My home inspection of Speedmaster heads

A little project that will make your home porting projects easier. I bought this many years ago but a set could be easily made in a Saturday afternoon. I won’t usually bolt a head to it until I am satisfied with my flow numbers then I will bolt it down and go to town. By simply flipping it end for end I can position a head in any angle. I’ve found things I never knew I lost looking at a head in every position