the guide or the seal mayb gone lol, runs very well, needs 93 octan, but he refuses to run it, he is runing 89 octan now with the timing set @ 34 total, runing autolites 24's....
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