Spark plug gap 54' Merc. 256

If you can find original Owners and Shop manuals, that info (and much more) would be in them.

eBay can be a good source of vintage automotive service related books.

The info at this link may apply to the 272's and newer a bit more than the 239 & 256...
but here it is anyway...

http://ford-y-block.com/tuneup.htm

However or 'oops' as the case may be, I'm not seeing a spec for spark plug gap.

Don't remember what I set the plug gap at last time but 292 uses different plugs than a 256 anyway.

(edit)
From this link... looks like .035 could be a safe bet unless you have a newer / aftermarket ignition setup on the engine.

https://www.tpocr.com/ford.html

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On the '55, 272, spark plug gap is .035". They should be pretty close out of the box, but check em anyway and adjust per specs.
 
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