ENGINE SECTION RED PART NUMBERS INDICATE NEW PARTS 6-134 1 2 3 4 5 6 7 8 9 10 11 CONTENTS REFERENCE GENERAL EXHAUST FUEL DRIVE TRAIN ENGINE WHEEL CONTROL FRONT END FRAME ELECTRICAL PERFORMANCE HEAD & BASE GASKET SETS FOR BIG TWIN & SPORTSTER EVOLUTION • Designed to eliminate sealing problems found in high compression engines. • Sets include .010” soft aluminum base gaskets, solid malleable copper head gaskets with thickness as listed and Viton O rings. Big Twin Evolution 1340cc, (3 1/2”) 1984/1999 Sportster Evolution 1200cc, (3 1/2”) 1988/Later Big Twin Evolution 3 5/8” Bore, 1984/1999 Part 60421 Part 60419 Part 60420 Part 60490 Part 60489 .043” Head Gasket .043” Head Gasket .043” Head Gasket .027” Head Gasket .032” Head Gasket Head & Base Gaskets Model & Year Bore Size Thickness Part # Big Twin Evolution 3 1/2” .030” 62605 1984/1999, (standard) .040” 62606 Sportster, Evolution 3 5/8” .030” 62607 1200cc 1988/Later (Big Bore) .040” 62608 3 13/16” .030” 62609 (Big Bore) .040” 62610 3 3/4” .030” 62611 (Big Bore) .040” 62612 4” .030” 62641 (Big Bore) .040” 62642 Model & Year Bore Size Thickness Part # Twin Cam 1999/Later 3 3/4” .030” 62626 (Standard) .040” 62627 3 7/8” .027” 62640 (Big Bore) .030” 62621 .040” 62622 .045” 62637 .051” 62638 .060” 62639 Milwaukee-Eight® 107” 3.937” .030” 60423 Milwaukee-Eight® 107” 3.937” .040” 60422 Milwaukee-Eight® 114” 4.000” .030” 60431 Milwaukee-Eight® 114” 4.000” .040” 60430 HIGH PERFORMANCE HEAD GASKETS FOR EVOLUTION & TWIN CAM • Extreme Sealing Technology (EST) will eliminate head gasket problems. • MLS - Multi Layer Steel. • These are the best that we have ever seen for everything from 8.5:1 compression ratio up to 15:1 plus. • To ensure the utmost sealing power, the outer layers are embossed at the cylinder bore and the oil drain backs provide a seal so good that O rings are not required. • Distributes heat exceptionally well from the head to the cylinder, thus eliminating hot spots that would normally cause a head gasket failure. • Sold in pairs. MLS Type
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