Is there a way to tell if the engine is the 310hp or 250hp version by looking at it?
I know the 310hp came with 4bbl but there is no sticker on the oil fill tube.
Shawn

 

Well, obviously if the intake and carb are original, the 310 HP motor is a 4bbl and the 250 HP motor is a 2bbl. Of course, these can be easily changed. The better way to tell is to pull a spark plug and use an inspection camera to look at the piston. The 250 HP motor has 9.00:1 CR and a large dish in the piston. The 310 HP motor has 10.25:1 CR and a minimal 6cc dish in the piston.