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Question About the 502 Retro-Kit Truck GM Performance Parts Crate Engine

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 1-ton, Oct 3, 2004.

  1. 1-ton

    1-ton 1/2 ton status Premium Member

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    [ QUOTE ]
    This new emission-legal 502 cubic-inch (50 state) Retro-Kit engine conversion kit from GM Performance Parts is designed for 1991-93 Chevrolet and GMC 10, 20 and 30-series trucks with 2-wheel drive, originally equipped with a 454 TBI engine and 4L80E automatic overdrive transmission. (Will not work on 4 wheel drive because of exhaust interference)

    [/ QUOTE ]

    My question is about the last part "Will not work with 4-wheel drive because of exhaust interference".

    does this remain true with aftermarket shorty headers?
     
  2. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    If you already have a BBC in your truck and just want the bigger cubes it will fit. If the engine comes with manifolds already installed then maybe they won't fit a 4WD chassis but then you just use your existing manifolds or headers.
     
  3. 1-ton

    1-ton 1/2 ton status Premium Member

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    Actually my truck came with a 350, but a 454 was an option for it. If I where to put this 502 into it, I was going buy aftermarket headers for it and a whole new exhaust system for it anyway; along with many other changes. The exhaust system for a 502 has to workout some way on a 4-wheel drive or else it would kill 80% of the market out there that would purchase the Big Block 502.

    I wonder if they mean the IFS 4-wheel drive trucks, and not straight-axle trucks like mine?
     
  4. 84gmcjimmy

    84gmcjimmy 1 ton status

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    Maybe it means you need to snip your frame a bit so the headers/exhuast will fit? /forums/images/graemlins/dunno.gif
     
  5. jwduke

    jwduke 1/2 ton status

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    Re: Question About the 502 Retro-Kit Truck GM Performance Parts Crate Engin

    Isn't a R20 & R30 2 different vehicles (frames) completely the R20 being IFS, and the R30 being Solid axle? I can see having clearance problems with a R20, because of IFS.
     
  6. 1-ton

    1-ton 1/2 ton status Premium Member

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    Re: Question About the 502 Retro-Kit Truck GM Performance Parts Crate Engin

    [ QUOTE ]
    Isn't a R20 & R30 2 different vehicles (frames) completely the R20 being IFS, and the R30 being Solid axle? I can see having clearance problems with a R20, because of IFS.

    [/ QUOTE ]

    I think it something goes like this, but not positive.

    C 15, 25, 35 are two-wheel drive Generation 3 body style

    K 15, 25, 35 are an IFS four-wheel drive Generation 3 body style

    V 25, 35 is a straight axle four-wheel drive with the old generation 2 body style (no V15 exists I think, but not positive)

    R 25, 35 is two-wheel drive with the old generation 2 body style (no R 15 exists I think, but not positive)


    The 502 replacement engine is for the generation 3 body style two-wheel drive C 20, 30 GM trucks. They say it will not fit the four wheel-drives because of exhaust clearance issues, but I wonder if that is with the IFS four-wheel suspension; and not the solid axle because the IFS trucks have a huge cross member, which could cause interference that the solid axle does not have. I would think that if a truck can clear a 454 exhaust system, then it should be able to clear a 502. I think the 502 is the same block and heads as a 454, but just stroked like a 350 is to a 383.
     
  7. afroman006

    afroman006 1/2 ton status

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    Re: Question About the 502 Retro-Kit Truck GM Performance Parts Crate Engin

    Tecnically, the 502 is to BBC's as the 400 is to SBC's. Same size block with siamesed cylinders, bigger bores, and longer strokes.
     
  8. jwduke

    jwduke 1/2 ton status

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    Re: Question About the 502 Retro-Kit Truck GM Performance Parts Crate Engin

    [ QUOTE ]
    [ QUOTE ]
    Isn't a R20 & R30 2 different vehicles (frames) completely the R20 being IFS, and the R30 being Solid axle? I can see having clearance problems with a R20, because of IFS.

    [/ QUOTE ]

    I think it something goes like this, but not positive.

    C 15, 25, 35 are two-wheel drive Generation 3 body style

    K 15, 25, 35 are an IFS four-wheel drive Generation 3 body style

    V 25, 35 is a straight axle four-wheel drive with the old generation 2 body style (no V15 exists I think, but not positive)

    R 25, 35 is two-wheel drive with the old generation 2 body style (no R 15 exists I think, but not positive)


    The 502 replacement engine is for the generation 3 body style two-wheel drive C 20, 30 GM trucks. They say it will not fit the four wheel-drives because of exhaust clearance issues, but I wonder if that is with the IFS four-wheel suspension; and not the solid axle because the IFS trucks have a huge cross member, which could cause interference that the solid axle does not have. I would think that if a truck can clear a 454 exhaust system, then it should be able to clear a 502. I think the 502 is the same block and heads as a 454, but just stroked like a 350 is to a 383.

    [/ QUOTE ]

    Yeah, thats what I was trying to say, thanks!!! I agree with you 100%.
     
  9. 1-ton

    1-ton 1/2 ton status Premium Member

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    Re: Question About the 502 Retro-Kit Truck GM Performance Parts Crate Engin

    [ QUOTE ]
    Tecnically, the 502 is to BBC's as the 400 is to SBC's. Same size block with siamesed cylinders, bigger bores, and longer strokes.

    [/ QUOTE ]

    I was not sure exactly how they got the 502 cubic inches, but I thought I remembered back when the 502 first came out an article said it was based on the "Mark IV" Big Block casting.
     

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