What is a 502?
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What is a 502?

  1. #1
    AAARRRRRGGGGGGG!!!!! Motomatt68's Avatar
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    Default What is a 502?

    I drove up to Oregon this weekend to pickup a new (new to me) boat. It is an aluminum boat built for rivers and whitewater. The guy I bought it from knew very little about boats. He told me he had no idea what kind of engine it had but his brother thought it was a 454. I had him send me a picture and it looked like a 454 in the picture. When I went to pick it up I noticed the paperwork said that is was a Chevy 502. I know small blocks more than anything but I have never worked on a BBC. Is there a difference that is visible from the outside? Is this something that is done to a 454 (bored and stroked) like a 383 is from a 350? Should I be scared?

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    Because of this purchase I have put my other project on hold. Really my wife got sick of me constantly working on the boat and not doing anything fun so she told me to buy a good one that works! (she is the best wife ever)

    Matt.

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  3. #2
    Renegade jet tunneljet's Avatar
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    A 502 is a great motor. It uses the same 4.0 stroke as the 454 but it has a bigger bore. Most parts should interchange with a 454.

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    Senior Member DuaneHTP's Avatar
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    Instead of having 7.4 on the block, it will have 8.2 on the block/

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  6. #4
    AAARRRRRGGGGGGG!!!!! Motomatt68's Avatar
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    Where do I look on the block for the 8.2?

    So a 502 is an actual production motor? Not a "hybrid" like a 383?

    Matt.
    Last edited by Motomatt68; 05-31-2010 at 08:23 AM.

  7. #5
    Senior Member Fonz69's Avatar
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    You got it

    http://www.gmhorsepower.com/ZZ502-Deluxe-Assembled.php

    When built right they will make some serious power

  8. #6
    Member hollbrow's Avatar
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    Yes- the 502 is a GM manufactured High Performance crate engine. It has the good stuff in it.

  9. #7
    Senior Member wolfie's Avatar
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    Wow...I thought a 502 was a section in the California penal code about drunk driving. You learn something new every day.

  10. #8
    Cas
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    Angry American Cas's Avatar
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    Chevy has 4 502's with different HP ratings.
    http://www.gmperformanceparts.com/Pa...l.jsp?engine=4

    not sure how you can check to see which one you have although it's probably not the RamJet
    Last edited by Cas; 05-31-2010 at 09:38 AM.

  11. #9
    I'm No Expert Shaun's Avatar
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    So the parts from a 454 are interchangable with a 502? So i can take my 4.25" crank + rods and make a 533CID?

  12. #10
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    I think you would need an adapter so your 2 piece rear seal would work.

    Tim

  13. #11
    Senior Member TwinTurbo540's Avatar
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    Quote Originally Posted by Shaun View Post
    So the parts from a 454 are interchangable with a 502? So i can take my 4.25" crank + rods and make a 533CID?
    Lots of guys look for the 502 blocks to do a 540. I had a 502 in my first jet boat, a sleekcraft sst tunnel and I ran it hard all day long with zero issues.

    Travis
    I like my women like I like my boats......Fast and ready to get wet at all times!!

  14. #12
    classic hot boater Orange Peel's Avatar
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    Default 502

    I had a 502ci/502hp crate engine it was a great engine, I changed a few things and added a 420 blower she did 747hp 803tq on the dyno..
    I think you will be happy with it..

    Does it have alum heads?
    Never forget where you come from,no matter where you are going.

  15. #13
    Senior Member DuaneHTP's Avatar
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    We just put in a HTP stage III roller cam and did some head work to my grandson's 502 and it made 651 hp on the dynp at 6300 rpm on 91 octane with a Gary Williams 950 cfm carb. Strong motors. Duane HTP

  16. #14
    Screamin SeaMonkees Schi-502's Avatar
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    ZZ502 in my Schiada jet daycruiser. I've had it since '03. No problems, no issues. I love the torque. SS "A" imp in a 12jg.
    Loose, the Dogs of War!

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