Complete 74" Top End Replacement Kit For 1966-'78 Big Twins With O-ring Heads
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Complete 74" Top End Replacement Kit For 1966-'78 Big Twins With O-ring Heads

Item #: 90-0097
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Features & Benefits

  • Provide everything you need to replace the top end of a 74" 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.

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74" engines have a stroke of 331/32", and 80" shovelhead engines have a 4¼" 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 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.