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Thread: 6.5L Cylinder mismatched casting

  1. #1
    Join Date
    Aug 2023
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    United States, Oregon
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    Default 6.5L Cylinder mismatched casting

    Hello,

    I apologize if this topic has already been covered. I performed a search for cylinder heads and combed through pages of post but couldn't find an answer to this question.

    1.) Can you put mismatched casting numbers on an engine?
    2.) Can you put mismatched injector angle heads on an engine?

  2. #2
    Join Date
    Dec 2003
    Location
    Yukon Canada
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    Hi
    You probably can but i would not mix stuff, the engine will not be as balanced as it should be.
    It would be a get home type of fix which may not make the home part
    90 Chev 3500 c/c 4x4,6.2na,400 auto,4:10 gears.DSG Timing gears,main girdle, isspro tach, pyro,boost,oil and trany temp.Dual Tstats, High volume peninsular pump,on shelf, Custom turbo and intercooler 85%complete. Change of plans for the dually, it's going to get a Cummins. Both trucks are Blue 90 4x4 crews

  3. #3
    Join Date
    Apr 2001
    Location
    Newberg Oregon
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    The heads came in several styles

    The C engine (1/2 ton) with more emission
    The J engine (3/4 and 1 ton stuff

    There are a bunch of different pre-cup designs.....DO NOT MIX AND MATCH THESE AT ALL.

    Run all matching pre-cups.

    Best to keep matching heads with matching cups.

    The injector angles came into play when the turbo came into the game....Make more room to clear the turbo and such

    Short injectors or long injectors.....Fine or coarse thread injectors (Coarse thread...Early 6.2)
    (1) 1995 Suburban 2500 4x4
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  4. #4
    Join Date
    Feb 2000
    Location
    Montana
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    Default

    In a pinch, you probably could use a mismatched set, but as others here suggest, it could result in a more unbalanced running engine. Personally, I'd not consider it unless the valve diameters and the pre-cups were the same (or had the same size openings).

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