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Old 08-06-2020, 05:08 PM   #369
MDPotter
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Join Date: Aug 2018
Location: Western Colorado
Posts: 1,165
Re: 1968 GMC - Ol' Blue

I was out on a tuning drive a couple weeks ago and stopped to take some pictures as a storm was rolling in. A few updates:

-I replaced the generic MAP sensor with AC Delco and it seemed to help but hasn't eliminated the problem. It still runs a little rough under light acceleration once warmed up, but only once in a while. Not done tuning yet though. Still have to get into timing, but it runs pretty good - 0-60 in 5.4. It's really slow off the line, but it really pulls once you get into the powerband. I have a 12-bolt with 4.11 gears to swap someday which will help with acceleration. My 3.54 rear end is a little high since I don't get on the interstate with it.

-I have a sway bar and new front coil springs to install one of these days. I regret chopping another 1/2 coil off my springs so I bought new 1" drop to get me back where it was.

-Someday I'll get Vintage Air. Been spending money on wedding stuff.

-The reverberations that I feel/hear are still there at certain RPM's. I might try replacing the rubber engine mounts with nice poly mounts and see if it makes a difference.

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1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632
1968 GMC C15 - Gen III 6.0 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=772047
1969 Chevy C10 - Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=809184
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1993 Chevy C1500 - 5.3/T56 swapped
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