0109Gmhtp Pumpingup28 Zoom
396 Short-Block Install - Pumping Up, Part 1
The Lunati ring set uses a moly top ring and a ductile iron second ring. For naturally-aspirated street applications, Aaron suggests using a top ring gap equal to 4.5 thousandths per inch of bore, and on the second ring 4 thousandths per inch of bore. (Our 396 got 18 thousandths on the top ring and 16 thousandths on the second ring). For nitrous, blower or turbo applications where combustion chamber temps are higher, more gap is preferable--5.5 to 6 thousandths per inch of bore on the top ring and 4.5 thousandths per inch on the second ring. Race engines with more compression--and thus more heat--should also get more end gap. The extra gap allows the ring and cylinder wall to expand more before binding occurs. View Related Article
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