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Old 10-04-2003, 09:39 AM
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big block chevy 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:

http://www.centuryperformance.com/valveadjustment.asp

http://www.2quicknovas.com/happyvalves.html

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Last edited by heinzeroth; 10-04-2003 at 09:39 AM.
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Old 10-04-2003, 11:09 PM
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Interesting. I have a friend that builds mean motors for race cars and he adjusts them a full 3/4 of a turn. I have always stayed at 1/2 turn. 1/8 after 0 lash is a bit to loose don't you think?
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Old 10-05-2003, 05:34 AM
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BBBs stumble

BBB it could be that its just a little lean for a second as you crack the carby open 36 willys was talking about accelerator pumps
and lean out the other day somthing to do with the vacume drop
off as those big butterflies open the spill from the main jets drops off the acelerator pump must take up the slack im off to look at those sites now the stuff above just came to mind
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Old 10-05-2003, 07:49 AM
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I normally go 1/2 turn, so you should be a long ways from to tight.
you need to check out the carburetor, possibly the acc. pump or the air valve adj. HTH

Troy
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