It is best to test it on the dyno or on the track but I would start with 14 degrees. If you get to the track then you could test it by going up two degrees to (16) after a run and test it and see if you gain or lost mph not et and if you lost then go back 4 degrees to 12 degrees and find out what works best.
I would guess your 1/4 mile to be around a 15.2
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James Cox
nochevy@hotmail.com
1991 Mustang LX
No good times with 347 stroker yet!