Ya I know 18 degrees is alot but I have heard no signs of detonation. I run Sunoco 94 and I also gaped my plugs to .49 stock is .54. T-Bone did that bigger meter give you a nice increase in power? Oh ya that 1/4 time was with out the Timing Adj and Cold Air.
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98Cobra-3.73,Offroad
Xpipe,Flowmasters,Mac Cold air,SteedaTiming Adjuster17deg,Autometer Shiftlight,NittoDragRadials
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