I alway's go with the piston and ring maker's recomindation but i also like the gapless ring's they join high low and i believe break in has alot more to do with blow by than ring gap .
I believe that a engine broken in under load with loading and unloading seats better than babying it for 500 miles just my 2 cents and i also recomend spending a few dollars more for quality rings. and i think every performance engine has used the same ring gap.
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89 with 331 t3'/t4 hybrids. upr Suspention worked out finnaly . 9.89 144 mph .
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