Tom,i know you already got this but i am posting it here too for other watching this thread to see.
Once again,1200ppm-1400ppm ZDDP/ Zn & P is where we need to be for minimum protection when running an aftermarket high perf flat tappet hyd or solid perf cam with elevated spring rates which is what many of us are running in our SBC/BBC motors. If your running a wild flat tappet cam cam with very high spring rates you should run closer to or above the 1400ppm end of the scale for Zinc IMHO.
Not all race oils tested are what they are thought to be when it comes to zddp as you will see below,but a couple were.
So with that in mind here is some oil test data from oils i had farily recently tested to give you an idea where a few random oils stand.
Make up your own mind from there,you can choose to believe it or not,thats up to you.
NOTE: Another alternative is running zddplus or cam shield(see their websites to buy it or from ebay & eastwood auto resto catalog or website) or gm eos (from gm parts direct online which is the cheapest,a gm dealer or jeg's under cam prelube) or crane's superlube engine breakin concentrate along with any over the counter SM rated pass car motor oil to boost zddp lvl's for proper flat tappet cam protection.
JJ65,it's not "URBAN LEGEND" that the zddp lvl's @ or lower then 800ppm in todays SM pass car oils can affect hi perf flat tappet cam lonjevity with higher then stock spring rates,its a fact,you can choose to believe it or not. I have been all over this subject for the past 1.5-2 yrs and its a real issue for sure. But the ZDDP is not the end all to making a flat tappet cam live but its definately an important piece of the puzzle,thats for sure. There are many other things that will also shorten a flat tappet cam's life but i wont get into all that here as its already been beaten to death here in t/chevelle.
VALVOLINE NSL RACE(not VR1) -20W-50 - 1250/1000/890 (ALL 4 VALVOLINE OILS LISTED HERE ARE CONVENTIONAL)
" " NSL RACE -10W-30 - 1000/750/880
" " VR1 RACE -20W-50 - 1040/840/1837
" " VR1 RACE -10W-40 - 1160/912/1650
BRAD PENN RACE - 20W-50 - 770/600/1112 (SYN BLEND)
PENNZOIL GT 25W-50 RACING OIL - 1676/1483/1901 (CONVEN OIL)
CASTROL SYNTEC TRUCK & 4X4 15W-40 - 1240/990/1936 (SYN BELND)
CHEVRON DELO LE CJ 15W-40 - 1360/1115/3070 (CONVEN OIL)
SHELL ROTEALLA 30WT SINGLE GRADE -1215/1050/2350 (CONVEN OIL)
LUBRIPLATE GPO H/D 15W-40 - 1165/920/2550 (CONVEN OIL)
ROYAL PURPLE 5W30 XPR Racing Oil - 1421/1339/3039 (FULL SYN/TESTED BY FELLOW T/C'R)