SBX

iTrader: (1)

Looking at the GMPP 502ho crate engine it appears to be built very similar to a boat engine if not almost exactly. There's an old guy here in town that purchased one new to put in a nova. Drove it about 200 miles over the last two years and decided he wanted to to Efi. Pulled the engine as is going the LSx route. I can pick the engine up for $3500 carb to pan. 850 demon carb msd hei dist and msd 6al.

Is this a good engine for a 25 outlaw as it is? Cam ok? I will post some pictures of the specs. If you want to google "gmpp 502ho crate engine" it will pop right up.

253

I bought a brand new one in 2002 for my then 253 Checkmate, it was a great improvement, and a great engine, ran it 7 summers w/ no problems at all, it had very good power and performance for your size boat, sounds like a good deal.

HTRDLNCN

$3500 for a basically new complete 502ho?
Id be at his door picking that bad boy up...

SB

iTrader: (1)

Wow ! Great deal ! You have it already don't you ? LOL.

Budman II

iTrader: (1)

Just make sure you have the correct bypass valve installed in the oil filter pad, so you don't bypass your filter and cooler and cook you bearings. Do a search on the subject on this forum - lots of info.

Biggus

iTrader: (1)

A friend had a pair of them in his boat, ran flawlessly for years and still running. Years back, I bought a pair of 454HO crate motors for my 33 Fountain. Zero issues. -As above check the oil bypass valve (or just block it) in the filter pad so the oil does not by-pass the cooler.

hullofjustis

iTrader: (1)

my buddy always recommends replacing the push rods. with a beafier one, however it is more precautionary.

mach1magnum

i would think that it needs marine distributor marine carb and some type of aftermarket exhaust stock exhaust wont work with that cam will it?

Budman II

iTrader: (1)

230* exhaust duration with a 112* LSA might be borderline with stock Merc manifolds, but I recall kidnova running the more aggressive ZZ502 cam with stock exhaust and I think it lived. I'm sure if I tried it with my luck the damned thing would suck water like a straw.

hullofjustis

iTrader: (1)

yea i do not recommend running stock exhaust with any engine and would use some sort of aftermarket ignition msd, crane etc.