bigbird241

can I put a 502 crank and rods in a 454, both are gen V. Im just looking to upgrade to forged. mercruiser shows a different part number for cranks.

Jonesyfxr

iTrader: (1)

I'd say as long as the mains are the same size the crank should fit. The block may need to be clearance for the counter weights though.

bigbird241

so, it has bigger counter weights?

Unlimited jd

iTrader: (5)

They are the same. Both 4" stroke, same main size, same rod size. Both external balance.

bigbird241

ok, Im taking your word on it and going to install in my 454. thanks

Jonesyfxr

iTrader: (1)

I know my 509 Eagle crank has a bigger stroke, wasn't too sure on the 502.

PS. Where's the pictures?

Unlimited jd

iTrader: (5)

Ummm you might want to check again. A 502/509/515 are typically 4.47/4.5/4.53 bore x 4" stroke, and a 454/460/468 are 4.250/4.280/4.310 x 4" stroke. So unless you did a huge over bore on a 454 with a 4.25" stroke your 509 has the same 4" stroke as a 454

TylerBurich

The 502's have more counterweight due to the heavier pistons of a 502 bore of 4.466"

Unlimited jd

iTrader: (5)

Casting number 14097044, gm forged 4" stroke 1 piece rear main crank 454/502 gen 5/6
http://www.mortec.com/cranks.htm

TylerBurich

I stand corrected, was 99.9% positive on that one lol.