My knowledge isn't the best in this department, all I really have to go on is that I know the stock valve had a head dia of 1.32"/3.85" OA and the D production exhaust valve was 1.375"/4.04".
I have never seen a stock TC exhaust valve before so I do not know if they have the concave impression in them similar to the intake valves, but these valves did not have that. The face was flat.
Soooo, has anyone seen these valves used in a TC before? And what might the rationale be, if any, behind using high lift long duration cams, slight intake porting, stock size intake valves (engine was built to race spec in 1969 - before the "Big Valve" TC was invented), and oversize exhaust valves?
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It sounds like the engine was rebuilt in the traditional racing style of the day but they needed new exhaust valves and found something they could fit
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