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Speedmaster LS-series cylinder heads are rapidly expanding. The LS (Gen3/4) platform has many design benefits over the earlier SBC engine designs, most notably the cylinder heads. Although the GM heads are good pieces, We have developed a superior line of heads for modern performance enthusiasts. Like all Speedmaster cylinder heads, the LS-series heads are produced using our "Gravity Casting" process. This process ensures a more uniform and robust casting, laying a strong platform to build on. Assembly SpecificationsMax Lift: .625"Coil Bind: 1.180"Intake Install: 140lbs @ 1.8Exhaust Install: 140lbs @ 1.8Open Seat Pressure: 335lbs @ .
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