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i say no timing pull should take it like a champ a cuz of mine sprayed 125 on his zo6 and work good had it like that for about a year or so no problems just changin gout the plugs
I"m at a 150 now, he is not kidding about the NX kit being fat, the 150 called for like a 64 nos jet and a 38 fuel, I had to drop to a 30 to get it even remotely close to not being fat.