Does anyone know how thick the nitriding is on the cast iron housings?  I am
lapping the irons by hand with permatex valve grinding compound and want to
know if  i have gone too far.  thanks for any help

Joe Berki

Only a couple of thou. I think it is .003.

Paul Lamar


I thought this was an interesting article:

http://www.chevytrucks.org/tech/cranks.htm

Here's another outfit that nitrides cranks - prices listed as part of
other crank services that wouldn't be applicable.

http://www.aperaceparts.com/crankwork.html

And another that lists nitriding the crank is $200..

http://v8vairs.com/theshop.htm

So, if a similar process is used for the housings as for cranks,
there's a fair amount of hardened material (if you believe the top
reference).  And, if you did grind through the nitrided material, the
cost to repair might not be the end of the world, though not cheap..

Matt-

It is common practice to re nitride lapped rotor housings.

Paul Lamar