I have a set I got new from Tri-State Cyl Head. $585 delivered. New castings too. Stainless valves, 1.94 I, 1.54 E &. 550 dual springs.

I have ran them for 3+ years. Matched to the right combo and a power adder, they will make enough power to break a stock block!

I made 486 rwhp with no tune and 17 lbs of boost from a Novi 2000.