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Post Info TOPIC: Adjusting lifters while running on 403 Olds V-8 in 1979 Pontiac Trans Am.


Uber Guru

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Adjusting lifters while running on 403 Olds V-8 in 1979 Pontiac Trans Am.


I am helping a good buddy of mine with his 1979 Pontiac Trans Am. It has a 403 V-8 Oldsmobile motor in it and i just replaced all the valve stem seals on the motor. My question to the brotherhood that might know is this. What is the best procedure to adjust the valve lifters while the engine is running. I have put the nuts where they were previously but now i want to do the final adjustment with the motor running. Is it 1/4 turn, 1/2 turn or full turn to put the lifter at 0 lash and fully adjusted after the backing off to let it tick. I do not want to under or over tighten for obvious reasons. Any help would be greatly appreciated. Cheers. George.



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Canadian Poncho Superstar!

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George, believe there is no adj. on those Olds engines, does it have a short rocker strap across the int. & exh. rockers??? If so you just crank em down full[ but equally or you'll break the rocker strap] & lifters will adj. themselves!!! Similar to the US Poncho's theres no adj. on those either but they don't have that rocker strap!!! Pete

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A Poncho Legend!

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It's been a while, and I've never rebuilt an Olds engine but I recall selling the "pivot" as GM calls it for those engines. I'm pretty sure you just tighten them down, no adjustment.

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Canadian Poncho Superstar!

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X3 .... Olds uses a bucket and shim design tighten em down..not sure on the torque spec..somewhere around 45 ft lbs?  

There is no lash adjustment...just like an American Pontiac as stated !



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Canadian Poncho Superstar!

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rabbit64cs wrote:

X3 .... Olds uses a bucket and shim design tighten em down..not sure on the torque spec..somewhere around 45 ft lbs?  

There is no lash adjustment...just like an American Pontiac as stated !


The torque for those I "believe " is in  "inch" lbs.  been there done that etc. & broke a bolt off !!!! 



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I can only please one person a day, today is not your day!!! Tomorrow isn't looking  good either.   !!!!!!!! BLACKSTOCK Ont.

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