My 422 smallblock build

lead69 said

So I saw you were planning on 10.75 compression, in that case I would not be afraid to run an ultradyne NR71 either.


NR 71
.020 .050 w1.5
284 255 .652

Basically I think anything from high 240s to mid 250s @.050 (depending on actual compression ratio), straight pattern, 108 ls and .620-.650 lift with 1.5s. That's my thinking,for whatever the hell that's worth lol.

Click to expand...

I’m leaning in the same direction but I think that ultradyne N71 may be just a whisker big for my application. I do think lift should be in the .615-.630 range before lash but I will probably keep duration down to 24x something. I also think lsa will be 108 or 109.
I’ve got it narrowed down to a fairly small window so I’ll probably just see who has a decent price on something within those numbers. I’m not loyal to any one brand or grinder.