18,000 orig. mile 318 build

LD-340 is a great manifold on a 340 or 360
Ports are too big for 318 - leave a lip at the manifold/ head interface.

The similar manifold for a 273 or 318 is an LD-4B - best manifold for this motor IMO

If you ride has air conditioner that you are keeping an LD-4B won't work use the performer