I read somewhere that the gmc rods were stronger than the chevy, however I was not aware the rods were longer. So if the rods are longer does the pistons need to be shorter. I am just trying to understand the concept. Is there more torque or hp advantage? I have only built 1 235 but in the future I would like to do a cadillac 261. But only after I finish this project. I would like to know more about that preformace 235 book that coming soon. Data junkie that's me.
Yes, the wrist pin location in the piston needs to be moved upward in the piston to compensate for the difference in rod length. As panic noted, this can become an expensive proposition since it will require a "custom" piston. Even back in the 40's though, speed parts were much in demand and performance piston companies of the day gladly accomodated hot rodders with their needs. Today, Ross Pistons gives generous discounts to Inliners members and has forging dies for many of the older vintage inline engines including the GMC's and Stovebolt's.
