hows this mark look for pushrod lenght
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I am going to say go one at least one size larger and here is why.
In a perfect world, the sweep should be minimal and centered on the valve tip. What I see in the pic above is a very typical sweep (guessing ~.080") for having an emphasis on a centered pattern.
IMO and I base it on lots of research from multiple boards, I like to get the sweep minimized at the slight expenses of having the pattern off center. The bigger the sweep the more the roller tip rolls and robs power.
Obviously you dont want the pattern to off center as it could result in valve guide wear. Not a good thing.
I will guarantee that if you start lengthening the PR some, the sweep will get smaller but the pattern will start to move toward the header. I see easily going one size and maybe two sizes longer.
I am currently running 7.150" PR's and my sweep is ~.050" and the pattern is clearly a bit more toward the header compared to centered but not enough to bias the valve and cause problems. BTW dont try to get minimal sweep like .050" and a centered pattern. It is frigging impossible on these heads.
In a perfect world, the sweep should be minimal and centered on the valve tip. What I see in the pic above is a very typical sweep (guessing ~.080") for having an emphasis on a centered pattern.
IMO and I base it on lots of research from multiple boards, I like to get the sweep minimized at the slight expenses of having the pattern off center. The bigger the sweep the more the roller tip rolls and robs power.
Obviously you dont want the pattern to off center as it could result in valve guide wear. Not a good thing.
I will guarantee that if you start lengthening the PR some, the sweep will get smaller but the pattern will start to move toward the header. I see easily going one size and maybe two sizes longer.
I am currently running 7.150" PR's and my sweep is ~.050" and the pattern is clearly a bit more toward the header compared to centered but not enough to bias the valve and cause problems. BTW dont try to get minimal sweep like .050" and a centered pattern. It is frigging impossible on these heads.