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Massive selection from top brands on ebay. com. Performance cylinder heads enhance the airflow into your engine, giving you improved power and torque. Bolt on a set of speedmaster's fully assembled cylinder heads for. You will need to get the speedmaster head bolts as recommended (8 are longer than stock), and they will work. The jegs recommended speedmaster push rods did not work. These kits are specifically. Get your pontiac out of the garage and back on the road with these modern performance cylinder heads from speedmaster! Other shops sell ported 240cfm iron heads for $1950. The ls (gen3/4) platform has many design benefits over the earlier sbc engine designs, most notably the cylinder heads. Speedmaster cast aluminum cylinder head big block chevy 454 w/hydraulic flat tappet cam Speedmaster™ cylinder heads offer improved power throughout the rpm range. Performance cylinder heads enhance the airflow into your engine, giving you improved power and torque. Bolt on a set of speedmaster's fully assembled cylinder heads for instant power gains. Get the best performance with speedmaster cast aluminum cylinder head big block chevy 454 w/hydraulic roller cam pce281. 2033 parts at jegs. Shop now at the.