Posted By: mopster
Indybrock flow results & pics - 10/14/14 08:20 PM
I just finished a set of small block Indy T/A heads, or Indybrocks, whatever you want to call them. This was not a typical porting job, but a very extreme one, and the casting was taken to its limits. I haven´t seen too many flow results of these heads so I thought I´ll share mine.
Beside porting and seat work the only modification was bigger intake valves. Port volume is 220cc. Minimum CSA is 2,70 at the push rod, and throat CSA is 2.75 . Port entry dimensions are 2.40” x 1.18”, and entry CSA is 2.76. Average air speed at the pushrod was 280fps, and highest local air speed was 380fps at the middle of sst apex. Air speed was measured at .550” lift/312cfm flow. At .600” lift air speed was 8fps higher.
And now some pictures.
Beside porting and seat work the only modification was bigger intake valves. Port volume is 220cc. Minimum CSA is 2,70 at the push rod, and throat CSA is 2.75 . Port entry dimensions are 2.40” x 1.18”, and entry CSA is 2.76. Average air speed at the pushrod was 280fps, and highest local air speed was 380fps at the middle of sst apex. Air speed was measured at .550” lift/312cfm flow. At .600” lift air speed was 8fps higher.
And now some pictures.