Product Description Specifications Serious street/strip effort. 9.5:1 to 10.5:1 compression. Aftermarket manifold, headers and 3.91 gear. 3000-3500 stall in automatic cars. CARB: This product is not CARB Legal and not for sale in California Category: Engine Components>Camshafts Core: N LTL: N MPN: SK20-243-4 Proposition 65: Y Special Order: Y