World's S/R cylinder heads are the preferred alternative to expensive OEM castings or junkyard rebuilds. These heads are designed with extra-thick decks and walls for improved reliability as well as equipped with hardened steel exhaust seats that are compatible with today's unleaded gasolines. They are machined for screw-in rocker arm studs for extra durability. S/R Cylinder heads are fully 50-state emissions legal and because they are an OEM replacement head, they are legal for use by many oval tracks and race Sanctioning organizations. WOR-043640-1 Chamber Volume : 76cc Make : Chevrolet Material : Iron Notes : 87 up intake face Runner Volume : 170cc Spark Plug : Straight Valve Head Diameter : 1.940/1.500 Valve Spring : 1.250

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