Recommended PR length with F13 ?
02-24-2009, 05:14 PM
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Recommended PR length with F13 ? I have seen people run 7.40 and 7.425, what is the best length to run? Or what is the proper length? any help would be great, thanks in advance.
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02-25-2009, 09:00 PM
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"You can run the stock length 7.400" or a 7.425" to make the valvetrain a little quieter. Either pushrod will make the same power.
Thanks,Allan"
from my email. guess either is good!
Thanks,Allan"
from my email. guess either is good!
02-25-2009, 10:55 PM
#11
What your not taking into consideration is the smaller base circle of the new cam. Using the 7.425s will help make up for that loss in pre-load. On XE-R grinds the base circle is ~.050 smaller (not sure about cam motion lobes). So on paper the 7.425s is what you would want with an XE-R profile.
However, I do recall the actual stock push rods that are said to be 7.400s, and the aftermarket units that are said to be 7.400s, differing in actual length when I measured them with my calipers a few yrs back. I wish I remembered which one was longer as that will play a role in which length to get to keep the pre-load the same as stock.
However, I do recall the actual stock push rods that are said to be 7.400s, and the aftermarket units that are said to be 7.400s, differing in actual length when I measured them with my calipers a few yrs back. I wish I remembered which one was longer as that will play a role in which length to get to keep the pre-load the same as stock.
