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Top End
Cylinder Heads
for Knucklehead
S&S Cylinder Heads for Knucklehead

S&S Cylinder Heads for Knucklehead

Fine reproductions of Knucklehead cylinder heads to replace your worn originals or to build your bespoke custom engine. They perfectly handle larger displacement engines but also work well as a high performance upgrade for 61 cui. and 74 cui. engines. These heads have the late style big port intake flanges, as original for 1940-47. Valve seats are hardened for the use of today’s unleaded fuels and sized for stock 1.750” Ø exhaust and larger 1.940” Ø intake valves, but not machined. They feature stock 18 mm spark plug threads and a stock head bolt pattern, however, the head bolt threads are changed to UNF 7/16”-20 so you can use more common Panhead/Shovelhead head bolts. Valve guides for S&S aluminum valve spring covers are included, but not installed.

  • fits OHV models 1936-1947
  • cast iron, black, painted
  • nominal bore: 3-7/16 ”
  • exhaust flanges G: Knucklehead
  • head bolt pattern: Knucklehead
  • intake manifold flanges: Knucklehead plumber type (1940-1947)
  • oil supply: external
  • plug threads: 1 x M18 x 1.5 x 12.7 mm
  • with intake manifold nipples and valve guides
  • replaces OEM 16700-40, and 16697-40
  • USA
Item №
net price*
Availability in warehouse Germany
S&S Cylinder Heads for Knucklehead
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* United States of America: Tax free shipping. Please check your local import fees.

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