One of the most popular valve springs in the LS1 performance market. Design marketed in Australia.

Anytime you swap from the stock 3800 valve spring, it will require the LS style retainer which we sell here.

 What valve spring is right for me?

150# springs are at closeout pricing. Head machining required to run the 150 lb springs! The spring seat needs to be opened up to clear the larger base of the spring, and the seat needs to be cut deeper to change the install height to 1.88" instead of the standard 1.8".