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Getting this much flow from a stock geometry 23° head means they will only be available in fully optimized "competition" CNC porting
This is a NHRA mandatory specification
4L L4 F/I - All 1999 TOYOTA 4 RUNNER 3
2L L6 F/I - All 1991 FORD SIERRA 1
Chrome Moly V8 Ring Set SPE243K 060 Promotional Getting this much flow fromChrome Moly V8 Ring Set4. 185 Bore +. 060, 5 64"X 5 64" X 3 16", Std Tension SPE243K 060 E243K 060 Speed Pro piston rings dominate the racing industry with technically advance design, dedicated research and superior quality. We don't rely on advertised gimmicks and "trick of the week" deigns. Our rings deliver optimal cylinder sealing under true operating conditions, and provide maximum oil control. Speed Pro pistons rings deliver superior performance
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