45" WLDR Aluminum Cylinder Head Set for Harley Davidson

High compression 1:6.
Fits all WL models.
To maximize performance, heads should be combined with +1/8 Large Bore Intake Valves (971199) and WLDR Camshaft Kit (971250).
Replaces OEM 16681-39, 16683-39, 9-39 and 10-39.

Fits: > 37-73 45" WL Flatheads; OEM replacement for 37-41 WLDR racers