Hello All!! I worked at Diamond Racing Engines in 1973 through 1976! I saw the 1st. W2 being made out of the 340 T/A head's. They were welded up alot, and then remachined!! Butch Elkins, one of the partners in the company was the cylinder head specialist!!! He also designed the W5, W7, W8, and W9 heads for Mopar!! If you also remember Diamond also hand there own aluminum small block head! Butch also designed the Buick Stage 2 V6 Head also!! When Bob Glidden ran the small block Arrow in Pro-Stock, He was supplied three motors from mopar. One came from Diamond, another from SVI, Ted Spehar, And Bob Glidden built one to! All three motors had Diamond Head's and intake manifolds and pistons!! How's that for an accomplishment's!