Is the new Mercury 8.2 L, 502 based on the same platform as the old 502 or is it a completely different engine that just happens to also be a 502?
Is the new Mercury 8.2 L, 502 based on the same platform as the old 502 or is it a completely different engine that just happens to also be a 502?
Lake St. Clair, Lake Huron, Lake Erie, Lake Oakland
Standard Gen VI block. same as the 525, etc.
"Standard Gen VI block. same as the 525, etc."
Wow, glad I got rid of my white elephant 496!
Lake St. Clair, Lake Huron, Lake Erie, Lake Oakland
If you go on GM's parts site, that's what they are........
standard Generation VI.
George Carter
Central Florida
gcarter763@aol.com
http://kineticocentralfl.com/
“If you have to argue your science by using fraud, your science is not valid"
Professor Ian Plimer, Adilaide and Melbourne Universities
"gm stopped casting the Big blocks and thats why the 496 is no longer in use,,i believe the block is casted from another source for mercury.."
It's my understanding that the 502 has always been a crate engine only. They are purchased and marinized by Mercury. Raw blocks are CNC machined in house for the Mercury Racing engines. I wonder how much cheaper they got the 496s for to make the change?
Lake St. Clair, Lake Huron, Lake Erie, Lake Oakland
GM officially shut down the Big Block MK VI production line for good just after the U.S. government "bailout" of GM.
This Big Block Chevy Tonawanda NY engine production line had been in continous operation since 1965 with the first the 396, 427, 454 MK IV , MK V 454,502 , & MK VI 502.
I don't know if the tooling & machine equipment was saved; or if someone else will start building these big block iron engines~~~I doubt it ?
Just before the line was officially shut-down for the very last time Mercruiser Marine took delivery a a very large batch of engines & parts ; as did GM performance for their dealer's over the counter performance catalog .
When their all gone~~~
I suspect they will be gone forever .
Last edited by silverghost; 01-19-2012 at 09:09 PM.
"BENCHSEAT 18" ~~YellowJacket~~ project owner~
1929 Chris~Craft 28' Tripple Cockpit Mahogany Speedboat / A-120-A 845 Cu.In. 375 H.P. Chris~Craft V-8 racing engine.
24' American Skier
Super Eagle 454 HO Skiboat
1991 454 SS Chevy Super Sport Pick-up for towing my "Toys".
There is no such thing as going too fast ~ ~~
OR~ Being too old~ for a new "Toy"!
Brad Hunter
Huntingdon Valley Pa (Just outside Philly)~
Ocean City NJ
silverghost1926@msn.com
215 947 4676 (PA Home)
If you look here, you'll see they (GM) are supplying BB crate engines in lots of flavors:
http://store.gmperformanceparts.com/...y=Big%20Blocks
Here the specs:
ZZ 502/502 Tech Specs
Block Part Number:
10237292
Block Type:
Cast iron with 4-bolt main caps
Bore x stroke (in):
4.47 x 4.00
Camshaft duration (@.050 in):
224 degree intake / 234 degree exhaust
Camshaft lift (in):
.527 intake / .544 exhaust
Camshaft Part Number:
12366543
Camshaft type:
Hydraulic roller
Compression ratio:
9.6:1
Connecting Rod Part Number:
10198922
Connecting rods Type:
Forged steel, shot peened
Crankshaft Part Number:
10183723
Crankshaft Type:
Forged steel
Cylinder head Part Number:
12363390
Cylinder head Type:
Aluminum oval port; 110cc chambers
Displacement (cu in):
502
Engine Name:
ZZ502/502 Base Engine:
Engine type:
Chevy big-block V-8
Ignition timing:
8 degree BTDC @ 800 rpm; 36 degree total @ 5000 rpm
Maximum rpm:
5800
NOTE:
Distributor with melonized steel gear MUST be used with long blocks and partial engines with steel camshafts, or engine damage will occur. GMPP distributor P/N 93440806 is recommended.
Piston Part Number:
12533507
Pistons Type:
Forged aluminum
Recommended fuel:
92 octane
Rocker arm ratio:
1.7:1
Rocker arms Part Number:
12368082
Rocker arms Type:
Stamped steel
And they're available from $7,200.00 w/aluminum heads..
Valve size (in):
2.25 intake / 1.88 exhaust; stainless steel
George Carter
Central Florida
gcarter763@aol.com
http://kineticocentralfl.com/
“If you have to argue your science by using fraud, your science is not valid"
Professor Ian Plimer, Adilaide and Melbourne Universities
Here's one w/iron heads and a lower C/R:
These are available for about $6,500.00.
502 HO Tech Specs
Block Part Number:
10237292
Block Type:
Cast iron with 4-bolt main caps
Bore x stroke (in):
4.47 x 4.00
Camshaft duration (@.050 in)
211 degree intake / 230 degree exhaust
Camshaft lift (in):
.510 intake / .540 exhaust
Camshaft Part Number:
24502611
Camshaft type:
Hydraulic roller
Compression ratio:
8.75:1
Connecting Rod Part Number:
10198922
Connecting rods Type:
Forged steel, shot peened
Crankshaft Part Number:
10183723
Crankshaft Type:
Forged steel
Cylinder head Part Number:
12562920
Cylinder head Type:
Iron rectangular port; 118cc chambers
Displacement (cu in):
502
Engine Name:
502 HO:
Engine type:
Chevy big-block V-8
Flexplate Part Number:
10185034
Flexplate Size:
14"
Ignition timing:
36 degree total @ 3600 rpm, with vacuum advance disconnected
Maximum rpm:
5500
NOTE:
Distributor with melonized steel gear MUST be used with engines with steel camshafts, or engine damage will occur.
NOTE:
GMPP HEI distributor P/N 93440806 is recommended.
Piston Part Number:
12533507
Pistons Type:
Forged aluminum
Recommended fuel:
92 octane
Rocker arm ratio:
1.7:1
Rocker arms Part Number:
12523976
Rocker arms Type:
Stamped steel
Valve size (in):
2.19 intake / 1.88 exhaust
Water Pump Part Number:
12484890
Water pump Type:
Cast iron, long-style
George Carter
Central Florida
gcarter763@aol.com
http://kineticocentralfl.com/
“If you have to argue your science by using fraud, your science is not valid"
Professor Ian Plimer, Adilaide and Melbourne Universities
I thought I read that Mercury bought the tooling. I remember getting the last two LS-7 crate engines from Scoggin Dickey for $2700. apiece back in '88 or '89.
http://www.seabuddyonboats.com/boats...-hp-to-700-hp/
Wear 100% cotton or nothing at all
'86 22-Classic 2+3
'85 Criterion SS
'84 Hornet III
"I thought I read that Mercury bought the tooling. I remember getting the last two LS-7 crate engines from Scoggin Dickey for $2700. apiece back in '88 or '89.
http://www.seabuddyonboats.com/boats...-hp-to-700-hp/ "
Interesting article but I don't think Mercury is building these engines. Maybe some misinformation? I think GM is still building them as crate engines.
Lake St. Clair, Lake Huron, Lake Erie, Lake Oakland
The GM Tonawanda NY engine plant was the very last GM owned facilty building any big block iron Chevy engines.
There was a big deal made in Tonawanda NY when the very last Big Block engine came off the line.
It was also on the national TV news.
As I had mentioned earlier this GM plant, & the Big Block line, had been in continous production since 1965 .
GM & Mercruiser stockpiled most of these last batch of engines & parts off of this line.
It is now possible that someone bought the machine tooling, casting patterns, etc and restarted production at another site ?
~~~I know Mercruiser was very interested in doing this ?
GM & Mercruiser have had a very long working relationship history.
Mercruiser actually built ALL the very first limited production Corvette ZR-1 series engines .
The long awaited ZR-! was delayed at least a year and a half because Mercruiser had problems building these engines for GM/Chevy.
These first very limited production ZR-1 Aluminum High performance Vette engines had some real serious issues.
A friend of mine bought two ZR-1 Vettes new in this time period.
He actually drove one car~~~ while putting the other in long-term storage to speculate on it as a car collector.
Last edited by silverghost; 01-20-2012 at 08:20 AM.
"BENCHSEAT 18" ~~YellowJacket~~ project owner~
1929 Chris~Craft 28' Tripple Cockpit Mahogany Speedboat / A-120-A 845 Cu.In. 375 H.P. Chris~Craft V-8 racing engine.
24' American Skier
Super Eagle 454 HO Skiboat
1991 454 SS Chevy Super Sport Pick-up for towing my "Toys".
There is no such thing as going too fast ~ ~~
OR~ Being too old~ for a new "Toy"!
Brad Hunter
Huntingdon Valley Pa (Just outside Philly)~
Ocean City NJ
silverghost1926@msn.com
215 947 4676 (PA Home)
They built the 'vette engines because of their expertise and facilities for casting aluminum blocks. Remember they've been building aluminum outboards for many years. Now to built a cast iron engine is a whole different thing and ttbomk Mercury does not have a foundry or facility to do this. Maybe the GM big blocks that went out of production were the ones used in GM vehicles? The 502 was never offered in a vehicle afaik.
Lake St. Clair, Lake Huron, Lake Erie, Lake Oakland
So where did things end up?
1972 16 OB - C16B-63 - "Surface Tension" Resto Project
1974 16 OB - DMR16106017-B - "The Mule"
The 496 is history and Mercury is back to buying 502 crate engines from GM for their production engines with catalytic converters. I believe the "blue" engines still use raw blocks CNC machined in house by Mercury. http://www.chevrolet.com/performance...ck-502-ho.html
Lake St. Clair, Lake Huron, Lake Erie, Lake Oakland
FWIW, and there're folks here that know a LOT more about this than I do, Dart blocks are a world apart from GM blocks. I'm not a metallurgist either, but the iron in the Dart block I bought is the densest, most uniform cast iron I've ever seen. The gentleman that did the block prep told me there's very little prep work to a Dart block compared to a GM block. The outside of the block was pretty slick w/no snags at the parting lines.
I suppose Dart isn't planning on going out of business any time soon, so I don't see a problem.
George Carter
Central Florida
gcarter763@aol.com
http://kineticocentralfl.com/
“If you have to argue your science by using fraud, your science is not valid"
Professor Ian Plimer, Adilaide and Melbourne Universities
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