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Old 08-01-2004, 02:56 PM
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mercruiser 502 chevy questions

i found a mercruiser 502 4 bolt main long block, fresh .030
" bore job, decked .010", 088 square port "ported" heads, with a valve job, & a .010"-.010" steel crank. the only thing it needs is a set of .030" over pistons, cam, & a intake. $2650 bucks. is it worth it, & what kind of horse power do you think i could get out of it on 10.5 compression, & a 265-270 @.050" with .600" lift solid cam?

is there any difference between a marine block, & a regular car block? i've been told the boat motor has more nickel content, & thicker cylinder walls. is this true?

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Old 08-01-2004, 03:23 PM
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around 600 hp with a good manifold and a 850 carb.
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Old 08-01-2004, 07:18 PM
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502 Marine is the same block as 502 production blocks. Tho they claim they are "selected" blocks because Mercruiser is a bit picky on quality. The gasket set is higher quality. Some marine applications run the engine backwards with a different cam gear and cam grind.
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Old 08-01-2004, 09:48 PM
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Re: mercruiser 502 chevy questions

Quote:
Originally posted by 406 ss monte
i found a mercruiser 502 4 bolt main long block, fresh .030
" bore job, decked .010", 088 square port "ported" heads, with a valve job, & a .010"-.010" steel crank. the only thing it needs is a set of .030" over pistons, cam, & a intake. $2650 bucks. is it worth it, & what kind of horse power do you think i could get out of it on 10.5 compression, & a 265-270 @.050" with .600" lift solid cam?

is there any difference between a marine block, & a regular car block? i've been told the boat motor has more nickel content, & thicker cylinder walls. is this true?
I got 663 hp out of ZZ502 with a decked block (10-1 cr), ported gm oval port heads and a solid roller around 615/630.
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Old 08-02-2004, 09:11 AM
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is the engine i found worth the $2650? all it need are cam & lifter kit, intake , & pistons.
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Old 08-02-2004, 09:33 AM
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It sounds fair...you are getting crank, block and heads...assuming everything there is good, it's cheaper than buying a new basic 502. Are they including rods?
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Old 08-02-2004, 09:44 AM
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When you get the pistons, measure them and the bores carefully. Aftermarket manufacturers can't make up their mind on the 502 bore sizes. The bore spec is 4.4655"-4.4662". Aftermarket manufacturers list it from 4.4680"to 4.470", etc. This is a good case to have the pistons in hand before boring and honing.

tom
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Old 08-02-2004, 09:55 AM
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Quote:
Originally posted by Miket
It sounds fair...you are getting crank, block and heads...assuming everything there is good, it's cheaper than buying a new basic 502. Are they including rods?

i'm getting everything, but pistons, intake, & a cam.

it includes fresh bored block, fresh turned crank (steel), forged rods, 088 heads that have been ported & a fresh valve job, & the oil pan.
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