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rotorwrench · 01-24-2022, 01:41 PM

The part number suffix designates the size for the different part numbers. I don't have a Canadian chassis parts book for Ford or Mercury but they may be the same suffix that Ford USA used.

Canadian production followed USA production relatively close in the 8BA years. The 8BA block was used till a change was made in early 1951 for the rotator type valve train and the crankshafts to work with the automatic transmissions. The 1BA block remained in service till the end of flathead production. Ford & Mercury cars all used the common block for the date of manufacture. The crankshaft and pistons are the only internal differences between the 239 and the 255 CID engines in the 8BA era.

USA sizes
6261 no suffix is standard cam bearing
6211-C is -.010" con rod big end bearing
6331-E is -.020" rear main bearing
6333-F is -.020" front & center main bearings

01-24-2022, 01:41 PM	#8
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,440	Re: Canadian rebuild tag identification The part number suffix designates the size for the different part numbers. I don't have a Canadian chassis parts book for Ford or Mercury but they may be the same suffix that Ford USA used. Canadian production followed USA production relatively close in the 8BA years. The 8BA block was used till a change was made in early 1951 for the rotator type valve train and the crankshafts to work with the automatic transmissions. The 1BA block remained in service till the end of flathead production. Ford & Mercury cars all used the common block for the date of manufacture. The crankshaft and pistons are the only internal differences between the 239 and the 255 CID engines in the 8BA era. USA sizes 6261 no suffix is standard cam bearing 6211-C is -.010" con rod big end bearing 6331-E is -.020" rear main bearing 6333-F is -.020" front & center main bearings Last edited by rotorwrench; 01-24-2022 at 02:05 PM.