The Ford Barn

burly · 05-19-2023, 09:56 PM

Guys picked up a set of Canadian 24 stud heads at swap meet. One is a C91A the other C99A. Any ideas what the difference is? Thanks fellas!

V8COOPMAN · 05-19-2023, 11:59 PM

Quote:

Originally Posted by burly

Guys picked up a set of Canadian 24 stud heads at swap meet. One is a C91A the other C99A. Any ideas what the difference is? Thanks fellas!

The C91A should be for a Ford 221 cu. in. engine and the C99A should be for a Mercury 239 cu. in. engine. The C99A is likely a lower compression (larger combustion chamber) head than the C91A.

Coop

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burly · 05-20-2023, 10:51 AM

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Thanks for the info! I have not measured the transfer volume but during visual inspection they appear identical.

05-19-2023, 09:56 PM	#1
burly Senior Member Join Date: May 2010 Location: Bowling Green, Ky. Posts: 228	Canadian Aluminum heads Guys picked up a set of Canadian 24 stud heads at swap meet. One is a C91A the other C99A. Any ideas what the difference is? Thanks fellas!

05-20-2023, 10:51 AM	#3
burly Senior Member Join Date: May 2010 Location: Bowling Green, Ky. Posts: 228	Re: Canadian Aluminum heads Sponsored Links (Register now to hide all advertisements) Thanks for the info! I have not measured the transfer volume but during visual inspection they appear identical.