So the speedmaster heads were measured

I bought a set of there bare CNC heads ..bought their valves...retainers and locks....yes cheap....black friday prices.
Had my local machine shop do a competition valve job with PAC springs....put it on 360 with speed pro hyper pistons...old MP oval track cam .571 lift
In Vegas air it ran a best of 11.19 @ 188.56...Would run high 10s at sea level...

Got a second set done the same way in plastic bags still...A super stocker engine builder did the heads for me and was impressed with them including the quality of the casting...