318 valves

[Artis]

My 70' charger heads needs an oversize exhaust valves. If Im correct, last oversize valve stem diameter is 0.372' / 9.45mm.
If its >0.372' then whats the options? Valves from 340 or 360 heads? Make bore for valve guides? Change heads?
Help!!

 

[69Bee]

What you need to do is take them to a machine shop, and have them:

1) Cleaned
2) New guides installed
3) Valve job
4) Surface heads
5) Assembles with NEW valves, springs, and seals

 

[Artis]

Sooooo.....guides can be changed. Machinist told me that guides can't change, only valves with oversize. Looks like I need to change machinist. LOL

 

[69Bee]

Guides are drilled/reamed out for a 0.502" replacement guide. They can be bronze, or cast iron. I use cast iron for replacements. While some shops will ream the guides 0.015" for an oversized stem I don't do that. If you ever have to replace a valve, or new guides, everything needs to be replaced. I just had a pair of heads that the old valve stems were ground down, bronze liners installed, and finished to a smaller size. Some people seem to not care about what the next guy has to do to work on the heads...