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Quote:
Originally Posted by 61Klassic
Hi all.
I’ve just spent a few hours this evening mocking up some stock Chevy Manley 1.6 valves with my Potvin 425 cam. I’ll be using stock non adjustable lifters so was measuring to see what valve length would be closest to get the desired lash.
One bank is spot on with a bit of grinding for the 4.911 length.
The other bank will require 0.040” longer valves.
I knew they were offset but not by that much?
What did they do from the factory? Grind the valves on one bank a lot more?
How far can you grind valve tips before going through the hardened tip?
Thanks everyone
Kev
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Hi Kev, you may want to figure out what you'll be doing for your installed spring hgts while your mocking that up??
Am assembling 2 units right now, they actually also could have used slightly longer valves, due to the 1.000" (nominal) cam base circle, but it definitely interferes with the spring hgts when you get up to that point!
Thanks, Gary in N.Y.
P.S. On both these builds we opted to stay with the std long valves and the more conventional spring package. We're using 16 lash caps on each one, fixes the small base cam problem and doesn't affect the spring numbers! We do have adjustable lifters on both and the adjusting nuts are in "deep" (more thread contact), exactly where we like to see them.