| I feel the first step is a refresher on the terms commonly used to lablel the nastys within the as cast passage. |
| On post '73 castings. the thermact-air bump is drilled to carry air from the smog pump. Passage is accessed from firewall side. Passage is plugged on front side with a small welsh plug |
| On post '73 castings, the thermact-air boss is drilled to carry air from the roof passage and inject it into the port. Adding oxygen to the exhaust stream helped to complete the burning of the unburned hydrocarbons. |
| Note drilled hole in t-boss. This D3VE-A2A head is from a '75 A code Ranchero |
| Step by step porting guide for D0VE passanger car castings. This is the first of multiple sources of information. Read them ALL before attempting to port your castings |
| There are subtle differences from the early to the late castings with regard to short turn shape as cast. These differences are note throughout the guide as a "Whole" Read all 5 guides BEFORE starting your porting project |
| index |