who'da thunk?

I am surprised. I've has good luck with Streetmasters before but thought the others would outrun one. I didn't think the 427 was too bad but i sure felt the RPM was better when i swapped mine. I had swapped a Streetmaster for an F427 but changed other things on the engine so it wasn't valid.

I know on my high riser it picked up a TON going to a small runner single plane from a larger runner dual plane.

Thanks for the results, you've really enlightened us all.