Head question, Port size vs valve size Options

[VaccaRabite]

In a recent thread I noted that the ports on my 1.7 turned 2056 heads are 47x37.5mm. I don't know what the valve size is.
Is the valve size usually the same size as the port, or smaller?
The heads are installed and I don't want to remove them unless I need to, but the engine is about to come out for conversion to EFI. The engines PO had the headwork done and I don't have all his notes.
If the valves are the same size as the ports I am going to pull the heads to have proper fitted valves for my engine.

Would too large a valve size lead to higher head temps? The PO said when I bought the motor that it ran warm and I have noted this myself even after rebuilding the bottom end in 2009. Its manageable but I do have to take care climbing hills on the freeway.

[HAM Inc]

n/a engine: ports should taper down from the port opening to the valve. This increases velocity as the air travels into the cylinder. Added velocity helps the mixture and speeds up the intake process.

True; til you get to the short turn radius and bowl area beneath the valve. 1.8 & 2.0 914 intake ports twist rather than taper as a way of enhancing mixture quality. That is a method that has gained much popularity with the high-end V8 race head crowd.

Forced Induction: Ports do not need to taper. Ports should be as large as possibe to help flow the forced air into the cylinder.

That is a popular misconception. The dimensional relationship between port and valve is still critical. The intake/exhaust flow ratio needs to be increased to around 85% for turbo engines as compared to around 75% for NA engines.