Results 1 to 3 of 3

Thread: 6.2 to 6.5

  1. #1
    Join Date
    Sep 2020
    Location
    Quincy Mass, USA
    Posts
    1

    Default 6.2 to 6.5

    I have a 98 GMC Grumman stepvan, last week the motor blew. I was lucky to find a Chevy cube truck (government surplus) very clean and low miles, Because the truck carcass was going to the junkyard we were able to pull the motor and trans fully intact. At this point I sent the truck to the mechanic to complete the swap. This morning the mechanic called me and told me, as he began to dig in, he soon realized the existing blown motor was actually a 6.2 diesel. My question: is it worth it to convert the 6.5 and use it, or am I better off finding a 6.2 which I really don't want to do. Keep in mind The 6.5 has less than 15,000 miles on it, also I am hemorrhaging money every day the truck is idle. I look forward to your suggestions. SD

  2. #2
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

    Default

    Welcome aboard!

    The 6.2 and 6.5 long blocks are interchangeable, especially so within chassis applications, such as yours. The actual displacement isn't relevant. If both have a serpentine belt, it should be seamless (a V-belt would indicate a much earlier model complete swap). If the belts are different, have your mechanic look at the intake manifold bolts (easiest method to determine the application). If the bolts are right angle into the heads, it's a "truck" engine. If they are vertical, it is a "van" engine, which is what yours was originally, with the only notable difference being the heads. There are some differences between the fuel systems over the years (injection pump, lines, and injectors), but you can use the one that fits if they are different. You can either do a complete swap (intake to pan), including fuel system, or just swap the long blocks.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  3. #3
    Join Date
    Dec 2003
    Location
    Yukon Canada
    Posts
    1,612

    Default

    If yours was a 98 with a 6.2 then somebody has already done the switch from 6.5 to 6.2
    So going back to stock in your case should be easy.
    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

Similar Threads

  1. 6.5 heads on 6.2 block tech help please
    By msomers in forum Diesel Conversions
    Replies: 3
    Last Post: 11-30-2010, 11:32
  2. Lots of 6.2 6.5 and 6.5TD parts for sale
    By Bobbie Martin in forum TDP Classified ad forum
    Replies: 0
    Last Post: 09-09-2010, 09:35
  3. 6.2 and 6.5 Diesels that we've had
    By Truck451 in forum Photo Forum
    Replies: 2
    Last Post: 08-13-2010, 19:49
  4. 6.5 turbo on 6.2 pump questions....
    By vr1967 in forum 6.2L Diesel - Tech Support - Troubleshooting - Performance
    Replies: 1
    Last Post: 07-22-2008, 11:46
  5. 6.2 or 6.5 injector ?
    By coxfmly in forum 6.2L Diesel - Tech Support - Troubleshooting - Performance
    Replies: 2
    Last Post: 11-21-2005, 05:01

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •