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Vortec 383???



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Old 06-15-2009, 03:25 PM   #1
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Vortec 383???

Two part question. I have a 99 tahoe with a vortec 5.7 with 113K miles. There is a ticking noise coming from the valve train. Sounds like a lifter sticking or something. Does not doing it all the time; usually just at start up till it gets good and warm. Any ideas on what that is or how to fix it? I know that is vage, but it is all I have to go on right now. May just have to pull the heads and have them redone.


But that got me wondering. Is there any reason I could not find a 383 stroker short block out of an older carbed. vehicle and bolt the vortec stuff on it, or are the blocks diffrent? Anyone done this? Would you have to do a custom tune on the computer for it to work right? Impact on fuel mileage?

Just kickin some ideas around in my head.
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Old 06-16-2009, 04:55 PM   #2
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I'm no expert but I am willing to bet you won't be able to do it.

GMPP builds Vortec 383's that might work with your computer

I believe the Vortec motors had roller cams from the factory, an older 383 stroker from a carb'd motor would have a flat tappet cam

I'll let someone more knowledgable chime in
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Old 06-16-2009, 09:00 PM   #3
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Look into the GMPP HT383E. It is supposedly a direct drop in for the vortec 350. No programming or modifications required, although to get the most out of it you would probably want a retune anyway. It shouldnt be too hard to copy it if you want to build your own.
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Old 06-16-2009, 09:54 PM   #4
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I know it sounds cheesy, but about 100 or 200 miles before the next oil change, pour a bottle of CRC valve clean into the oil. You can usually pick it up at the local parts store. If it doesn't cure it the first time, you might have to do it twice. I have a 98 vortec dually that did the same thing. I was about ready to pull it out and get to building, but a guy convinced me to try this and it really worked. That was at around 190,000 miles. It now has 226,000 miles on it and still runs great. It's my tow rig for my toys. All I'm saying is it worked great for me and if the motor is going south it ain't going to hurt anything...
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Old 06-17-2009, 03:44 PM   #5
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Thanks for the input guys. Donuts- I will give that a shot when I get close to another oil change. I when ever I listened to it I was thinking "Man, that thing just needs a little more lub." .... Thats what she said!
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Old 06-18-2009, 09:07 PM   #6
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That noise could be an exhaust leak right at the head. It can sound VERY similar to a ticking lifter and will sometimes go away as the manifold heats up and expands, closing the gap. It would suck to spend a ton of cash on an engine replacement if the problem is something that simple.
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Old 06-18-2009, 09:38 PM   #7
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ticking

I think I would try running a good heavy dose of Marvel Mystery oil in the gas. My dad has run this stuff in all of his trucks for years, it does wonders. I would put a quart in full tank of super unleaded. I bet that will take care of the problem. It comes in a red bottle you can get it at Autozone. If you dont feel comfortable using a whole quart. I would at least use half a quart...
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Old 07-14-2009, 02:24 AM   #8
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my old '96 chevy did that since day one. I have heard all kinds of theories, piston slap, ticking lifter, rocker stud, you name it. Mine seemed to be a lifter that didnt stay primed up after parking it for the night. It ticked until the oil warmed up all the way up until i wrecked the truck @140,000 miles. I had a buddy whose truck made the same sound once he got around 100,000 miles, his turned out to be a rocker stud pulling out of the head. We just tapped the stud hole for threads w/o tearing the engine down, and put in a screw in stud. It stayed that way for the next 50,000 miles till he sold it.

All said, if the sound goes completely away after the truck is warmed up, its probably a lifter not holding prime or an exhaust leak, as was posted earlier.
Good luck!
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