'66 Dodge D-Dart at Mecum auction

[Paul Ceasrine]

Bill,
On valve clearance. The valves were are angled at 18 degrees, entering
the cylinder. As for clearance, I don't have the complete technical info guide. But, when we put 340 exhaust valves (1.60 diameter) in one of our 273's heads, we had to slightly fly-cut the the top edge of the cylinder wall
to allow for clearance (expansion). And thats with .040 over Chrysler
10.5 factory pistons...........
As for D-Dart valve spring info. The Racer Brown #VR-18X were rated at 313lbs. closed @1.05"...150lbs. open @1.55". Free length of the spring was 2.00". The springs were outer only, no damper. Suprisingly, cannot find valve seal info. Doesn't look like a Perfect Circle teflon seal was used, may actually be a poly-acrylic standard umbrella.
Oh, that Porach Dodge photo. Is that shifter Dr. Ball-Peen is holding, is that after he just drag-raced the car. Looks like he's looking for a
garbage can, as a nice place to store that beautifully made mechanical device.
Paul