Best way to get 500 hp out of a 502 mag
12-22-2003, 07:13 AM
#22
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Originally posted by mcollinstn
saltwater and aluminum don't mix well.
saltwater and aluminum don't mix well.
It can be done.
12-22-2003, 10:49 AM
#23
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Originally posted by epeek
Just a dumb Question, but I've seen 502/502's for
sale at Danbury Marine for 6500. Has anyone used
these engines? Just seems like, anyway you slice
it, I'm lookin at 6 grand per engine. Might as well
have 2 brand new engines pushing 500 H-P,
and keep my old ones for spares.
Just a dumb Question, but I've seen 502/502's for
sale at Danbury Marine for 6500. Has anyone used
these engines? Just seems like, anyway you slice
it, I'm lookin at 6 grand per engine. Might as well
have 2 brand new engines pushing 500 H-P,
and keep my old ones for spares.
12-22-2003, 08:37 PM
#24
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Originally posted by ursus
Cam, carb, exhaust and intake manifolds more like 3k/engine not 6k if 500hp is still your target. Even if you were to get a decent marine crate engine for 6500 would would still have another 1500 to add for exhaust to that don't forget.
Cam, carb, exhaust and intake manifolds more like 3k/engine not 6k if 500hp is still your target. Even if you were to get a decent marine crate engine for 6500 would would still have another 1500 to add for exhaust to that don't forget.
They run great & don't use any oil ( 1 qt per 15-20 hrs,
Excellent for a 502) But I'm wondering if they will
need to be refreshed before juicing them up.
12-22-2003, 08:39 PM
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Originally posted by mcollinstn
saltwater and aluminum don't mix well. The 502/502 has aluminum heads.
Dart single plane marine intakes and Mercruiser aluminum dual plane intakes have bronze liners in their water passages for corrosion resistance.
saltwater and aluminum don't mix well. The 502/502 has aluminum heads.
Dart single plane marine intakes and Mercruiser aluminum dual plane intakes have bronze liners in their water passages for corrosion resistance.
any experience with the ZZ502?
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05-13-2004, 12:43 PM
#27
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Epeek, I don't know how many hours you have on your engines or how hard you punish them, but the BBC will live a long time with the proper PM. Exhaust, however, is another question. The mercruiser cast iron manifolds are, without a doubt, the biggest POS in the whole engine package. They have a nasty habit of leaking internally at the manifold/riser joint. The problem is by the time you see it leaking externally, it's probably been leaking internally for some time. It will flat wreak havoc on your heads with water sitting in the exhaust ports. Could even lead to a total hydraulic lock on the engine if enough water begins to find it's way in. If I were going to begin with anything, it would be manifolds/headers whether you change engines or not. If you go with the longer winded cams you're going to need a better exhaust system anyway to cut down or eliminate reversion
