Mine is a 58 Star Mainline. Its has a 272 which has been bored to 292.
I have a brochure for the 58 Star model with specs. I am having trouble posting the pic here. but a bit of what is advertised states:
FORD V8 MAINLINE COUPE UTILITY
ENGINE- V8 O.H.V.
Bore and Stroke - 3.626 x 3.30
Piston Displacement - Cubic capacity 272 cu. in.
Compression Ratio - 7.1 : 1
292 is not mentioned but it may have been an option.
This compression ratio in the brochure of 7.1 : 1 got me looking at the compression ratios listed on the cylinder head charts again.
I can't find those numbers. It is referring to cylinder head compression isn't it?
http://www.ford-y-block.com/cylinderheadchart.htm