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74" Top End Kit

Dealer Only Item

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S&S has something for shovelhead engines that have given many years of service and are now in need of a new top end. In a lot of cases it just isn’t worth it to try to rebuild the old, cracked, worn out cylinder heads or to bore the stock cylinders again. S&S now offers top end kits that provide everything you need to replace the top end of a 74” shovelhead engine in 1966 – ’84 Harley-Davidson® models. 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, S&S cast 8:1 compression pistons complete with rings and wristpins, manifold clamps, manifold seals, all required hardware, and gaskets. The 74” top end kits include S&S 92-2500 series 3-31/32” stroke pistons and o-ring style cylinder heads. Pistons are pre-fit to the cylinders, so there is no machine work to be done and very little down time. Just build your engine! NOTE: 74” engines have a stroke of 3-31/32”, 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 which results in 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 combination 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.
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