I can't find one ANYWHERE that is precise in my spec:

Intake: 0.21-0.25mm
Exhaust: 0.25-0.29mm

I'd really like to find a set that includes 0.20, 0.21, 0.22, ... , 0.29, 0.30.

 

I bought one off the Matco truck. About $20, I think.

 

I bought mine from Sears in the automotive tools section. I have two sets, one straight and another angled for setting valve lash.

 

Did it have 2-3 gauges in your spec? The best I've found is 2 within .21-.25 and 2 between .25-.29. I'd like more precision.

How do the go/no-go gauges work? Does each gauge get wider or something?

 

My angled set has .005", .006", .007", .008", .009", .010", .011", etc. It increases increments of .001" until it hits something like .016".

The Go/No-Go gauges are thinner at the tip and thicker towards the back of the gauge, differentiated by a step about half way up the gauge. Each blade is essentially two sizes in one.