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What is/was it? 327, 307 or 350? '69(?) or later block as there is no vent boss at the rear. Square head 1/8" pipe plug in the oil gallery above the timing chain cover.
The short block that was in 'Old Blue' when I got him has this engine code. It now resides in my '40 Ford.
Also attached to the outside front of the valley just above the timing chain cover is a rebuilder's tag.
Product of 4 State Motor Parts, Tulsa Ok.
cyl......C
rod......A
main....A
If A = .010" then C = .030"............. I suppose.
L I B. Mortec shows the block as a '69 350, but it could have a late model cast 327 crank in it. Answered my own question I think.
Can't get my eyes to focus on the date code, battery box is in the way.
This short block had a pair of 225 hp 265" heads on it when I bought 'Old Blue'. With flat top pistons the C. R. was way up there. Wouldn't run on regular so I changed them to some early '70's smoggers. Sold the 225 hp heads to a shoe box owner in my neighborhood.