Old Rugged Crosser
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:
[img]http://i908.photobucket.com/albums/ac282/lvanyi/360-401%20Stock%20Heads/154_0412_amc_07_z.jpg[/img]
Stock head intake:
[img]http://i908.photobucket.com/albums/ac282/lvanyi/360-401%20Stock%20Heads/154_0412_amc_06_z.jpg[/img]
Stock head exhaust:
[img]http://i908.photobucket.com/albums/ac282/lvanyi/360-401%20Stock%20Heads/154_0412_amc_08_z.jpg[/img]
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:
[img]http://i908.photobucket.com/albums/ac282/lvanyi/360-401%20Stock%20Heads/154_0412_amc_09_z-1.jpg[/img]
:werecomingforyou:
