Guys, I'm in the process of building a 321 inch GMC for a 50's style dragster (HA/GR) and have experienced ALL the pitfalls of building a Jimmy.
I've built a complete aluminum roller rocker assembly with 1.85:1 rocker arms. I'm also changing to 1.1" longer rods to get rid of the stock, long, heavy pistons. The head (#983) has been ported, and increased the intake flow from 170's cfm to 250's cfm. I don't know how to post pictures here but will send some if you want to email me. (Goldenri@aol.com)
Ron
