Posted by jdemaris on March 08, 2014 at 06:10:12 from (70.194.8.71):
In Reply to: 6.5 or 7.3 posted by blue924.9 on March 07, 2014 at 17:27:35:
The 7.3 IDI is a much heavier built engine then any GM made 6.5. The newest 6.5s made for the military have been beefed up quite a bit but that doesn't count.
7.3 has a forged-steel crank, all gear-drive in front, heavy cylinder heads with hardened valve- seat inserts, heavy block, etc.
6.5 has a cast-iron crank, chain drive in front, light cylinder heads that WILL crack when the ports get hot, a light block that will crack at the main-bearing webs after X amount of miles, etc. There is no way to fix the main-web cracking problem. GM tried with later 6.5s by making the outside main-cap-bolts smaller thus leaving more block metal. It helped but did not fix the problem. I would not trust any 6.2 or 6.5 for long-distance travel unless the oil-pan got pulled and the main webs got checked for cracks. Once they show - it's ticking time-bomb. Often around the 200K mile mark.
I still have my 1994 IDI turbo 7.3. 350,000 miles on it and the engine has never been apart. 4WD, extended cab, long-bed, 4.10 axles, E40D trans. Gets 17-18 MPG empty on highway in the flatlands of Michigan. Gets 16 MPG in hilly New York.
I've also got many 6.2s and 6.5s. Running and blown-up with broken cranks and blocks. I like them because they've always been easy to buy cheap.
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