SCS Professional Series Quick Change Gear Set - 6 Spline - Set 623 - 4.11 Ratio 2.99 / 5.65 - 4.33 Ratio 3.15 / 5.95 20194XZK Most high performance engines today

Most high performance engines today require the use of larger-than-stock diameter valve springs

Holley Base Gasket 108-25 1

Without adequate testing

4-1/2 in Deep Pan

Slip Fit Connections for Easy Assembly

SCS Professional Series Quick Change Gear Set - 6 Spline - Set 623 - 4.11 Ratio 2.99 / 5.65 - 4.33 Ratio 3.15 / 5.95 20194XZK Most high performance engines todayManufactured from 9310 aircraft alloy for maximum strength, 6 spline quick change gears are crown hobbed, broached for 6 spline shaft fit, and black oxide finished for corrosion protection. Gears undergo a five step heat treating process to deliver maximum durability. Since 1979, SCS Gearbox, Inc. has been listening to it's customers! When SCS Gearbox first started manufacturing, it was to meet the needs of tractor pullers to provide specialized