My home inspection of Speedmaster heads

Cudafever said

I think the Trick Flow is not much different then any of the SM head in the as cast condition.


View attachment 1715445774

Click to expand...

The SM hole is drilled into the chamber and threaded. A straight threaded hole into chamber. The TF’s take the additional step of tapering or flaring it out to the chamber surface like I said to about a 20mm x 16mm oval, radiused.