S&S Cycle

1926–'84 vintage engines

TOP END REPLACEMENT KITS FOR 1966–'84 BIG TWIN ENGINES

1984–1999 Evolution ® 1926–1984 Vintage Engines Tools & Shop Supplies Warranty & Company Policy Appendix & Index

FITMENT • 1966–'84 big twin engines FEATURES AND BENEFITS • Provide everything you need to replace the top end of a 74" or 80" shovelhead engine. • S&S top end kits for shovelheads include a set of S&S Super Stock® cylinder heads, a pair of S&S® stock bore cylinders (37/16" for 74" and 31/2" for 80"), S&S 8:1 compression forged pistons, complete with rings and wristpins, manifold clamps, manifold seals, all required hardware, and gaskets. • 74" top end kits include S&S 106-5495 series 331/32" stroke pistons and o-ring style cylinder heads. • Top end kits for 80" engines include the S&S 106-5511 series 41/4" stroke pistons and rubber band style cylinder heads. Pistons are pre-fit to the cylinders

TOP END REPLACEMENT KITS FOR STOCK DISPLACEMENT SHOVELHEAD ENGINES

High Temp Gloss Finish Part #

Displacement

Model Year

Stroke

Compression

90-0097

74" 80"

1966–'78 1979–'84

331/32 41/4"

8:1 8:1

90-0098 DISCLAIMER: NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLE. NOT LEGAL FOR SALE OR USE NATIONWIDE ON ANY FEDERAL POLLUTION CONTROLLED MOTOR VEHICLE UNDER THE CLEAN AIR ACT

NOTES: 74" engines have a stroke of 331/32", and 80" shovelhead engines have a 4 " stroke, but the cylinder length for both engines is the same. The 74" piston is taller than the 80" piston; piston deck heights of the two pistons are designed for the same piston to head clearance in both engines. While it is possible to install an 80" top end on a 74" engine, this will result in very low compression and poor performance. A 74" top end will bolt to an 80" crankcase, but, the pistons will contact the cylinder head due to the com- bination of the taller 74" pistons and the longer stroke of the 80" flywheels. Therefore, it is important to correctly identify the stroke of the engine before ordering a top end kit.

90-0098

Top it off with S&S billet rocker boxes. See page 160

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