How long do you think it will take to lift the heads.. As long as i don't run it like that all the time it should be cool for a few good highway sprints..
12-14# as a conservative tune should be fine. but that will even take its toll. It will still be a time bomb, any more boost is just shortening the fuse. a blown head gasket is probably be the only warning and should be easy to spot from the frothy skeet that will be bubbling out.
I'm right at 14# and lifted heads at 21* spark, 11:7 commanded AFR. Never heard detonation, just ran slightly hotter than normal and overflow bottle was full, track times were slower.
Ran 12.3 with good head gasket, 12.6-12.49 with the bad ones, laid down a little up top when I got to high boost. Never heard detonation. Car has at least 30-40 WOT runs on it w/ the S-trim at 18*. About 10 runs with the higher spark before the gasket went.
This was on 137k mi virgin stock longblock.
If you are concerned about keeping it safe, I wouldn't go much over 12# and 11.5:1 @ 18deg total.
The #'s in my sig were made on 14lbs. and I was lifting the heads, and this was with ARP head bolts.
Now I run ARP studs w/ 20+ psi of boost and have no head lifting issues or no new dyno or track #'s
But come spring time, I will....