yep, dirty old nissan engine, I have definately accumulated too much sr20 crap to change now, I recon i have enough junk here to put together 5 running motors + spares!
yeh, 1mm oversized on both valves, i have some narprec springs, and some 'performance springs' double springs here too.
Solid lifter conversion, new rocker arms, tomie solid cams 12.5 lift 270 'advertised' duration. Adjustable gears, rocker stoppers, and titanium valve retainers.
yep what you said, expensive!
Max flow is 260cfm @ 4.5 lift, but the low lift figures are really really good, better than any other one i could find.
I found a few that had a higher flow at 4.5, but the low lift figures were even lower than an unported head.
Thanks man, you are definately on the right track for your 10, its just traction that will get the better of us.