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1.250" Valve Springs, Center bolt valve covers,175cc runnerTrick Flow® Super 23® Street Cylinder Heads for Small Block ChevroletReplace those factory cast iron heads.The Trick Flow® Super 23® Street heads are high performance replacements for original equipment cast iron heads and accept most factory accessories. They feature angled spark plugs, 56cc combustion chambers, 1.940 in./1.500 in. stainless steel valves, hardened ductile iron valve seats, and high-flow 175cc intake ports with a small cross-section design to promote low-rpm torque and high-rpm horsepower. Trick Flow® Super 23® Street heads are available with three spring sizes: 1.250 in. singles for cams up to .480 in. lift, 1.470 in. singles for cams up to .540 in. lift, and 1.460 in. dual springs for cams up to .600 in. lift. The heads come fully assembled with stainless steel valves, valve springs, locks, retainers, ARP rocker arm studs, and guideplates.
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