ENGINE SECTION RED PART NUMBERS INDICATE NEW PARTS 6-125 1 2 3 4 5 6 7 8 9 10 11 CONTENTS ELECTRICAL FRAME FRONT END CONTROL WHEEL ENGINE DRIVE TRAIN FUEL EXHAUST GENERAL REFERENCE Model & Year Bore Size Thickness Part # Big Twin Evolution 1984/1999, 3 1/2” .030” 62605 Sportster, Evolution 1200cc (standard) .040” 62606 1988/Later 3 5/8” .030” 62607 (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 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. Head & Base Gaskets MLS Type BASE GASKETS FOR EVOLUTION • The Evolution engine has been known to have problems with the paper type base gaskets leaking. • Cometic has solved this problem once and for all with their nitrile bunadine rubber (NBR) coated stainless spring steel base gaskets. • Designed to conform to the extreme expansion and contraction rate of the cylinder. • To further enhance the sealing quality, the gaskets feature a raised edge at the cylinder spigot circumference and at the oil drain back hole. • Available in your choice of thickness to help tailor fit your desired compression ratio or piston deck height. • Sold as front and rear set. Cylinder .010” .020” Model & Year Size Thick Thick Big Twin Evolution 1984/1999 OE Bore 60424 60427 3 5/8” Big Bore 60433 60436 Big Twin Sportster Rubber Coated Stainless Steel
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