Re: 350gas- to- 6.2 diesel

Posted by jdemaris on December 26, 2006 at 17:58:11 from (66.218.15.57):

In Reply to: 350gas- to- 6.2 diesel posted by Dave Sherburne NY on December 26, 2006 at 14:34:33:

Sounds like maybe you got the 6.2 out of the school-bus G30 van I was looking at awhile ago? Supposed to have 80K miles?
Any axle-ratio up to a 3.73 will work okay - just gets a little noisy at 65 MPH. If you've got 4.10 ratio - it's a stretch at 65 MPH - I've got two like that. A 3/4 truck with stock tires will turn 2750 RPM at 65 MPH, a 1/2 ton will turn 3000 RPM. I put 520,000 miles on my 6.2 Suburban with 3.73s, no overdrive, and lots of 65-70 MPH driving. Keep in mind though, that a 6.2 is at it's peak of efficiency at 1800 RPM - and pretty much stops gaining power past 2200 RPM.
In regard to the change-over - as others told you - the engine-bolt-pattern is the same. There are plenty of 6.2 manual flywheels around - CASTING # 14050525 PART # 16668. If you have a vacuum booster for brakes - you've need to either change over to hydroboost - or add some sort of vacuum pump. Many 6.2s aleady have a small rear-mounted vacuum pump - but some applications use a belt-driven - like vans and some newer trucks.
You'll probably also need the vacuum to run cruise-control and heater/defroster controls.
You absolutely need a good 6.2 radiator, and also a good diesel fuel-filter and water-separator. The stock filter assembly GM uses from 1985 on has a built in fuel heater, water separator, etc.
Also -glow-plug controller system needs to be right - or - install a manual push-button along with current-limiting glow-plugs - e.g. AC 60Gs (made by Beru), Wellman WAPs, etc. They won't blow if you hold them on too long.
Your best bet might be a cheap rusted-out donor vehicle with all the little parts. I know where there are several - I've got over 30 6.2 diesel trucks/Suburbans/Blazers. They can often be found in central New York in the $50-$400 price ranges.
I bought a good running 86 Blazer 4WD with 6.2 diesel and 80K miles this morning for $200. I bought another last week with a bad trans. for $50.

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