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Super A Cylinder Head Swap: Will it work?

C

CenTex Farmall

Well-known Member
The head for Dad's SA turned out to have cracks in two chambers, it's a 251172R1. I happened across a later model 366206R? that is ready to bolt on. A machine shop had done all the work and then the owner bailed and left them stuck with it.

The SA has flat top pistons so no chamber interference. Is there a difference in pushrods or rocker shaft assemblies or any other issues that would make this swap not work?
 
Good to go as long as it's a 9 bolt head and not a real late 14 bolt that was used on later c135 or c153. Rockers and rods will work as well.

Andrew
 
One of my pet peeves. Lot's of old heads will have surface cracks in the combustion chamber which does not prevent the head from being used. Most modern machine shops do not understand this and reject heads if they show any cracks, which is a good plan for modern high compression high speed engines.

What do the cracks look like in yours? It may very well need replacing but it may not. If the cracks don't go into the valve seat areas or into the spark plug hole or gasket area it might be worth saving for future use.

I learned this rebuilding 216 Chevy's in the early 60's from an old machinist.
 
One cylinder is not too bad but one of them is cracked at the corner of the combustion chamber and then the crack runs horizontally. It also needs all new seats in addition to the full complement of regular machine work for a rebuild. We decided it was too much money to put into an iffy foundation.
 
It is a 9 bolt head and dimensionally looks the same. Looking at it today the only problem I see is the C113 head gasket overhangs the chamber just a bit. May have to use later head gasket as well.
 
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