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Thread: Head question on 6.5 with 6.2 block swap

  1. #1

    Default Head question on 6.5 with 6.2 block swap

    Hey guys, Im new to all this stuff but I have a 1997 K3500 with a 6.5 that started eating antifreeze so we pulled it apart and saw the cracks in the block, but the 6.5 heads were good. A solution that presented itself was to use a 1984 6.2 block and just install the 6.5 heads and Turbo etc.. I ended up having a mechanic do the work and he kept the 6.2 head on the drivers side, but changed out the 6.5 head on the passenger side to clear the turbo. This goes against my common knowledge of changing heads but is it a real problem? BTW its now throwing P0266 and P0272 codes.

    Any help would be appreciated.

    Thanks

  2. #2
    Join Date
    Mar 2000
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    Others can weigh in on the technical issues, but I’d not want to run an “uneven” configuration like that.
    '94 GMC 6.5TD K1500 4L80E 2-Door Yukon SLE 221K
    '93 Chevrolet 6.5TD K2500HD NV4500 Std. Cab Longbed 187K
    '85 Toyota 22R RN60 4x4 Std. Cab Shortbed 178K (Currently retired for rebuild)
    Diesel Page Member #2423

  3. #3
    Join Date
    Apr 2001
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    CA
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    Arrow

    The heads are of different design, in more ways than one (the 6.5 head used for turbo installation, for example). Many other issues will crop up, such as cylinder imbalance (the DTC's you are seeing), as well as other long term concerns. Which set of injector lines were used? You can't (successfully) mix/match nearly any of it, including the heads as a whole. Poor choice by the mechanic.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  4. #4
    AKMark is offline Building another 6.2L powered vehicle
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    Dec 2006
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    Use matching heads, this is important!
    05 2500HD CC LB LLY, 4x4, 3.73s 235/85R16's, webasto cab heater, to keep it warm.
    03 Buick Rendezvous - When you average over 80 miles per day driving around, you need one of these.
    85 K-5, 6.2, SM465, Rockwell T221, 1 tons, 36's. More goodies to be installed as time and money allows.
    82 K20, 6.2, SM465, NP208, stock except for bed rack, snow plow, and glow plugs are on a toggle switch. It works great for plowing!
    72 Postal Jeep - Yet another project

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