1.) Would you magnaflux the head for cracks ?
Just to be sure.
2.) No porting & polishing is wanted.
3.) Valve Guides look good inside...they could be cleaned with a fine rifle bore type brush OR replace them with GM NOS new guides ?
4.) Now would be the time to do hardened valve seats on the exhaust. What would you advise ?
If the exhaust seats are to replaced......what part brand ?
Anyone have a good source based on actual experience ?
What brand of exhaust valves ?
Source for new hardened exhaust valves ?
5.)Head looks to have some very minor pitting on the sealing surface. Maybe mill it 5 thou ? And go from there.
1. Magnaflux is a non-destructive form of testing and would not harm it however the pc. must be clean.
2. Wouldn't provide any noticable benefit anyways.
3. Pressing out/replacing valve guides would immediately destroy it's NOS status. If it's new what would be wrong with them?
4. Hardened seats are a non stock modification/machining which also will destroy the NOS status. I have seen more stories of hardened seats failing/coming loose than problems associated with leaving it as is.
5. Skimming the face is corrective machining which will also destroy the NOS status.
It's probably safe to say that any interaction between a cutting tool and a NOS part means the end of that. If you intend to use the parts none of this matters.
