GM TH400 Billet Aluminum 0.250" Oversize Intermediate Piston [5.867″] 6L PI intake manifold

6L PI intake manifold

the amount of oil flow required to the valvetrain is greatly reduced

Speedmaster aluminum LS valve covers will give your Chevrolet LS series engines a totally new look

you can get 25 to 50 HP from these Proform main bodies

GM TH400 Billet Aluminum 0.250" Oversize Intermediate Piston [5.867″] 6L PI intake manifoldAlmost 10% larger that stock intermediate piston, the increased diameter applies more clamping force on the second gear clutch pack. Reducing the possibility of driving through the clutches as the power curve comes on strong. The stock 5. 617 center support piston has be increased by 0. 250" to 5. 867 in diameter.