Results 1 to 15 of 15

Thread: 502 vs. 502

  1. #1
    Join Date
    Aug 2005
    Posts
    7,983
    Rep Power
    28

    502 vs. 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

  2. #2
    Join Date
    Jan 2006
    Posts
    4,215
    Rep Power
    23
    Standard Gen VI block. same as the 525, etc.

  3. #3
    Join Date
    Aug 2005
    Posts
    7,983
    Rep Power
    28
    "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

  4. #4
    Join Date
    Nov 2003
    Posts
    12,683
    Rep Power
    34
    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

  5. #5
    Join Date
    Aug 2005
    Posts
    7,983
    Rep Power
    28
    "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

  6. #6
    Join Date
    Jul 2009
    Posts
    1,553
    Rep Power
    16
    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)

  7. #7
    Join Date
    Nov 2003
    Posts
    12,683
    Rep Power
    34
    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
    Valve size (in):
    2.25 intake / 1.88 exhaust; stainless steel



    And they're available from $7,200.00 w/aluminum heads..
    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

  8. #8
    Join Date
    Nov 2003
    Posts
    12,683
    Rep Power
    34
    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

  9. #9
    Join Date
    Feb 2002
    Posts
    1,045
    Rep Power
    24
    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

  10. #10
    Join Date
    Aug 2005
    Posts
    7,983
    Rep Power
    28
    "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

  11. #11
    Join Date
    Jul 2009
    Posts
    1,553
    Rep Power
    16
    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)

  12. #12
    Join Date
    Aug 2005
    Posts
    7,983
    Rep Power
    28
    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

  13. #13
    Join Date
    Sep 2005
    Posts
    5,802
    Rep Power
    0
    So where did things end up?
    1972 16 OB - C16B-63 - "Surface Tension" Resto Project
    1974 16 OB - DMR16106017-B - "The Mule"

  14. #14
    Join Date
    Aug 2005
    Posts
    7,983
    Rep Power
    28
    Quote Originally Posted by Greg Guimond View Post
    So where did things end up?
    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

  15. #15
    Join Date
    Nov 2003
    Posts
    12,683
    Rep Power
    34
    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

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •