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Bored&Stroked · 02-18-2020, 10:04 AM

What I don't know is how deep can you go before you hit water?

Has anybody drilled an 8BA block to match the earlier 32-48 bolt holes - I have not. Do the castings have the necessary "boss" material around these bolt locations, or are you really drilling into thinner material that may not be thick enough for your planned tapping operations?

Once or if you hit water, then all the filing are going into the water jackets . . . just causing more rust/crap to sit in the bottom of them. If it was mine (and I hit water), then I would put short studs in these holes with good thread sealer on them.

If the casting does not have boss material, or is not thick enough to support a decent thread depth (and associated torque), then there may not be any value in doing this.

02-18-2020, 10:04 AM	#12
Bored&Stroked Senior Member Join Date: Jan 2011 Location: Central Ohio Posts: 5,070	Re: So I have a little problem... What I don't know is how deep can you go before you hit water? Has anybody drilled an 8BA block to match the earlier 32-48 bolt holes - I have not. Do the castings have the necessary "boss" material around these bolt locations, or are you really drilling into thinner material that may not be thick enough for your planned tapping operations? Once or if you hit water, then all the filing are going into the water jackets . . . just causing more rust/crap to sit in the bottom of them. If it was mine (and I hit water), then I would put short studs in these holes with good thread sealer on them. If the casting does not have boss material, or is not thick enough to support a decent thread depth (and associated torque), then there may not be any value in doing this.