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Old 09-18-2023, 06:26 AM   #7
Ironangel
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Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
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Re: Adjusting valve clearance on a 454 V8.

Quote:
Originally Posted by paintinx View Post
These are the tec specs of my car

Suburban 1979, 7.4 Ltr VIN: TCS269F528860 T - GMC C - Serie S - 7,4 Liter - 4BBL Carburator - 2 - 3/4 ton 6 - Suburban 9 - last digit of model year (1979) F - PlantCode (Chevrolet Flint) 528860 - Production Sequence Number CARBURATOR: 17059520 / And maybe it is better to use this link

https://youtu.be/5EGlb_VpTAw?si=fuzntC7Wnu-v9Z2-
That video is of no use to anyone but the mechanic in a shop with the motor on a stand and the intake out of the way. Your 7.4L (454) is a Hydraulic Flat Tappet motor unless someone has stuck a roller cam and lifters in it. I have to agree with Rusty and KWmech and Geezer too. Pull that valve cover and find the noise maker. Use KWmech's method and be spared all the confusing details of finding TDC and using the EOIC method. One last thing, I cant count the number of times, myself included, that an exhaust leak is mistaken for a noisy lifter or loose rocker. Check those manifolds for leaks...
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