HOLLEY 850CFM CARBURETOR REAR METERING BLOCK TAKE OFF # 850 REAR MB TO Rate_Engine deck height* 1054 billet steel deck height* 1054 billet steel 6 bolt main bearing caps* 6 bolt cylinder head bolt pattern* Cam bores that can be machined to accept 60mm roller bearings* Can be machined for larger diameter lifters* External oil pump feed at the rear* Added 7th transmission bolt hole to work with early style GM transmissions* Can accept a front motor plate for racing use* Threaded freeze plugs that can be used for external heaters or coolers* Windowed main bulkhead Kit includes four 8 in HOLLEY 850CFM CARBURETOR REAR METERING BLOCK TAKE OFF # 850 REAR MB TO THESE ARE BRAND NEW HOLLEY TAKE OFF ITEMS