1994 350 MAG, roller cam or not?
 

Can anybody tell me if my engine is roller cam or not by the engine serial number? I'm hoping it's already a roller because it will make this winters project much easier. Serial number is 0F123708

I've tried to look it up and I get a listing for either or. Hoping somebody that knows a little more could maybe help me out

My 1993 350 Mag was equipped with a factory roller cam.

all GM / Marine in model year 1997 went to roller lifters except the 3.0 / 4 banger in which still is flat tappet. FYI

Your info - if you have OEM Stock app from Mercruiser this is roller lifers / cam.
The same roller lifters were used by Mercruiser in the V-6 4.3 LX from 1987 - 1991 and the 5.7 LX and 350 MAG 1992 - 1995

FYI