only about 5 mins, just set timing at 2,500rpm 34deg vac plugged on carb and dizzy ( fire core vac dizzy not the RTR), thought it could have been a hella air bubble trying to burp out, but it didn't seem right so i shut it down and it kept spewing brown *EXTREMELY HOT WATER* every where, I just finished retorquing the head studs to 80 ft/lbs per ARP instructions, all but 2 moved, started it back up same issue, belt not hooked up and still puking fluid out of the rad fill hole, so heads are coming off, off to the shop for a magnaflux and pressure check, i may say f it and quite wasting money on these iron heads and go with some 440 source heads,

-Mike