[sideoiler10]

I have several books on the 427 center and sideoilers. Nothing is written to indicate that a NASCAR block is any different than the factory FOMOCO 427 blocks. Probably the only differences might take place during the engine builds by the race team, as Holman-Moody did in the 60's. There might have been a few minor tweaks to improve oiling but I have not read of them anywhere. I think most of the teams of that era actually used the same LeMans rods produced by Ford because the entire rotating assembly was made from forged materials and were the best available at the time.

Many very knowledgable people will tell you that the 427 sideoiler is probably the best true high performance engine that was ever mass produced for production cars. Of course the SOHC that followed in late 64 and 65 was probably THE best, but they were outlawed by NASCAR and were limited to drag race teams. But these engines were hand assembled and never "mass" produced.