327 chevy oil sending unit

I have a 1967 327 chevy out of a 67 nova.The oil sending hole is not 1/8" pipe thread .It seems to be metric w/ finr threads.Was thinking it could be a canadian block. Any ideas

 

It should be a 1/8-27 pipe thread!!

 

Never seen a small block that was not 1/8 NPT. You sure there is not some kind of adapter fitting in the block? Even Mexican blocks are 1/8NPT.

 

g,day from oz , that seems strange , i have a 327 in my pontiac parisienne which i am told comes from canada and it is NPT thread , i work in a hydraulic shop and i sell heaps of brass adapters for chevy's and they are nearly all NPT , have you tried to fit a BSPT plug / threaded adapter to check if it isnt tapped out to bspt . AS bspt will go into NPT , but NPT wont screw into bspt , I hope i havnt confused you , let me know how you go , cheers bundy

 

Something I forgot . The hole is in between 3/8 and 1/2"

 

Pipe thread is pipe thread...there is no metric

You probably just have some damaged threads, get a tap and run through it

Canada did not go to the metric system until the 70s...Even then, the auto companies were slow to change things.

 

where is this hole? is it behind the distributor or someplace else?

 

behind the distributor

 

i gotta see that , can you post some pictures?

 

My 1965 327/365 is regular if it's assembled run a tap down there with vasoline on it

 

Has it been re tapped 1/4" pipe?

Tig