225 Push rod length.

pishta said

Thats .125, If you want to preserve the 'geometry' of the adjusters and the thread stickout, you can actually cut these down. You chuck them in a lathe and cut the last 1/8" of the thinwall tubing at the round end. You can tell when the thinwall is cut as it will change color to brown right before its through, then you just tap the round tips back up into the shorter tube. The tips are hardened, the tube is not. I cut down 16 225 pushrods for a 273 I built.
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You need to look at the pushrods. Some you can do that, and some not. I do that on most 170 engines I build. Cheaper then custom push rods. It seems like the 170 is more likely to need a shorter pushrod, then the 225. I used to use the old TRW 3/8 pushrod for the 225 and shorten them.

Pishta: It is really not .125. shorter that would be required. With a higher lift cam, the base circle is smaller, so the lifter/pushrod would sit lower.
Lift of the new cam .536 minus stock lift (approx .390)= .146 divided by rocker ratio 1.5 =.097
This is theoretical as there are manufacturing variations.