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Thread: 350 crate motor
          
   
   

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  1. #1
    guilld is offline CHR Member/Contributor Visit my Photo Gallery
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    350 crate motor

     



    We purchased a 350 crate motor about two or three years ago. It is the engine gm sells for carb engine replacements.

    Would this engine have roller tappet cam or flat tappet?
    Danny

  2. #2
    Dq383500's Avatar
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    Im not sure. it would depend on which one you bought

  3. #3
    glennsexton's Avatar
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    Numbers would be nice - here's but a few of the GM engines available for sale over the past few years.

    350/290 HP TECH SPECS: Part Number: 12499529
    Engine type: Chevy small-block V-8
    Displacement (cu in): 350
    Bore x stroke (in): 4.00 x 3.48
    Block (P/N 10066034): Cast iron with 4-bolt main caps
    Crankshaft (P/N 93426651): Nodular iron
    Connecting rods (P/N 10108688): Powdered metal steel
    Pistons (P/N 12514101): Cast aluminum
    Camshaft type (P/N 3896962): Hydraulic flat tappet
    Camshaft lift (in): .450 intake / .460 exhaust
    Camshaft duration (@.050 in): 222° intake / 222° exhaust
    Cylinder heads (P/N 93438648): Iron; 76 cc chambers
    Valve size (in): 1.94 intake / 1.50 exhaust
    Compression ratio: 8.5:1
    Rocker arms (P/N 10089648): Stamped steel Rocker arm ratio: 1.5:1
    Recommended fuel: 87 octane
    Ignition timing: 34° total BTDC
    Maximum rpm: 5100

    350 HO TECH SPECS: Part Number: 12499711
    Engine type: Chevy small-block V-8
    Displacement (cu in): 350
    Bore x stroke (in): 4.00 x 3.48
    Block (P/N 10105123)): Cast iron with 4-bolt main caps
    Crankshaft (P/N 14088526): Nodular iron
    Connecting rods (P/N 10108688): Powdered metal steel
    Pistons (P/N 12514101): Cast aluminum
    Camshaft type (P/N 24502476): Hydraulic flat tappet
    Camshaft lift (in): .435 intake / .460 exhaust
    Camshaft duration (@.050 in): 212'c1 intake / 222'c1 exhaust
    Cylinder heads (P/N 12558060): Vortec iron; 64 cc chambers
    Valve size (in): 1.94 intake / 1.50 exhaust
    Compression ratio: 9.1:1
    Rocker arms (P/N 10089648): Stamped steel Rocker arm ratio: 1.5:1
    Water pump (P/N 88894341): Cast iron, long-style
    Flexplate (P/N 14088765): 14"
    Recommended fuel: 92 octane Ignition timing: 10'c1 BTDC @ 700 rpm
    Maximum rpm: 5500

    ZZ4 350 BASE TECH SPECS: Part Number: 24502609
    Engine type: Chevy small-block V-8
    Displacement (cu in): 350
    Bore x stroke (in)cf6 : 4.00 x 3.48
    Block (P/N 10105123): Cast iron with 4-bolt main caps Crankshaft (P/N 12556307): Forged steel
    Connecting rods (P/N 10108688): Powdered metal steel
    Pistons (P/N 10159436): High-silicon aluminum with offset pins
    Camshaft type (P/N 10185071): Steel hydraulic roller
    Camshaft lift (in): .474 intake / .510 exhaust
    Camshaft duration (@.050 in): 208'c1 intake / 221'c1 exhaust
    Cylinder heads (P/N 12556463): Aluminum; 58cc chambers
    Valve size (in): 1.94 intake / 1.50 exhaust
    Compression ratio: 10:1
    Rocker arms (P/N 10089648): Stamped steel Rocker arm ratio: 1.5:1
    Recommended fuel: 92 octane
    Maximum rpm: 5800

    ZZ4 350 Turn-Key TECH SPECS: Part Number: 12496968
    Engine type: Chevy small-block V-8
    Displacement (cu in): 350 Bore x stroke (in): 4.00 x 3.48
    Block (P/N 10105123)): Cast iron with 4-bolt main caps
    Crankshaft (P/N 14088526): Nodular iron
    Connecting rods (P/N 10108688): Powdered metal steel
    Pistons (P/N 12514101): Cast aluminum
    Camshaft type (P/N 24502476): Hydraulic flat tappet
    Camshaft lift (in): .435 intake / .460 exhaust
    Camshaft duration (@.050 in): 212'c1 intake / 222'c1 exhaust
    Cylinder heads (P/N 12558060): Vortec iron; 64 cc chambers
    Valve size (in): 1.94 intake / 1.50 exhaust
    Compression ratio: 9.1:1
    Rocker arms (P/N 10089648): Stamped steel
    Rocker arm ratio: 1.5:1
    Water pump (P/N 88894341): Cast iron, long-style
    Flexplate (P/N 14088765): 14"
    Recommended fuel: 92 octane
    Maximum rpm: 5500

    RAM JET 350 TECH SPECS: Part Number: 12499120
    Engine type: Chevy small-block V-8
    Displacement (cu in): 350 Bore x stroke (in): 4.00 x 3.48
    Block: Cast iron with 2-bolt main caps
    Crankshaft (P/N 10243068): Cast iron
    Connecting rods (P/N 10108688): Powdered metal steel
    Pistons (P/N 88894280): Hypereutectic aluminum
    Camshaft type: (P/N 14097395) Hydraulic roller
    Camshaft lift (in) : .431 intake / .451 exhaust
    Camshaft duration (@.050 in): 196'c1 intake / 206'c1 exhaust
    Cylinder heads (P/N 12558060): Vortec iron; 64cc chambers
    Valve size (in): 1.94 intake / 1.50 exhaust
    Compression ratio: 9.4:1
    Rocker arms (P/N 12367346): Aluminum roller style Rocker arm ratio: 1.6:1
    Recommended fuel: 92 octane
    Maximum rpm: 5500

    FAST BURN 385 TECH SPECS: Part Number: 12499710
    Engine type: Chevy small-block V-8
    Displacement (cu in): 350 Bore x stroke (in): 4.00 x 3.48
    Block (P/N 10105123): Cast iron with 4-bolt main caps
    Crankshaft (P/N 12556307): Forged steel
    Connecting rods (P/N 10108688): Powdered metal steel
    Pistons (P/N 10159436): Hypereutectic aluminum
    Camshaft type (P/N 10185071): Hydraulic roller
    Camshaft lift (in): .474 intake / .510 exhaust
    Camshaft duration (@.050 in): 208'c1 intake / 221'c1 exhaust
    Cylinder heads (P/N 12464298): Fast Burn aluminum; 62cc chambers
    Valve size (in): 2.00 intake / 1.55 exhaust
    Compression ratio: 9.6:1
    Rocker arms (P/N 10089648): stamped steel Rocker arm ratio: 1.5:1
    Recommended fuel: 92 octane
    Maximum rpm: 5800

    HT383 TECH SPECS: Part Number: 12499101
    Engine type: Chevy small-block V-8
    Displacement (cu in): 383 Bore x stroke (in): 4.00 x 3.80
    Block (P/N 88962516): Cast iron with 4-bolt main caps
    Crankshaft (P/N 12489436): Forged steel
    Connecting rods (P/N 12497624): Heavy-duty PM steel
    Pistons (P/N 12499103): Hypereutectic aluminum
    Camshaft type (P/N 14097395): Hydraulic roller
    Camshaft lift (in): .431 intake / .451 exhaust
    Camshaft duration (@.050 in): 196'c1 intake / 206'c1 exhaust
    Cylinder heads (P/N 12558060): Vortec iron; 64cc chambers
    Valve size (in): 1.94 intake / 1.50 exhaust Compression ratio: 9.1:1
    Rocker arms (P/N 10089648): Stamped steel
    Rocker arm ratio: 1.5:1
    Water pump (P/N 88894341): Cast iron
    Recommended fuel: 87 octane
    Maximum rpm: 5000

    ZZ383/425 TECH SPECS: Part Number: 12498772
    Engine type: Chevy small-block V-8
    Displacement (cu in): 383 Bore x stroke (in): 4.00 x 3.80
    Block (P/N 88962516): Cast iron with 4-bolt main caps
    Crankshaft (P/N 12489436): Forged steel
    Connecting rods (P/N 12497624): Heavy-duty PM steel
    Pistons (P/N 12499103): Hypereutectic aluminum
    Camshaft type (P/N 12370846): Hydraulic roller
    Camshaft lift (in): .509 intake / .528 exhaust
    Camshaft duration (@.050 in): 222'c1 intake / 230'c1 exhaust
    Cylinder heads (P/N 12464298): Fast Burn aluminum; 62cc chambers
    Valve size (in): 2.00 intake / 1.55 exhaust
    Compression ratio: 9.6:1
    Rocker arms (P/N 12367345): Aluminum roller style Rocker arm ratio: 1.5:1
    Recommended fuel: 92 octane
    Maximum rpm: 6000

    As you can see - some are flat tappet, some are roller. Get a number and we can probably help you out!

    Regards,
    Glenn
    "Where the people fear the government you have tyranny. Where the government fears the people you have liberty." John Basil Barnhil

  4. #4
    techinspector1's Avatar
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    Turn the crank around until both valves on #1 cylinder are closed and the piston is at TDC. Remove the rocker adjusting nuts, rocker arms and pushrods from #1. Shine a very strong light down one of the pushrod holes while you peer down the other pushrod hole. If it's a roller cam, you'll be able to see the sheet metal spider and dog bones.....looks like this....
    Attached Images

  5. #5
    glennsexton's Avatar
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    Well gee Tech, that's what I was gonna say...
    "Where the people fear the government you have tyranny. Where the government fears the people you have liberty." John Basil Barnhil

  6. #6
    techinspector1's Avatar
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    Sorry Glenn, should have allowed you more time....

  7. #7
    jerry clayton's Avatar
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    damn--I could put a engine together quicker than typing all those specs

  8. #8
    jerry clayton's Avatar
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    but the answer to the question would be a simple yes---it would have a roller OR flat lifter cam!!!!!

  9. #9
    glennsexton's Avatar
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    I find myself a man possessed sometimes - actually, I just love the research and have tons of files on this stuff! One never knows when it may come in handy. I converted most to electronic media, so it's fairly easy to find and copy!
    "Where the people fear the government you have tyranny. Where the government fears the people you have liberty." John Basil Barnhil

  10. #10
    mopar34's Avatar
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    Regardless if you cut and pasted or typed it all out, I thank you for the info. Might come in handy one day so I printed it and stuck it in my folder titled "If The Need Should Arise".
    Bob

    A good friend will come and bail you out of jail....but a true friend will be sitting next to you saying..."Damn....that was fun!

  11. #11
    glennsexton's Avatar
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    When my father passed away (1995) I went through everything in his garage. He had file after file of projects - some he had completed and some were in his "If The Need Should Arise" file. It was bitter sweet at first, but as I continued through his mounds of documentation and paper, it became a time of joy and allowed me to hang on to just a bit more of him. What I'll ever do with the rebuild instructions for a Clinton 3 horse engine is a mystery, but if my kids someday enjoy reading all the "stuff" that I've electronically filed over the years half as much as I did my fathers written files, then it's worth it!

    Regards All,
    Glenn
    "Where the people fear the government you have tyranny. Where the government fears the people you have liberty." John Basil Barnhil

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