Kelly hotrod - 351C motor, page 2


Left is the chamber with the seats cut for the 4V valves. The cutter was allowed to drop dowm into the bowl to help transition the seat. The right photo is the bowls with all the port work finished. Most of the work on the intake side was concentrated in the bowl and the transition area from the seat to the floor of the port. The intake ports at the manifold were port matched to the gasket and blended into the port about one inch. The intakes were not enlarged very much. Most of the actual port work was confined to the short side wall. The rest of the port was smoothed, but not polished. One port was measured - Intake volume was 179cc and the port flowed 234 cfm @ .500.


The exhaust ports and an intake. Raw and finished views are shown here. The ports were matched to the gasket and the port enlarged to that width as far into the port as possible. Care had to be taken when grinding near the head bolt hole to prevent break through. A hump in the roof of the exhaust was removed and the roof smoothed and contoured into the bowl. The floor transition was lowered a bit. Very little work was done on the floor past the hump - most of the exhaust will follow the roof out into the header. That's the theory, anyway. The last exhaust port pic was after some run time.

This is a cross section of a 1975 vintage 2V head. Note the reconfigured and super restrictive exhaust port. The red line indicates the approximate configuration of the 70-74 casting. All 2V's DO NOT have the same head. The water jacket around the guide is also not present in the 70-74 heads. You can clearly see why the exhaust port is so hard to do anything with. The Crane Energizer rockers and the adjustable rocker conversion kit are really easy to install. Things are topped off with the manifold and carb.