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woodsnake · 05-17-2006, 09:55 PM

Hello all!!
I ususally spend most of my time on mercurycougar.net, but am kind of embarrased to ask this question, as it has been beaten to death over there.
I have 1965 289 block that I had bored .030 over, and installed an edelbrock performer rpm cam. It specs at .496 int and a .520 exh.
I am having a very hard time keeping pushrods and now roller rockers in this stupid thing!
My question is this:
For those of you that have dealt with a dual pattern cam before, is it necessary to perform valve adjustments differently than with a less agressive cam? I followed the directions in the 68 Ford manual to the letter, and got 8 bent exhaust pushrods.
I replaced the damamged pushrods and adjusted the assembly again, this time only taking the slack out of the rockers, not the pushrods. Thirty minutes runtime later, I get a horrible knocking noise and a broken roller rocker. The only thing I can think of is that I need to do a 'hot' adjsutment, with the engine running and tightening only until there is no more rocker noise.
Does any one here have advice??

05-17-2006, 09:55 PM	#1
woodsnake woodsnake Join Date: May 2006 Location: Nampa, Id Posts: 17	dual pattern cams Hello all!! I ususally spend most of my time on mercurycougar.net, but am kind of embarrased to ask this question, as it has been beaten to death over there. I have 1965 289 block that I had bored .030 over, and installed an edelbrock performer rpm cam. It specs at .496 int and a .520 exh. I am having a very hard time keeping pushrods and now roller rockers in this stupid thing! My question is this: For those of you that have dealt with a dual pattern cam before, is it necessary to perform valve adjustments differently than with a less agressive cam? I followed the directions in the 68 Ford manual to the letter, and got 8 bent exhaust pushrods. I replaced the damamged pushrods and adjusted the assembly again, this time only taking the slack out of the rockers, not the pushrods. Thirty minutes runtime later, I get a horrible knocking noise and a broken roller rocker. The only thing I can think of is that I need to do a 'hot' adjsutment, with the engine running and tightening only until there is no more rocker noise. Does any one here have advice??