1. Have numbers stamped near the intakes (on the bottom)
2. Have micro, knife edge cut valve seats
3. Have mirror polished ports (both intake and exhaust)
Later heads have a smooth intake, but unpolished as much...
4. The head gasket surfaces AND rocker box surfaces
are both surface ground (parallel)
for straightness and squareness
for straightness and squareness
2 comments:
Do you have any info/thoughts on those tiny valve seats? I would think you would want wider cuts for a more gradual corner, but obviously Jerry Branch knew about airflow...
They don't last as long, but it's all about the flow most likely? I know a bit wider seat on the exhaust valve (some-say) helps to carry some heat away from the valve itself while it's shut(against the seat on the head).
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