Sb Head Flow Numbers

270's-280's int 180's-190's exh

Here are mine [j's] that I'm running on a 410 right now.
2.02-1.60 11/32 undercut at the stem and back cut, exhaust valve are ferrea.

.100 75 52
.200 142 101
.300 200 141
.400 249 169
.500 278 180
.530 281 184
.600 248 187

I used a harbor freight grinder w/ 3 different shaped '3 1/4'' long shank' carbide bits, and rolls to do a lil polishing.