Jerry Branch Ported Cylinder Heads



I keep viewing ironhead Sportster heads on Ebay - and the seller describes them as "Branch heads" and they aren't...not even close.  Branch heads (at least all the one's I've seen):

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

1 comment:

Kevin said...

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...