V I r RECOMMENDED CLEARANCES FOR SMALL BLOCK V 8 ENGINES F I Piston to Bore 0055 0065 measured at centerline of wrist pin hole perpendicular to pin Finish bores with 500 grit stones or equivalent smooth Wrist Pin 0004 00O8 in piston 0005 0007 in rod for floating pin 0 O05 end play preferred Rod Bearing 002 0025 side clearance Ol0 020 Main Bearing 002 0O3 minimum preferred 005 007 end play 1 Piston to Top of Block 0l2 0l5 average below deck No Deck Height part of piston except dome to be high er than deck of block Deck height I specified is for a 020 steel head gasket If a thicker head gasket is used a piston to cylinder head clear 5 ance of 035 should be considered mini I V mum i Ky Q Q Valve to Piston 010 Intake 020 Exhaust checked at zero lash during valve overlap cycle 3 These are absolute minimum clearances l to allow for heat expansion only and will not accommodate valve float from 1 Q over overrevving Oversized pistons are i available through Dealer Parts and Q Q Service if needed to restore proper Y piston to bore clearance when rebuild Q ing g NOTE Additional specifications are available in the Dealer Shop I Manuals W RECONDITIONING SPECIFICATIONS l g Connecting rod bearing bore diameter 2 2247 inch 3O2 327 35O exc 400 2 2252 Main bearing bore diameter 2 0406 inch 302 327 350 EXC 400 L 2 6415 Ov I 4 l0 ll 16 70 1