01-03-2022, 05:58 PM | #1 |
Senior Member
Join Date: May 2010
Location: Alabama
Posts: 3,257
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Block boring
Can anyone tell typically how far a 39-40 81A block can be bored ? I have a good 81A block that’s had the sleeves removed when I got it so I wanted to just go to 3 3/16” std but I have a nice already balanced rotating assembly I want to use but the pistons are 3 3/16” +.040.
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01-03-2022, 06:30 PM | #2 | |
Senior Member
Join Date: May 2010
Location: Wa.
Posts: 5,407
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Re: Block boring
Quote:
Today, the reality is, MAYBE. Rust and scale is the enemy. The only safe way is to have the block acid stripped and then sonic checked. Acid stripping is the only thing that will take the scale out. |
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01-03-2022, 07:16 PM | #3 |
Senior Member
Join Date: May 2010
Location: Alabama
Posts: 3,257
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Re: Block boring
Thanks Pete, The problem is that there is absolutely no one around here that can do either one. I might just go for it anyway. I’ve had worse things to happen.
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01-03-2022, 08:11 PM | #4 |
Senior Member
Join Date: May 2010
Location: Alabama
Posts: 3,257
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Re: Block boring
Got to looking around. I’m thinking I’ll go with std 3 3/16” pistons and I have a nice set of 29A rods and a Mercury crank to go with it. It’ll cost me a set of pistons and a balance job.
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01-03-2022, 09:31 PM | #5 |
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Join Date: Nov 2017
Location: Cleveland TN
Posts: 32
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Re: Block boring
I don't know where you are in AL but if you're anywhere Chattanooga, Roberts and Sons, 4285 Bonny Oaks Dr., Chattanooga, TN, 423 698 4097, is the place to go. I've been very pleased with their work. Bobby, the owner, races vintage flathead dirt cars.
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01-04-2022, 08:18 AM | #6 |
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Join Date: May 2010
Location: Chester Vt
Posts: 8,857
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Re: Block boring
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