73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Blazin on August 10, 2010, 08:38:10 pm
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Head gasket gave it up in the 86 this morning! Didn't quite make 227,000 miles!
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Aww! Thats too bad! Im sure it had a good run though. lol ;D
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Was a faithfull motor both times I have run the truck. It sat for about four years while I swapped the cab etc.
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Always a good reason for upgrades ;D
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Might still be under warranty.
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Are you going to grab a spare 350 from 1 of your parts trucks?
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I have a low milage TBI 350 in one of them. Going to slide an RV cam, double roller chain, and a high volume pump into it. Need to get an intake to run a carb too.
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Are you going to leave the tbi heads on there?
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Does your TBI motor have the fuel pump boss on it?
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Yes I am leaving them, and it has a place for a fuel pump.
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I had a head gasket give out recently myself and after a replacement and a failed head I decided to pull the motor and build a 383.
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After the head gasket gave it up I was still limping it along as I only live about 4 miles from work. Figuring I would get the motor done sometime before snow. Well the clutch blew lunch and its been sitting for about a month now. Been gathering parts. I had a guy that owed me money rebuild this motor about 15 years ago. After about 700 or 800 miles the harmonic balancer fell off and munched the end of the crank where the key way goes. Its been sitting under the hood of that truck ever since. Got run about once a year. I put a new key way in, and filled the missing metal on the crank with weld. Put new rear, and front main seals. New intake, valve cover, and one piece oil pan gasket. Then I primed the bare metal with Transtars self etching primer. I painted all the rust with Chassis Saver. Then I gave it a nice fresh coat of paint. Going to try and drop it in next weekend.
(http://i136.photobucket.com/albums/q165/BlazinK30/86%20GMC%20rebuild/102_0476.jpg)
(http://i136.photobucket.com/albums/q165/BlazinK30/86%20GMC%20rebuild/102_0478.jpg)
(http://i136.photobucket.com/albums/q165/BlazinK30/86%20GMC%20rebuild/102_0481.jpg)
Catapilar yellow baby!
(http://i136.photobucket.com/albums/q165/BlazinK30/86%20GMC%20rebuild/102_0482.jpg)
(http://i136.photobucket.com/albums/q165/BlazinK30/86%20GMC%20rebuild/102_0483.jpg)
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As much as I am not a fan of yellow, Cat yellow makes my inner redneck heart go pitter-patter. Very nice!
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Didn't you know Cat Yellow adds torque? Looks like it does anyway. I like it.
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Ain't no 550 C15 but it will work!
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Well I kinda never got back to put more pics on here.
The old motor:
(http://i136.photobucket.com/albums/q165/BlazinK30/86%20GMC%20rebuild/IMG_4558.jpg)
The new motor bolted in:
(http://i136.photobucket.com/albums/q165/BlazinK30/86%20GMC%20rebuild/IMG_4561.jpg)
Pretty much buttoned up except the hood, and radiator:
(http://i136.photobucket.com/albums/q165/BlazinK30/86%20GMC%20rebuild/102_0488.jpg)
Been running pretty good all winter, have a rattling / tapping noise but I can't seem to figure out what it is. Only hear it when on the gas!
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Exhaust leak?
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Sounds like it's pinging!
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Ohhh hood point vile. Does it sound like a bunch of beans rattling around in a tin can? Check your timing!
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No exhaust leak, thats what I thought it was at first. Set the carb and timing at the same time with a timing light, and a vac gage. Only way I can get it to ping is if I lug it way down in top gear into a hill. checked the flywheel thing it was hitting, have looked and looked. Best myself and several of my friends can think of is one cylinder has a little piston slop. Its not bored, just honed, and new rings on the old pistons. I bought the motor in pieces, and a rebuild kit came with it, It was built about 15 years ago, never out 1,000 miles on it back then. I don't remember the noise back then though! Truck didn't make the noise with the old motor. Oil pressure is great, it runs good. I guess I will know when what ever it is breaks!!! ::)
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It might sound a little crazy... Might be a bad exhaust valve guide, I have only seen it happen a couple of times.. But it has to be pretty wore out for exhaust to blow up the valve stem into the valve cover.
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Hmm, doesn't hurt to take a peak I guess. Never heard of that before. The heads were used that I put on it way back then. 1.94 305 mid 70s heads.