Direct bolt-in upgrade replacement for the OEM camshaft support plate in combination with the stock style hydraulic chain drive system. Compatible with OEM oil pumps only. CNC machined from 6061 billet aluminum for increased rigidity. - Matched oil passages to the engine case passages - Kidney shapes are designed to maximize flow - Optimizes oil flow to and from the OEM oil pump reducing oil and engine temperature - Tighter cam journal bore tolerance for improved cam fitment - Added cam journal oil groove for cold start up protection and increased cam journal lubrication - Added oil pressure feed holes to front and back of cam journal to prevent excessive thrusting wear - OEM replacement reference 25400133. Note: Using gear drive camshafts require 566113 block off plates; which must be ordered separately. to block off the oil holes for hydraulic chain tensioners. Note: 707074 Feuling X ARP oil pump bolt kit is optionally available.