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Old 03-16-2004, 03:15   #1 (permalink)
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push rods

If I am going to change to a bigger flat tappet cam do I need new push rods?
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Old 03-16-2004, 15:42   #2 (permalink)
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Re: push rods

347, it depends on how much bigger.
You will definetely need to revise the geometry of your valve train
to get it to work right.
I wanted to change cams in my clevo, go from the second largest solid to the largest solid cam in the crow range.
If I had chosen to go ahead, I had to have the posts of the roller rockers machined to get the geometry right, because the spring pressure was not right on the nose.
So I needed new springs, pushrods, machine the posts, and put in the cam and lifters, was going to cost around the $1500 figure to do.
There are alot of changes needed sometimes, you need a professional to have a look at it.
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Old 03-16-2004, 16:22   #3 (permalink)
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Re: push rods

The more radical the cam, the higher the spring pressures, the more important the correct pushrod length is. I use Crow custom length pushrods in mine to get the correct geometry.

If you are not satisfied with your cam, why not convert to a roller cam? The grind can be a lot more agressive (and powerful) than a flat tappet cam will ever be.
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