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

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

Aluminum front & rear head set. 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. Heads come with 126cc capacity, for stock compression. Heads can be milled .070", which makes them equivalent to stock high compression heads. Head sets include front & rear head and a head gasket set. Note: Spark plug hole is 18mm threaded so stock style large spark plugs can be used.

Fits: > 37-48 80" (1300cc) Flathead B.T.; 37-48 74" (1200cc) Flathead B.T. when converted to the larger 80" bore (NU)