Valve seat inspection

APRRSV · Jul 31, 2016

I have a couple of used 750 heads that I hope to put into service with a couple of builds I am undertaking.

My question is how one determines whether valve seats need to be replaced? This assumes that there is no obvious pitting, gouges etc. Is there a measurement that can be made to determine whether the seat has been previously recut beyond tolerance requiring a new seat?

Ed

comnoz · Jul 31, 2016

APRRSV said:
I have a couple of used 750 heads that I hope to put into service with a couple of builds I am undertaking.

My question is how one determines whether valve seats need to be replaced? This assumes that there is no obvious pitting, gouges etc. Is there a measurement that can be made to determine whether the seat has been previously recut beyond tolerance requiring a new seat?

Ed

Ed,
The intake seat will require 3 angles to get a correct seat width.
The exhaust valve -at least two angles.
If cutting the required angles means you hit the aluminum around the seat -then you need new seats. Jim

Valve seat inspection

APRRSV

comnoz

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