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Old 10-04-2003, 09:37 AM
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73 chevy 454 valve adjustment

Guys I have a question on valve adjustment for a 73 chevy 454 w/h rv cam
and hydraulic lifters and daily driver. I have a low rpm stumble on take off from dead stop and have reviewed many articles on the internet to find that some guys claim that is said to be that the valves are to tight .Now with that being said, I set them 1/2 turn after "zero lash" and they claim that 1/8 to 1/4 should be used ,start at 1/4?Also claim higher RPM can be acheived by this setting.

Here are the websites I referenced:




Last edited by heinzeroth; 10-04-2003 at 09:37 AM.
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Old 10-04-2003, 10:19 AM
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Sounds like you need to tune your carb for the stumble.
What type of carb do you have ?
Luv the smell of NITRO in the morning.
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Old 10-04-2003, 12:31 PM
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1/4 turn is 100% BETTER Performance!

Edelebrock performer #1407 750cfm

I adjusted my lifters to 1/4 turn past "zero lash" and the stuble dissapeared and motor purrs like a kitten all the way to 6000 rpm! What a difference between 1/2 turn and a 1/4 turn,leaves room for error in detecting zero lash so valves are guarrented to be closing all the way!
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Old 10-04-2003, 01:58 PM
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What a lucky break for you. You managed to post for help and within in hour or two already corrected this 'supposed' valve lash concern and test drove for a smooth 6,000rpm run. By the way would it be a coincidence that you joined just as our 'friend' Edge was suspended??? '73 454??? Wouldn't be out of a numbers matching vette would it???


Last edited by dmorris1200; 10-04-2003 at 02:23 PM.
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