502 EFI to Carb Conversion
 

I have been doing alot of research in the Tech forum (searches) about this conversion. I have a pretty good idea what I want to do, now I am looking for any other suggestions or comments. The boat is a 1994 Baja 272 502 EFI Gen V non roller motor. The boat runs a best of 69 mph GPS. These are my plans, pull off efi, Holley 850, Edelbrock victor jr single plane, Revolution Marine exhaust, Holley mech fuel pump, Crane HI-6M ignition w/ stock Thunderbolt 4 distributor, PS-92 Coil, pull heads, pocket port, larger valves 2.19/1.88, Harland Sharp roller rockers, and a Crane 731 or 741 cam. The motor was recently freshend up, about 50 hrs ago. OK, any ideas or concerns, would you go w/ mech. secondaries or vacume on the carb? Different size valves in the heads? Which cam? And what exactly is needed to convert my motor to accept the roller camshaft (obviously roller lifters, but which ones, part #?) Any round about estimates on HP, what about speed increase? Thanks in advance to all who choose to respond and help me out.

Thats going to be hole lot of work and $$$ to do to a fresh engine for minimal gain. I'm guessing a 3-4 mph gain. I'd think you'll be spending 3-4k for the mods you've listed. If it was me, I'd spend the extra money and just add a whipple to it.

BTW, the crane lifters are part #13532-16. You will also need new springs, retainers and push rods.

if you need a carb i have the 800dp holly carb(blue) that came on my hp 500.i had nickerson just build a custom carb for the procharger.

From what I have read from engine builders, a 502mag build up with the Crane 731 cam with make around 500HP.
To get more than that, you will need to up the compression and install larger valves.
Griff is right; it will take an additional 15-20HP for 1mph faster at the speeds you are all ready going.
Good Luck!!! and Happy Boating

Thanks for the replies so far.....keep em comin'


Jeff

whats cheap? why are side mounts cheaper