early heads later block ford flathead,,
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Adapting 59A Style Heads to an 8BA Block
In order to use the 59A style heads with the center water neck on an 8BA block 3 holes must be pluged. There are 2 holes on the engine and 1 on the head that will leak if not pluged. By laying a 59A gasket on the block with a few studs or bolts in place you can see which hole needs to be tapped. Use a good sharp 1/8 NPT pipe tap and light tapping oil. The tap drill size is a "R" letter drill but more than likley the block will not need to be drilled. If fact, first check that the block will accept the tap. If it's too corroded it may need a larger tap. Allen head plugs can be found in good hardware stores but if you have any problems locating some we have them here.
Best time to do this is before assembly. If you do it after it's assembled, make sure you keep the shavings out of the block. Rags and a magnet are needed. I should be using a tap handle at least or better yet a tap fixture to keep it square and straight.
Passengers side hole is partialy covered by the gasket but it will leak if not plugged. There is a water passage on the head that almost lines up with this hole which is why it also needs to be plugged.
Use sealant rated for water contact and high temperature.
Make certain you are below the deck with the installed plugs.
This hole needs to be drilled to the R drill size (.339"). Again use good sealant on it. Pretty simple but don't get in a rush or you could end up with a leaker or worse yet you could break the tap off in the block or the head.
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