Small Block Head Flow Chart

Iron #974
11/32 nailhead w/undercut stem 1.94/1.60 valves blended in, minor guide trimming.
--------Int--------exh
.100..64.............
.200..128.....103
.300..191.....146
.400..229.....169
.500..241.5..180
.550..241.....192
.600..240......199