4.1's suck, I won't buy them, and a warranty company I work with charges $55 extra just for a 90/3000 limited powertrain warranty on one. The last wet and wild race I was in (25 laps at sunshine in demo derby style cars on a wet track ) had one 4.1 cadillac entry, and it overheated sitting in the infield waiting to line up, he never even made a lap. In case I wasn't clear, 4.1's SUCK!!