Quote:
Originally Posted by tdangle
I have a L31 variant from GM. The SP350/357 which is basically a L31 with a hotter cam. The instructions said to run premium. Wonder why, I might try regular and see if it works OK.
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The instructions likely also said to use 10 degrees initial timing and no vacuum advance and be installed by a certified technician.
Just a few of the ways the bean counters can void your warranty if you have a claim.