318 cylinder head

toolmanmike said
The AIR system always said the injected air burned the hydrocarbons. I think it just diluted the exhaust so it would pass emissions testing. LOL

It actually burned them...in the lack of oxygen environment of an exhaust manifold the unburned fuel never had a chance to light off although 2 of the 3 parts for combustion were there (fuel and temperature) add oxygen and voom! They got burned. Dilution would not help it pass as it would still register. The BS was the open ports in the bottom of some intakes, that was just crazy if the egr valve got crud in the pintle and stayed open ....photo courtesy iceman_krebs