anyone use 920 casting heads?

[charger318]

I was wondering if anyone has used these before in 318 to up the compression? I am wondering how the valve guides are secured to head by casting them in or by pressed in, if anyone knowsit would really help. Thanks

 

[IQ52]

The guides are cast in as part of the heads unless they have been modified.

 

[charger318]

Have you ever used these heads before? How does one go about removing the guides to change them?

 

[68GTX440]

They have to be drilled out to oversize them, then new inserts pressed in. If the guides are not to bad they can be knurled for stem seating.

 

[miller]

They have to be cut out.
There's several ways to repair, or replace guides, and you've just got to decide which way to go. Everybody has their own preference.

 

[charger318]

anyone know where to get harden exhaust seats for 1.600 valves for the 920 casting head?

 

[Meep-Meep]

There are a few sources to buy hardened seats but that's handled at the machine shop level.

 

[charger318]

So u mean when I take the heads to a machine shop they will have the hardened seats there?

 

[IQ52]

You may already know, but just in case you are not aware, the 920 heads come stock with 1.78 intakes and 1.50 exhausts.

 

[charger318]

Ya was this.king of doing 1.88 and 1.60 when getting the hardened seats done do u know the size of the combustion chamber on the 920, and the stock 318 head?