ported numbers

4.320 bore w/relief 28"

intake 2.250
.1- 78.6
.2- 165.4
.3- 253.3
.4- 333.5
.5- 395.6
.6- 431.4
.7- 450.6
.8- 458.9

exhaust 1.940 open/2"tube
.1- 65.7/67.0
.2- 136.1/144.8
.3- 197.5/205.3
.4- 238.5/248.8
.5- 261.9/276.2
.6- 261.3/282.1
.7- 261.4/282.1