Bare Heads, No Parts AFR's 325cc BBC Enforcer Cylinder heads feature our Permanent Mold “As-Cast” Technology surfaces on the intake runners, exhaust runners and combustion chambers that allows for extremely accurate and repeatable port location/performance. This budget friendly head is perfect for your 509 to 540 Cubic Inch operating below 6500 RPM.

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Melling GM LS Beehive Valve Spring Kit, Max Lift: 0.625", Steel Retainer,  145LBS @ 1.800" Seat Pressure, 358LBS @ 1.175"Open, 1.100" Coil Bind, Kit

Melling GM LS Beehive Valve Spring Kit, Max Lift: 0.625", Steel Retainer, 145LBS @ 1.800" Seat Pressure, 358LBS @ 1.175"Open, 1.100" Coil Bind, Kit

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