S&S, FLATHEAD 80" BIG TWIN CYLINDER HEAD, FRONT

S&S, Flathead 80" Big Twin cylinder head, front

Aluminum front head only. Fits all 37-48 74" side valve engines when converted to 80" (larger bore) and all stock 80" engines. Aluminum heads were stock on 40-41 80" engines, and optional for others. Head has 126cc capacity, for stock compression. Head can be milled .070", which makes it equivalent to stock high compression head. Note: Spark plug hole is 18mm threaded so stock style large spark plugs can be used. Note: See 531673 for rear head only and 531671 for front & rear head set.

Fits: > 37-48 80" (1300cc) Flathead (NU)