Has anyone used one of these
They're ok for a rough check. Depending on the model it's either made for valve lifts of .500 or .600. If your valve opening is more or less then you'll have to do some math. The instructions will give you the formula.
What I don't like about them is that you don't know what rocker arm they're trying to replicate. Stamped, roller. roller tipped?
I have one each of the four lengths Chevrolet marketed for their 206,216, both 235's and the 261's. There are times when one older engine will have a longer pushrod than the newer ones do. My Chevy Performance Dealer Desk still has listings for all of this plus they stock factory 261 cams for the 235's if that is what one wants as a street runner. He says he can still produce new in the box 848 head blanks too.
Using stamped rockers makes this a little harder to do because sometimes the witness mark isn't as clear on the valve tip, but if you work w/it for a bit you'll get a feel for it.
Start w/the stock length and add/remove length as needed (rarely will you need shorter p-rods).
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