Back in '65, were Canadian blocks suffix-coded any differently than U.S. blocks?
If you mean McKinnon-built engines, no - the only difference was the first character (it was a "K" instead of "F" or "T").
OK John, you've taught me something new again..
Until now, I've known *nothing* about a Canadian engine foundry for Chevy. What years were Chevy engines built at McKinnon? I've never seen an engine so marked... (perhaps because I've always lived in the southern US, and never seen a Canadian built 'old' Chevy)... but being the curious sort, I did a little search and found several references to the McKinnon plant, and this entry on 'GM plants', which had quite a bit of detail on McKinnon Industries. http://canadianponcho.activeboard.com/index.spark?p=3&topicID=37134625&page=1&sort=newestFirst
Incidentally, for those of you as unfamiliar as I was on McKinnon, it is located in the St Catherines, ON area (which lies somewhat between Toronto and Buffalo, NY. I've excerpted some of the 'engine related entries from that weblink above, as follows:
1952: The foundry was officially opened having the largest and most modern malleable and grey iron foundry in the British Commonwealth. [CLOSED END OF 1995]
1953: Contract to build an Engine Plant at this site was released on March 31st.
1954: V-8 engines for Chevrolet, Pontiac, and Oldsmobile Rocket engines were made and assembled in the newly completed Engine Plant.
1963: McKinnons acquired the Windsor Engine Plant. Inline 6 cylinder production was transferred to St. Catharine's with local transmission production transferred to Windsor.
1966: Engine Plant tooled for '327' CID VS Engines.
1967: Engine Plant tooled for '307' CID VS Engines (dropped 6 cylinder)
1968: V-8 capacity increased to 2,400 Engines/Day
1969: Engine Plant tooled for '350' CID VS 2/4 Barrel (dropped '283'). McKinnon Industries changed from subsidiary status to become General Motors of Canada Limited, St. Catharine's.
1970: Engine tooled for 100% '350' CID VS (dropped '307, 327')
1971: V-8 Engine capacity increased to 2,600 Engines/Day.
1975: Engine Plant began producing '350' and '305' CID VS production with full flexibility.
1978: Approved to manufacture '267' Cu. In. V-8 at 1,400/Day.
1979: Corporation approval to manufacture V6 60 2.8L Engines at 1,600/Day and V-8 4.4 & 5.0 Litre ('267' and '305' CID) Engines for 1982.
1980: Capacity increase on '267' CID Engines from 1,400 - 1,800/Day.
1981: Corporate approval to provide R.W.D. V6 600 engine flexibility.
there was lots more in that article on this plant from the early 1920 thru the 1990's.. but I only excerpted the 'engine related' notes above. They also made many other car parts in that facility over the years.