How to do an engine assessment on my wifes 81A?

[david.skinner]

Hmmm - if the Canadian head is from a 46-48 wouldn't that make it for a 3 3/8" bore whereas the block should have a 3 1/8" bore?
Is it time to pull the heads off and do some measurements?
Haven't done this with a flathead before - any tricks? just a set of head gaskets in parts?
regards
David

[41ford1]

Originally Posted by david.skinner

Hmmm - if the Canadian head is from a 46-48 wouldn't that make it for a 3 3/8" bore whereas the block should have a 3 1/8" bore?
Is it time to pull the heads off and do some measurements?
Haven't done this with a flathead before - any tricks? just a set of head gaskets in parts?
regards
David

The heads will generally interchange between 221 ci and 239 ci as long as both engines are 24 stud. The Canadian head will have a CR 6.75:1 if it is the same as the US 59 head. If the Canadian C7RA-A is more common in New Zealand replace the 81 with one. I personally would not go into it to measure things until it is time to replace the head. A flathead is a pretty robust piece, don't go breaking it trying to fix something that is not critical. You will probably find more important things that need attention first. Like the fuel line.