I recently learned that Scott Marshall,CNC-Dude, is getting ready to publish his first manual on enhancing 235-261 performance. This first manual in a series will cover the prep of GMC rods to fit the 235-261 engines. I know lately most of you like the later versions of inlines, but I'm still stuck in the '50s.
So if interested in obtaining a copy,PM Scott through this site or
http://www.hotrodinlines.com
