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Return to Parts List Category : A- Small Block "LA" : Pistons (340 Stroker) : Flat top Forged : 4.080" Bore DIA 51009 DIAMOND FORGED 4.080" BORE FLAT TOP 416 FLAT TOP 10.9:1 WITH 65CC HEADS / DIAMOND FORGED (.927" PIN) $874.56 4.080" Bore   Designed to fit most OEM open and closed chamber heads Will work with aftermarket Edelbrock & Indy heads Can be used with small nitrous applications.  4032 alloy Ratios figured for .018" deacj @ 9.600" Standard 1/16" x 3/16" ring package Premium 8620 wrist pins included Gasket volume = 8.9cc's Top ring down = .310" Max valve diameter = 2.070" diameter intake & 1.625" exhaust valves Valve relief depths = .292" intake and .224" exhaust     C.D. Approx. Weight Pin Size CC's Comp 60cc Comp 65cc Comp 70cc Stroke 1.457" 500gr .927" X 2.750" -6.8 11.6 10.9 10.5 4.00"     Related Parts: CR4030NF Total Seal Ring Set