VMWW M M 7 37 7 7 A 7 77 3337 l AM T 3 A 7 iffl 773 3 1 RECOMMENDED CLEARANCES FOR LARGE BLOCK M 4 ENGINES g Piston to Bore 0065 OO75 measured at centerline of wrist pin hole perpendicular to pin Finish bores with 500 grit stones or equivalent smooth Piston Ring Minimum end clearance top 022 second 016 A Oil 016 Wrist Pin 0004 0O08 in piston 0OO5 O007 in rod End play 0 0O5 preferred i Rod Bearing 002 O03 side clearance 015 O25 minimum I preferred i Main Bearing 002 003 minimum preferred 005 O07 end Z play Piston to Top 0 OO5 average above deck with piston centered 3 of Block in bore Deck height specified is for a O40 N Deck Height compressed Victor composition head gasket If thinner head gasket is used deck height may be i Q reduced accordingly For best results piston deck to cylinder head clearance should be estab lished at 035 O40 with piston centered in bore j Q Valve to Piston O20 exhaust 0l5 intake at 0 valve lash K 4 Clearance Note These are to be considered absolute minimum E E clearances for an engine to run below the valve j train limiting speed of 7600 RPM If you intend kr to run up to valve train limiting speed more clearance should be allowed Oversized pistons i are available through Dealer Parts and Service 5 if needed to restore proper piston to bore clear i ance when rebuilding NOTE Additional specifications are available in the Dealer Shop 1 Manuals 1 I RECONDITIONING SPECIFICATIONS i Connecting Rod Bearing Bore Diameter 2 3247 2 3252 Inch I Main Bearing Bore Diameter 2 9371 2 9380 Inch ija l2 11 16 70