Our HD 115lb 24v Cummins Valve Springs have been proven with years of testing. We have seen over 120psi of boost on one of our Stage 3 cylinder heads with these springs. These are the same valve springs we included standard on our Stage 1, Stage 2, Stage 3 and Stage 4 performance cylinder heads and come in all non-roller ENFORCER engines.
We recommend using our 24v cummins titanium retainers when over 4400rpm or 1000hp.
* Spring retainers not included.