Adjustable Lifters

Bruce of MN

Bruce of MN

Well-known member
What is the thread spec for double lock tappets? I am asking because if it is 5/16-24, one full turn of the adjuster would be. 041" and one flat would be .007". You can use that to know approximately how far to turn the adjuster.

I have my engine on the stand and would not like to adjust the valves in the car with the manifolds in place!
 
Bruce of MN said:
What is the thread spec for double lock tappets? I am asking because if it is 5/16-24, one full turn of the adjuster would be. 041" and one flat would be .007". You can use that to know approximately how far to turn the adjuster.

I have my engine on the stand and would not like to adjust the valves in the car with the manifolds in place!
Click to expand...

On one of the valves, measure the clearance, turn the adjuster one full turn, measure the clearance, subtract and you have your answer.
 
The rule of 9 in the link that Brent provided in Post #2 is for any kind of lifter. It is just a way of knowing which valve is at the heal so that the tappet clearance can be measured.

My engine does not have the bosses for the lifters cut so I have to have the valves up to adjust the lifters. I save time by adjusting the one that is up while measuring the one that is at the heal. So if 1 is up I will adjust that while measuring 8. Or if 2 is up I will adjust that while measuring 7. Etc.
 
I would be careful when using the the double lock lifters with the less than 1.0 inch diameter heel on the lifter.


Possible damage when using them.

Bill Stipe says right on the shipping label for the two new IB330 camshafts that I bought and printed in RED LETTERS.


"Must use Minimum 1.1 inch lifter".

Colony lifters are 1.119.

Over the years --I have seen other (new and reground) cams with the same statement.
 
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I've always wondered why they don't make those with a bigger foot. The self locking ones have a larger foot.
 
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