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rotorwrench · 11-21-2016, 07:11 PM

The valve angle will depend on the heads you use. If you have and older 99, 09, 19, or 29 type block (1939 through 42 239-CID), you can either use the old original 99T, 81A (big A heads), or other early type pre-war heads that are non-59 series with no problems. If you use later 59 series heads or some of the aftermarket heads, you might have to do a little bit of relief in the valve areas of the chambers to make sure they don't make any contact in there. You can convert everything to 8BA style too if you want to use a 4-inch Mercury type crankshaft.

They used to make tools to do the valve relief work but they are getting hard to find. A little work with a die grinder might do the trick too as long as you go at it in a scientific manner.

11-21-2016, 07:11 PM	#100
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,436	Re: Engine block I.D. pictures The valve angle will depend on the heads you use. If you have and older 99, 09, 19, or 29 type block (1939 through 42 239-CID), you can either use the old original 99T, 81A (big A heads), or other early type pre-war heads that are non-59 series with no problems. If you use later 59 series heads or some of the aftermarket heads, you might have to do a little bit of relief in the valve areas of the chambers to make sure they don't make any contact in there. You can convert everything to 8BA style too if you want to use a 4-inch Mercury type crankshaft. They used to make tools to do the valve relief work but they are getting hard to find. A little work with a die grinder might do the trick too as long as you go at it in a scientific manner.