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I have a set of comp cam push rods 7970 lenght 7.75 I am installing a mech comp cam that calls for 7972 7.80 lenght. (roller cam, rockers etc). Will the 7970 work?

tony
 

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I have a set of comp cam push rods 7970 lenght 7.75 I am installing a mech comp cam that calls for 7972 7.80 lenght. (roller cam, rockers etc). Will the 7970 work?

tony
Itll work but it won't be right.correct push rod length is very important....thats why they call for specific lengths.bm
 

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How are they going to guess at the required pushrod length? They don't know where your deck height is, or how much your heads have been cut, or your spring height, or any other variables that can affect your pushrod length.
Mock up the engine, and measure the pushrod length for YOUR engine, not something that looked good on paper.
 

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Too many variables just to say that a specific length will work without actually checking. Best way I have found is with an adjustable/ split pushrod.

This has the range you need. Or you can make your own from an old pushrod.
http://www.summitracing.com/parts/TFS-9001/
 

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How are they going to guess at the required pushrod length? They don't know where your deck height is, or how much your heads have been cut, or your spring height, or any other variables that can affect your pushrod length.
Mock up the engine, and measure the pushrod length for YOUR engine, not something that looked good on paper.
much better answer then mine:yes:bm
 

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push rods

Use lash caps.
Mike
 

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Lash caps would make the valve stem height taller. His pushrods are shorter than stock so this would aggravate the mismatch. I agree he needs to quit guessing, measure and get the correct pushrod length.
 

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Here ya go....
http://www.trendperform.com/measuring.html

and the adjustable pushrod...
http://www.trendperform.com/tools.html

To do it right, you'll need a 12" caliper to double check the actual length of the adjustable pushrod after adjusting.:yes:

I usually just remove the outer springs and color the tip of the valve with a Sharpe. The rocker will leave an obvious mark that can be measured. You want the NARROWEST mark on the valve tip. It might not be perfectly centered......that's not uncommon.:rolleyes: As long as the mark is even laterally. If it's not it means the rocker stud is not parallel to the valve.:eek: That happen on occasion as well and it's better to catch it now than deal with it later.:yes:
 
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