[goinbroke2]

How tight are you torquing the intake? Too much intake torque on a SBF can lift the top off the head and produce a leak.

Make sure the intake faces are at the right angles;
I know the intake is new, but were the heads previously machined along with the intake and now your installing a stock angle intake?

Also, was the block decked at some point?

I'd try the old intake just to see. (check angles, not only straight or true)






Nitrous is like an old man with viagra, as soon as the bottles empty, your all done!