[rvator9a]

Does anyone know if an 290d2 crank will fit an 320 narrow deck case? I am aware it has a flange with lightening holes, but my intent is to build a 150 hp motor. Can I use the 290 crank?

 

[moosepileit]

I think the 290-D2 crank is 10# lighter than the 320. Also the 290 sump is a 3" bore carb, the 320 a 4 inch.

Fly cutting a 290 case for 320 cylinders and sumping a 4 inch carb is a cool mod, and adding the breather on the back of the case to stop the 290's front cam sling overboard
pushes a lot of power for the weight to
strength- not your case, pun....

Mahlon?