ET Report Card on the Speedmaster Heads

Garrett Ellison said
What, nobody ever run 4.56 or 4.88s like a lot of the the people I know?:lol:

I ran a 383 with 4.56 and a 25" tire . was a nasty daily driver tire fryer. lol
did good with 28" x9 slick at the track though. mid 11 street car