High rpm miss

aaronk785 said
OK. Went out tonight and double checked everything. Yesterday was wham bam quick check pattern. Today I got more precise. Cleaned every thing and rechecked pattern. This time I set lash and used a magic marker to mark the valves. The dymek was chipping off. Lash wasn't perfect because I just used the edge of the valve. Lashed at .022. This helped. The way I see it is it shortens duration and raises the rocker another .015 or so before it makes contact. Anyway I'm getting about .033 now and about .110 to .115 from the edge of the valve with the 7.1 pushrods. Take it this all being measured with a magnifying glass and a dial caliper. Having crisp lines to measure helps. New springs coming with taller coil bind height. Should be .094 from bind. Thinking about going with what I have. SO close.

I always try and stay near the .050 between coils rule of thumb...years ago, maybe iir even said by smokey, or was it that circle track article from the 90's... you get the maximum performance and less harmonics iirr pushing that spring for all its worth.
I've played with springs, 'while on a least resistance faze' and let me tell ya... if you're going to play with Springs do it on a motor with tons valve to piston clearance. You need to have the right spring rate and as much Seat pressure as you can 'reasonably speaking' stand ...and not destroy anything.
I tried few diff comp sets and found vsi's dug into and shiny retainers..lol... couldn't hardly feel it , but it was happening and pure luck I didnt eat one... well, that and the mile of valve clearance I had in that 340. Good springs, k motion. Look at a set if those is my advice.