[Roadsters] Was cleaning carbs / Now pre-ISO threads

[hallosb at juno.com]

Pre-ISO metric screws?? Never heard of such a thing. And I thought the
clutch head screws on my '56 Chevy were unusual. 

This might explain those impossible to find replacement screws.  When I
disassembled my heater valve, I lost a screw I couldn't replace.  Same
thing happened with the original alternator.  I have a thread gauge and
every once in a while I find an unusual thread I can't match with any
standard sizes either metric or SAE.

Most everything on my '66 is SAE but, it seems like some of the parts do
use metric threads. Do our cars have a mixture of both SAE and metric?

Dan McHatton
'66 1600


 
On Tue, 18 Dec 2007 11:38:42 EST Keith0alan at aol.com writes:

Be very careful with the dome and float cover screws.  They are pre-ISO
metric and are impossible to find as they have not been made 
 for decades.
  
 keith williams