Hole in intake port

[nkaminar]

Ultrasonic wall thickness gauges:

https://www.defelsko.com/product-categories/ultrasonic-wall-thickness

I assume there are more brands.

The type of flux will determine if the solder will stick to the cast iron. Silver eutectic solder is a higher temperature solder and stronger than the lead-tin solders.

 

[johnneilson]

JohnNeilson, What Overhead Valve conversion would you recommend?

50, it all depends on your application.
I would assume you want a driver/touring vehicle.

Steve Serr offers the Miller High Speed Head, 2 port version.
This is a top quality assembly, he has been making them for some time.

If you want something faster, there are 4 port models available, Dan4Banger offers a Cragar 4 port and Steve has been working on one also.

I would not put a 4 port on top of an "A" model lower end, just not going to survive.

I run a 2 port Miller in one of my coups, on a B bottom end and I run a downdraft Holley 94 variant carb.
On of the best options about the 2 port head is that you can run a stock updraft carb and manifold to begin, then modify up as you feel necessary.

John