tanned fat looks better

I have a 502 mag that was manufactured in 1990. This is not a Merc it's a Bow Tie. I was told that GM ran out of blocks to supply Merc so they gave them a higher performance version of the 502 and kept it quiet. This motor has some different stuff too like bigger oil cooler, brass Jabsco sea water pump and such. I have no clue and am no gear head. I got these numbers off the back of the block stamped above the bell housing. Can somebody tell me what I have. #10051107

Thanks
Bryan

Back4More

http://www.mortec.com/bbc.htm
10051107...454...............4-bolt, Bowtie, MkIV, 9.8" deck, siamesed cylinder barrels, 4.25" semi-finished bores, can be bored to 4.500"

US1 Fountain

iTrader: (1)

Shouldn't there be either 8.2 or 7.4 cast in raised numbers on the side of the block to be able to reconfirm whether it is a 502 or a 454?

My '94 502 had the 8.2 casting.

David

That block casting number should have a raised "bowtie" emblem on the side of the block.

tanned fat looks better

Thanks I will look for a Bow tie and or 8.2 or 7.4. The Merc tag has is not welded on it is screwed in, like I say this wasn't an original merc the tag # is D602746 (502 Merc)

tanned fat looks better

It runs great now it's got a Dart high rise manifold, Stainless Marine exhaust, 830 Holley but I don't have a clue of what's inside. I wish I knew so if I ever want to do anything else I'd know what to order. It's a 270 Baja the Holley is not marine so we re-jetted it to 500hp carb specs and I picked up 1.6 mph and better idle. I've gotten 67.8 mph gps @ 4950 rpms I didn't think that's too bad.