LSM SC-420

SC-420 On Head Valve Spring Compressor

Regular price $259.99
Shipping calculated at checkout.

On head valve spring compressor for LS3/LSX and Jesel rockers. 

1.40" centerline, non-slotted base for 5/16" bolts

Small retainer housing with an OD of 1.235" 

15 degree beam


*Overall length of mounting base is 2.00" which is 0.25" less than our SC-200 base length in order to fit between the rockers better.

All LSM on head valve spring compressors can easily and safely handle 1,000 pounds of seat pressure with our screw down method that will not spin back. Plus, you won't need an extra set of hands so you don't lose your keepers. No need to take off the pedestals - our compressors bolt right to the stands!

Why choose LSM?

Legendary Heritage

Our company was founded over 45 years ago with integrity and a passion for making the highest quality products.

Made in the USA

With your valued purchase not only are you getting a true quality product, but you are helping support American manufacturing.


We share our love for cars and racing with each product we make. LSM proudly designs and manufactures all our products here in the USA .