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difference in 6.2 and 6.5??

Discussion in '1982-Present GM Diesel' started by 82K5_6.5L, Jan 31, 2003.

  1. 82K5_6.5L

    82K5_6.5L 1/2 ton status

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    hey what is the big difference between the 6.5L and the 6.2L? cuz i have the 6.5L, but the blazer came with a 6.2L...just curious.
    thanx /forums/images/graemlins/tongue.gif
     
  2. u2slow

    u2slow 1/2 ton status

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    Turbo charger, and computer control mainly.
     
  3. arveetek

    arveetek 1/2 ton status

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    The 6.5L has a larger bore. The crankshafts are the same. The heads between the 6.2L and 6.5L are inter-changeable, although with some small differences.

    You can think of the 6.5L as a bored out 6.2L, but it's really a bit more than that. You can't bore out a '82-91 6.2L to 6.5L dimensions...the block doesn't have thick enough cylinder walls. However, during the transition year of 1992, that particular 6.2L could be bored out to a 6.5L. Lee Swanger over at www.thedieselpage.com did that to a 6.2L block. You can read about that project here.

    The 92-93 6.5L was turbocharged from the factory, except for some light duty n/a models, usually found in vans. They also utilized mechanical fuel injection pumps like our 6.2L's. In 1994, GM switched to an all electronic, computer-controlled injection pump.

    After the 6.2L was phased out in 1992, people needing a new replacement diesel engine used a 6.5L, which is a direct bolt-in, and looks identical on the outside. They share all the same bolt patterns, so anything bolted to a 6.2L will bolt to a 6.5L, and vice versa.

    Oh yeah, the turbo versions of the 6.5L came from the factory with re-designed heads for more power, and also had a special coating on the pistons to help reduce heat.

    The 6.5L has a solid power advantage over the 6.2L in at least one respect: more cubic inches.

    Just in case anyone else is interested, GM offered a turbocharged 6.2L in 1992, using a Banks system. I have never actually seen a factory Banks turbo'ed 6.2L, but they are out there.

    Casey
     

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