Is this a Bulldog motor?
 

Can you tell from the pictures if this is a bulldog motor? What are some things to look at to verify besides getting a serial number?

Thanks

http://rochester.craigslist.org/bod/4555063630.html

Well it looks like a Chevy Hi-Perf. ZZ502 to me...

Its not a stock bulldog you will have to investigate it shoudl be a 540 cubic inch block to be a true Merc Bulldog if I remmeber they also made an HP 500 but it was not with the 540

Is that a marine motor? The dealer got the boat at auction and doesn't know the history, but is advertising the bulldog.

Thanks

This is an HP500 Bulldog from back in the day:
[ATTACH=CONFIG]527252[/ATTACH]

It could be, but you would have to look up the serial number.
Check here: www.mercruiserparts.com

It LOOKS like something out of the GM Performance motors lineup.

http://www.summitracing.com/search/p...69887%2B400129

Car motors are a lot tighter than boat motors. Car motors run at much lower RPMs vs. boat motors. You would need build specs to know exactly, but it could be a very solid platform. I have a bone stock ZZ502/502 in my jet boat, but I don't run it on the ragged edge either.

A Bulldog is a tall deck motor. If this isn't, it's not.

Hmmmm, I thought it was a stroked & bored 9.8

Bulldog is a tall deck 4.375 stroke and 4.440 bore = 540ci .

Maybe this guy has an animal that's a bulldog. Thats a GM performance crate engine from the auto performance side..

I use to see the Bulldog motor back in its day but only about twice a year. I know all the OEM factory stock specs.

540 CID - 8.9 L

compression ratio 8.6:1 I think for earlier motors and later motors was 8.75:1 - I could be wrong about the 8.6 to 1

Bore & stroke 4.44 x 4.375 or 112.7 x 111.1 mm for you metric guys

Merc recommend 87 octane fuel

Merc said propshaft hp was 470 I found that hard to believe because the HP 500 NON Bulldog had the same HP.of 470

Even in the late 90's GM Mark IV tall deck "bow tie" cast iron block

4 bolt mains

Manley forged steel connecting rods

Lunati forged steel crank - 4 bolt mains

Wiseco Forged aluminum pistons - Yes Wiseco pistons

Speed Pro piston rings

Crane performance hydraulic roller cam

crane hydraulic lifters

Manley heady duty pushrods

Crane roller rocker arms

Crane valve springs the dual coil type - the weak link

Crane retainers

Dart aluminum single plane intake manifold

Holley 800 CFM Marine 4 bbl carl

GM Heads cast iron with 3 angle valve seats

Stainless steel intake valves same as the HP 500

Inconel exhaust valves same as the HP 500

diameter I would have to look it up of the valves but I remember it is the exact same and the GM heads that the HP 500 used.

Gil made exhaust for Mercruiser

Carter fuel pump - did not use the belt driven combo fuel pump / impeller pump like the HP 500 because of the Gen V & IV no fuel pump boss on the side of the block

Melling High volume oil pump

cast aluminum oil pan - forgot the capacity - If I remember correctly it was way more than the HP 500 - 8 qt stamped steel GM oil pan. I want to say 12 qts. if I recall correctly.

Mercruiser T-bolt V ignition system and like all T-bolt V's it did have the built in REV Limiter.

Mercruiser also claimed Blueprinted internal components of the Bulldog engine.

RPM range of 4800 - 5200

Hope this helps and did I forget anything ?