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Old 01-11-2005, 06:20 PM
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6.2 diesel conversion

hi im converting an 88 3500 from an 6.2 diesel to a 350 gas motor and i need to know if the bellhousing bolts are the same and also if i need to change the torge converter the truck has the three speed in it

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Old 01-11-2005, 10:55 PM
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The bellhousing bolts are the same size for both the diesel and gas engines.

The belhousing bolt pattern is the same for both also.

The diesel torque converter has a lower stall speed which your 350 will not like very well, so plan on changing to a higher stall speed converter.

Stock diesel converters stall around 1300rpms.
Stock gas converters stall around 1500 and up.

And unless you already know, the motor mounts should already be in the correct location for this swap.
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Old 01-14-2005, 11:41 PM
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I believe a 454 would be a much easier swap, although the engine cost more, the hi torque 502 would be a great engine especially if you tow. I believe that the 6.5 is a gas conv. of a bb but I could be wrong.
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Old 01-15-2005, 12:01 AM
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It is a pretty simple swap. It should bolt right in. I did mine and used the same converter, I guess it was a little loose, because it worked all right. My first swap was to a 454, then to a worked over 502 with overdrive and 411 gears, all in a 3/4 ton lowered chassis. A small street blower will do wonders for power. I use mine to tow a 30 ft. enclosed trailer with living quarters and my 69 camaro and a large display. 12,800 lb. + a full size motorcycle part of the time.
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Old 01-15-2005, 10:45 AM
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did you swap a 6.2 or a 6.5 for the 454
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Old 01-15-2005, 10:58 AM
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6.2, after twisting three cranks into and splitting a cylinder or two.

Troy
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Old 01-15-2005, 03:58 PM
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The 6.5 was a factory direct updated replacement for the 6.2, from the same engine manufacturer if I remember correctly.

The new 6.6 is manufactured by someone else. Mitsubishi comes to mind but I cannot remember at the moment.

I was considering swapping a Cadillac 500 into my other Suburban that formerly held a 6.2, and was told by our other trans mod Crosley that the same torque converter could be used for the big block but should be swapped out for one with a higher stall speed for a small block, because of the big blocks ability to make more torque at lower engine speeds, just like the diesel engines.
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Old 01-15-2005, 04:15 PM
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thanks for the replies one last thing on the 454 swap did you change the motor mounts
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Old 01-15-2005, 10:34 PM
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It's been 10 years sense that swap. I can't remember for sure, but I don't think I changed the towers, I'm sure I used the 454 mounts.

Troy
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Old 01-16-2005, 12:26 PM
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The 6.2 and 6.5 are not converted gassers. They are GM engines, which sort of makes the Detroit Diesels. The early 5.7, was based on a beefed up Olds block. The new Duramax, is an Isuzu, but no one can tell me for certain, if it's all Zuzi, or just the heads/injection system, on a Detroit block.

Some of the late 5.7's were roller cam engines. Several have appeared around here, converted to gassers, with 403 top end parts. They run like a scalded dog, until they shudder like a dog poopin peach seeds, and grenade. Pretty fair race motors, though.

P.S. the 6.5 was not an R&R motor, for the 6.2. The 6.5 superceded the 6.2, which was never a factory turbo engine. The 6.5 was always factory turbo.

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Old 01-29-2005, 02:29 PM
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Arrow Duramax 6600 Isuzu/GM

Isuzu provided the basic engineering development for the engine hardware, while GM Powertrain was responsible for calibrating the engine control systems, and vehicle integration.

The engine is manufactured in Moraine, Ohio by DMAX, Ltd, which is a joint venture between Isuzu Motors and General Motors. They're currently producing about 800 engines per day x six days per week.

Jim
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