Kits are an upgrade to the stock oiling system, delivering increased oil pressure and return scavenge volumes from an OE+ billet oil pump and matched OE+ billet cam plate (see OE+ oil pumps for complete specs) OE+ billet cam plates have increased rigidity and are machined to tighter tolerances compared to stock OE+ cam plate pressure relief valve and spring are pre-set, matched and seated by FEULING« with a full pop-off pressure of 50-60 psi. Made in the U.S.A.. OIL SYSTEM OE+ 99-06CHAIN