Speedmaster 190 Data
Here is another set of CNC SM heads. Had a performance valve job done on these, flowed before and after the valve job....pretty close to your numbers.
These were new fully assembled heads. Also upgraded the valve springs. PAC 1903 installed height 1.80 @ 140 ish lbs.
Looks like the valve job picked up around 14 to 15 cfm.
Here is another set of CNC SM heads. Had a performance valve job done on these, flowed before and after the valve job....pretty close to your numbers.
These were new fully assembled heads. Also upgraded the valve springs. PAC 1903 installed height 1.80 @ 140 ish lbs.
Looks like the valve job picked up around 14 to 15 cfm.
