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.
ExcessiveBehavior
Crane 741, MSD, Holley 850 Mech secondarys, Don't need larger valves. Do the port work and flow work on the heads. Isky tool steel springs, Inconel exhaust valves, Roller rocker/lifters. make sure that deck is flat with good quench. With the proper head work, you shouldbe looking at high 500 HP. Dump the GM heads for AFR or such, and you will be in the 600 HP range.
DONT DO IT !!!!!!!!!! Do you head work and cam change. Get you ECU remapped and keep the MPI.
You have a good system there. KEEP IT !!!!!!
You have a good system there. KEEP IT !!!!!!
With a single plane intake you should run a mechanical secondary carb. An 850 should prove to be a little better choice than the 800 on a 502 with cam over 225 at .050 and running 5200-5400rpm at WOT.
Camshaft choice depends on what exhaust you plan on running (reversion issues) and exactly what head or head mods, intake, carb, weight of boat, and what type of driving you want to improve upon.
If you keep MPI - talk to programmers (ie: azspeed.com or etc) to find what parts / mods you can add that they can program for. Do what they have already programmed for - do not do stray from this. If you do they will provide their best guess and that will leave you to determine if it is correct or not. Do you have the abilites / hardware / software to determine this + give them all the info they need to reprogram if it is off? Probably not - stick with their 'tried and trued' stuff.
Oh, your Gen V does not have a mechanical fuel pump boss - your fuel pump is on the seawater pump. The Holley will not work on this. You can use your current mechanical pump with larger fittings or go to CP Performance and buy their 'Upgraded' assembly which is a higher gph 'valve/diaphragm assembly' - basically a upgraded lower half.
Camshaft choice depends on what exhaust you plan on running (reversion issues) and exactly what head or head mods, intake, carb, weight of boat, and what type of driving you want to improve upon.
If you keep MPI - talk to programmers (ie: azspeed.com or etc) to find what parts / mods you can add that they can program for. Do what they have already programmed for - do not do stray from this. If you do they will provide their best guess and that will leave you to determine if it is correct or not. Do you have the abilites / hardware / software to determine this + give them all the info they need to reprogram if it is off? Probably not - stick with their 'tried and trued' stuff.
Oh, your Gen V does not have a mechanical fuel pump boss - your fuel pump is on the seawater pump. The Holley will not work on this. You can use your current mechanical pump with larger fittings or go to CP Performance and buy their 'Upgraded' assembly which is a higher gph 'valve/diaphragm assembly' - basically a upgraded lower half.
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