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Made to outperform factory small block Chevy heads on 283-350 c.i.d. street performance engines, Trick Flow® Super 23® 175 cylinder heads feature small cross-section intake runners to promote low-rpm torque and high-rpm horsepower on small bore engines. Fast As Cast® runners duplicate the runner profile and performance levels of CNC-ported heads—for about the same price as ordinary cast heads! Other features include angled spark plugs, raised valve cover rails, and extra-thick decks and walls for porting. 1957-67 Chevy small block Gen I 4.6L/283




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