Bad Memorial day
 

Here are some pics from about 45 minuets after my boat broke down and some from this afternoon after I pulled the heads off. The motor is a mercury racing 500 bulldog and I was wondering where the best place to get a new block would be I am also having some trouble finding out if the block is a 502 or a 454 talldeck any help would be great

I thought the bulldog 500 hp was 540ci

that's right... HP 500 = 502 c.i. at 470 hp

Bulldog are 540 c.i rated also 470 hp or 500 hp I can't recall

YEP,,,and i don't think this would be a thin wall like that either on a talldeck /Bulldog Block ?????

Some thing is not right !!:party-smiley-004:

Looks like a over bored standart deck 454/502 to me ?!:eek:

Can u post a picture of the front of the block ?????

That way i can see what it is ?! maybe ?! LOL

Front Of Block
 

I dont know if you can tell from this pic if not let me know and I will get some more tommarrow also ran the number stamped on the block and it says it is a 454t block

YEP,,454 talldeck bowtie ( truckblock )

U can find one for around 3000 + if u are lucky !!!!:eek:

Call this guy , STEVE 954 240 1074 !!!

I know he has some of them ,,but don't know if he is willing to sell !!

They are hard to find !

( u can tell by the little oiler tube in front above the WP ),,the one with the allen plug in there !

You can quickly identify it at the upper waterpump bolts. On a shorty, the distance from the upper waterpump bolt to the deck of the cylinders will by ~0.200", and the tall deck is ~0.600", The difference is 0.400"

The tall motors have longer rods, which produce more torque - not noted for revs. Pushrods are also longer.

I don't think the 454 was ever offered in a tall deck - the 366 and the 427 were offered both ways, but I think the 454 and all later Mark IV blocks are all short deck, but not sure.

I have a friend with 2 502 bowtie tall deck blocks if that helps you out. If you need them shoot me a pm.

Frank

I have some stuff coming off the dyno next week that you might be interested in that would be turn key, and priced right. I am up in Conroe. Engines are down at Owens right now. PM me if you are interested. I can tell from the pics that your rigging would work fine on them.

Dude, talk to a machine shop. They may be able to sleeve that block.... save you about $2500.

VV,,,,,the 454 was offered as a talldeck ( 454 TRUCK BLOCK )

Is exactly what he has ,,,and there the only ones with the oiltube in front !!!!! And it is a Gen IV !!!!!!

Sorry about your engine.
I would not suggest spending the $$ for another tall deck 454 block. You can likely use your stroker crank in a short deck 454 or 502 block with the right combo of rods and pistons.
If not, I'd suggest buying an assembled 502 shortblock and use your heads.
You will need a new intake with a short deck block but that can be had for under $200.

I feel your pain!! I trashed a motor last month!!

Like mentioned above, if the rest of the block checks out ok, you can have it sleeved. If it is done right, it will last!!!!

Good luck!!

I thought the 454 tall deck blocks were Bowtie and Gen V but with the Gen IV blocks were either 427 or 366 truck engines. Maybe if he posted the casting numbers we could sort this out.

They are BOWTIE <<<,,,but Gen IV !!!

The tall deck engines are awesome for reliability. They allowed the big trucks to use a taller piston so that they could add rings, and change the rod angle so they were better suited to running down the highway at high rpms for thousands of miles. Some of thise engines would go 250000 plus miles in a dump truck truning 3500-4000 shifting gears all day long.

Perfect for the marine world, just hard to find. If I were going to spend that much cash, I would just switch over to a tall deck aftermarket block. Then yo ucould have a tall deck 502 or whatever bore yo uwanted engine and really have a beast. Crank and rods would be the same. You are all ready buying pistons and a block, and the rest of the stuff goes on top. There might even be a taller piston out there somewhere.

Seriously good way to build an engine. Crank in the tall deck 454's etc were still 4".

If this is the case, there is nothing I'd reuse from the blown shortblock. I'd build or buy a 502.
If you have the extra cash to build a tall deck then a 540.
The boat is for sale though so...

sell your blown motors parts and buy a new or newer take out i,ve had a lot of boats rebuilding a marine motor is hard because the load on the motor and the high rpm if it,s not perfect the motors keep shaking apart you might get a couple of runs but you,ll allways be working on it

Casting Number
 

The casting number is 14044807 also I have the numbers off of the cam and the pistons if anyone could help me figure out what they are the numbers on the cam are CR13H000036 , 200486, AND 13-18-00 the number on the piston is 6063AS the crank is a Lunati and the numbers on it are BB421,L1722D6, 4.375, 2575GM

14044807...454T..............4-bolt, Bowtie, MkIV, CNC prep, Tall deck, 4.25" bore or 4.495" bores

Pistons should be dish aluminum.

Pro Series crankshaft
Stroke: 5.300 in.
Main Bearing: 2.750 in.
Rod Journals: 2.200 in.
Minimum Rod Length: 7.200 in.
Rear Main Seal: 2-piece
Nice crank, about 2G's

If that is the crank that is in that engine it night be a good one, but hly hell that is a long stroke to be putting in that block.

I would never go bigger than 4 3/8 and that is pushing it

Go back down to a 4.25 crank and a flat top piston. You'll have much better results over all.

No wonder it came apart.

if the block is not split it can be fixed

Thats what i was thinking.:party-smiley-004:

Also a Bowtie talldeck is better then the dart or merlin blocks !

I just like them .:eek:

No it's not. They are old technology. Good blocks, but not as good as a modern DART

Cam
 

Thanks for your help guys I am still having some trouble with the cam though the numbers on it are CR13H000036, 200486, 13-18-00 and here is a link to the lunati web site for my crank what is the stroke is it 4.375 or 5.300 again thanks for all the help

If it really was a 454, then it is a 4". If it is any of those others, then it is a bigger engine than 454

4.25 crank would have made it a 496+- depending on the overbore.

Anything bigger than that is worthless in that engine IMO.

Take the whole pile of iron to a machine shop down there. OWENS is probably the better one down there and let him TELL you what you have and make a decision on wether to mess with putting it back together based on real info and not speculation off of this board. He is up in Pearland. There isn't any other shops down there that I would trust with anything.

He will shoot you straight. If you need parts, I got a whole shop full of them. I got some engines down there right now also if yo uwant to look at some of them. He is running them on his dyno.

Find out what parts you have from him and I might take what is still good in on trade from you.

Jeff,,,i call BS on that.
My engine is a standard deck Bowtie 454/509, with 4 " crank and 4.500 bore.
And still have room to go .90 over !!! easy.
U can easy build a 572 out of mine so a 620 out of a bowtie talldeck would be no problem.
The bowtie's are siamese bored blocks ,,i think the new ones are not ?!
The biggest crank i ever seen in a bowtie talldeck was 5.25 " stroke. Still running.

mmmmhhhhh.........................
I say fix the block and go with an engine builder that knows what he is doing.

572 out of a standerd deck block?

Yep !!!!!:eek:

Sometimes, just because something CAN be done, doesn't mean that it SHOULD.

Rememebr that.

OH,,,i agree,,,i am not saying i would ,,,but it can be done !!!:coolcowboy:

The 500HP, 540 cube Bulldog did use a Bowtie block and Lunati crank. The stroke is most definitely 4.375. The bore would be around 4.43 to make 540 cube.
I don't think you can put that crank into a standard deck GM block.
I suggest you try and have the block sleeved. Buying a new block is going to be big $$.
It all depends on how much you want to spend on a boat that is for sale.
If you do really want to sell the boat the easiest and least expensive thing to do is buy a "take-out" running engine or buy a shortblock 502.

Here's what I found doing a quick google...

HP500 Bulldog Specifications

Propshaft Horsepower: 470 (350 kw)
Displacement (Liter/CID): 8.9/542
Cylinders: V-8
Bore (in/mm): 4.44/113
Stroke (in/mm): 4.375/111
Compression Ratio: 8.6:1
Fuel Requirements: 87 Posted Octane (R+M)/2
Full Throttle RPM Range: 4800-5200
Ignition Type: Thunderbolt V
Alternator (amps/watts): 55/776
Length (in/mm): 47.5/1207
Width (in/mm): 32.75/648
Height (in/mm): 25.5/648
Weight (lbs/kg): 1540/699
Warranty: 1-year limited, 3-year limited corrosion

500 bulldog
 

Thanks for the help I took the motor the the engine shop today getting the block sleeved and the heads crank etc all checked out and reballanced

Who did you take it to? Always curious as to who else is out there doing thi kind of work?

500 Bulldog
 

I took it to houston engine and balancing in pasadena

Can you PM me their pricing sheet?

That's good news.
Are you going to put the same cam back in?
If you have a little extra, you may consider bumping the compression and installing a good hydraulic roller cam.
9.5: 1 and a cam simmilar to the 525EFI cam will give you another 50-75HP and still idle around 800rpm.
Good Luck with your project...