[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?

[tresi]

around 600 hp with a good manifold and a 850 carb.

[BOBCRMAN@aol.com]

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.

[Miket]

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.

[406 ss monte]

is the engine i found worth the $2650? all it need are cam & lifter kit, intake , & pistons.

[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?

[machine shop tom]

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

[406 ss monte]

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.