Hey guys, here are some real good cross sections of the AMC head. Shows where the room for porting lye's. Stock vs. the Indy 401 head.
Indy 401-SR The intake floor on the Indy 401-SR head is smoothly radiused in its approach to the valve bowl. It has generous 235cc intake runners -- 69 cc's larger than typical high-perf AMC heads:
Stock head intake:
Stock head exhaust:
Indy 401-SR
The exhaust side has the most "sweeping" changes. Note the Indy 401-SR head's smooth and consistent cross section. As-delivered volume on the enlarged port is 105 cc's, yet it still exits in the stock location:
:werecomingforyou:
