Was helping a friend fire up a 1956 ford 223 six today. Motor had not been run in sometime. Had a trans pressure gauge plumbed into the oil gallery.



Once fired, the gauge hit almost 200psi, and blew the canister gasket out before we could shut it down. We are assuming the relief is stuck closed, but is there any other obvious causes that we should look at?



I hope you don't mind a 223 question. Thanks for any advice,

1959 and 1960 f-100sAkron OH