Are you sure that's a Ford car shop manual?
The 279 and 317 are HD truck / Lincoln engines.
http://ford-y-block.com/Block%20identification.htm
Does it list the 239 or 256? Maybe it's an 'early' version of the manual???
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1955 TRUCK had only the 239 and 256. The 272 was not introduced until the 1956 model run.
The '54 239's, big and little is just what I call them and that is nothing official. Just a way for me to identify the early and late castings made at the two different foundry's.
KULTULZ,
Is the '56 Mercury 256 a small cam or large cam bearing engine ?
From the above you posted, I'm not sure if you meant small or large cam bearings.
Thanks, Sal
Thank you KULTULZ,
Sal