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Ralph Moore · 09-20-2013, 09:45 PM

I know there was a thread recently about heads, but I can't seem to find it.
What are the markings 29A-LH and 29A-RH? Are these Mercury?

Second question, what size is the crank nut on a 59AB style block?
I can't see it well and I don't have a spare laying around to check.

I'm trying to free up an engine in a 47 Business Coupe, I am soaking with MMO, but it's been sitting since 1968, and I'm afraid I may have to pull the heads.

09-20-2013, 09:45 PM	#1
Ralph Moore Senior Member Join Date: Oct 2010 Location: North Pole, Alaska Posts: 1,470	Two questions I know there was a thread recently about heads, but I can't seem to find it. What are the markings 29A-LH and 29A-RH? Are these Mercury? Second question, what size is the crank nut on a 59AB style block? I can't see it well and I don't have a spare laying around to check. I'm trying to free up an engine in a 47 Business Coupe, I am soaking with MMO, but it's been sitting since 1968, and I'm afraid I may have to pull the heads.