Orr89rocz wrote:I would leave the 1.5 rocker for now and focus more on valve control with the springs. You should have the 8019 upgrade spring which installed at advertised height is 150 lbs seat pressure. I would feel abit more confident revving over 6500 with the springs shimmed alittle to 165-170 lbs. i did this in my afr 195 head 383 with 230 deg .603" lift cam. Afr valves are light tho so maybe 150 will get it done but my cam guy felt i needed 165 lbs and i never floated a valve to 7000 rpm where limiter was set.
Thats probably .015" shims which will bring max lift safely to .635" which your cam would exceed with 1.6's. ( i cant remember what i used but the install heights were 1.775 i believe) However thats borderline because i noticed these springs do have a tighter coil bind height than advertised so could likely get away with mild shim and 1.6 rockers. The spring specs should include .050" coil bind clearance in that .650" rating so thats more like .700" til bind. If you ran say .030-.040 to coil bind, just may clear 1.6's and still beable to shim for pressure.
Thanks for the feed back...
An yes I do have the 8019 upgrade spring on my AFR 210cc heads and the springs are 650 lift, i'm not really sure about the coil bind clearance @.050, but u say it should be max at 700 right if it say 650lift for the springs???
I'm just a college kid leaning more about performance engines and getting good Tips advice &opinions for my first engine build, from guys like U
. But what do u mean by the shims? I don't really understand that part, and would the shims make the springs a 165-170 lbs seat pressure instead of 150 lb seat pressure???