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Tractor Talk Discussion Forum

6.5TD GM cylinder heads

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JCSinGA

04-10-2007 03:59:32




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I'm building myself another service truck it's a '95 GMC 3500HD with the infamous 6.5 diesel.

Nothing on the original engine was worth reusing block, crank, heads, camshaft were all ruined.

I got another engine from a 93-94 Chevy van course it's non-turbo but luckily the turbo was good on the original engine.

I like the mechanical injection pump better anyway should be more reliable than the electronic models.

The purpose of my post is to inquire if anyone knows what the difference in the heads are on the early models 93-94 versus 95-up I am looking for a set of heads still, I found a pair off a 96 but the guy tells me they dont fit a 93-94 application. Thanks for any help

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jdemaris

04-10-2007 11:56:06




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 Re: 6.5TD GM cylinder heads in reply to JCSinGA, 04-10-2007 03:59:32  
It's not a matter of early versus late, it's a matter of version and horsepower output. You can take just about any head from any 6.5 and swap it to another 6.5 or an older 6.2 - and vice-versa. From the factory - turbo 6.5s had one version of an assembled head for the Vin-code F engines, and another to fit the Vin-code P and S engines.
The precombustion-chambers differ depending on horsepower levels. The bigger the pre-cup, the more power potential when used with more fuel and boost - and also slightly less efficiency without it. Also, some newer heads got beefed up. As far as I know - the best heads on the market right now - and the cheapest - are made in China - and weigh around 4 lbs. more each then the original heads GM used. You can buy new bare castings for around $185 each - or complete assembled heads for around $300 each. The new Chinese heads come with hardened intake and exhaust valve seat-inserts too. You can also put these new 6.5 turbo heads onto any 6.2 back to the first-year engines made in 1982. The 6.2/6.5 engine series got changed to short injectors early 90s and the later heads have the injectors mounted at a slightly different angle - but it's no big deal. Last set of new 6.5 heads I put onto an 83 6.2 - I had to bend the injector lines a little bit, to match the new angle. I suspect if you went to GM and ordered new heads - or International-Remy - they would be selling you Chinese heads - reboxed.

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JCSinGA

04-11-2007 09:53:42




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 Re: 6.5TD GM cylinder heads in reply to jdemaris, 04-10-2007 11:56:06  
Thanks for the info, I didn't know there were different HP configurations. I'm looking at some heads on Ebay that I'm sure are what you are talking about, they are new castings with no valves or springs. Guess I'll go that way. Thanks again



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