68mm Mercruiser Throttle Body
TPIS Dual Bore 68MM Throttle Body for Mercruiser Mag 454 & 502 Engines - Have you upgraded your stock Mercruiser Big Block Chevy to a 540 or larger engine? Increasing the bore size from 60mm to 68MM, this throttle body will let your big displacement engine breathe. We fully dis-assemble each throttle body, CNC machine the bores, machine the throttle shafts for better air flow, and install new CNC machines throttle blades. These are available on an exchange basis or we can modify your throttle body if you prefer.