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12-17-2022, 10:09 PM | #21 |
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Re: Checking blocks for condition Pressure testing
Mine is 3/8 with 1/8 rubber glued to it. While they are cutting do the water pump plates also.
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12-17-2022, 11:30 PM | #22 |
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Re: Checking blocks for condition Pressure testing
Thanks all! I feel this is a very important topic to be discussing on the forum. With these blocks, testing is Everything. With today's labor rates a couple of cracks means a throw away, but success on a proper mag test, pressure test, and good bores, and you have something!
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1947 Tonner Pickup (red) mostly stock with exception of a cummins 6at turbo diesel, 1946 Tonner Pickup (green) with 226 cu in 6 cyl flathead, 1979 Toyota landcruiser wagon, completely encased in 1947 Ford Jailbar sheet metal. Ok, cornbinder rear fenders..... 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) Last edited by GB SISSON; 12-17-2022 at 11:45 PM. |
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12-18-2022, 04:38 AM | #23 |
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Re: Checking blocks for condition Pressure testing
The extra hole on an 8BA is a simple passage from the head face to the water pump face. It doesn't go to the water jacket as such, so shouldn't need blocking. You don't need coolant holes so it should be universal 59A/8BA.
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12-18-2022, 08:05 AM | #24 |
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Re: Checking blocks for condition Pressure testing
Mart is correct that small hole on the deck at the front edge of the block is simply a bypass hole to the water pump housing. So if you pattern the plate from the 59 type head gasket the pressure plate will work perfectly.
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I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
12-18-2022, 09:58 AM | #25 |
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Re: Checking blocks for condition Pressure testing
Hey Ronnie, I like the "universal" idea of a plate that does both 21 and 24 stud blocks. Thanks!
Another idea would be to make a thicker aluminum plate that could also be used as a honing plate when the bores are honed. I have about a 3" think one that we made for the FlatCAD - though when we recently used it, the bores showed no signs of distortion (shadowing) in the stud locations - so not really sure that it provides value. What it did help us find was some weak stud threads! Yikes! We were fortunate to find them before the block was assembled and was still at the machine shop. We used "RockMount" inserts in a couple locations - really a cool product. They are harder than Hell and really should be put in on a big Mill. But, they also would be ideal for aluminum situations. https://rockmountwelding.com/product...l/?sku=90402-2 Do you use a honing torque plate - what have you seen with shadowing when you first start the hone process? |
12-18-2022, 09:58 AM | #26 |
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Re: Checking blocks for condition Pressure testing
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12-18-2022, 10:05 AM | #27 |
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Re: Checking blocks for condition Pressure testing
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12-18-2022, 10:55 AM | #28 | |
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Re: Checking blocks for condition Pressure testing
Quote:
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1947 Tonner Pickup (red) mostly stock with exception of a cummins 6at turbo diesel, 1946 Tonner Pickup (green) with 226 cu in 6 cyl flathead, 1979 Toyota landcruiser wagon, completely encased in 1947 Ford Jailbar sheet metal. Ok, cornbinder rear fenders..... 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) |
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12-18-2022, 11:16 AM | #29 |
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Re: Checking blocks for condition Pressure testing
GB, if you have any scrap steering boxes, the column shaft tube would make good standoffs. It's 3/4" diameter and the bore should clear a 7/16" stud. You'd have to check and maybe drill it a bit, but I think it clears.
Mart. |
12-18-2022, 01:23 PM | #30 |
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Re: Checking blocks for condition Pressure testing
Or just order some DOM steel tubing - cut to length and finish the ends.
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12-18-2022, 03:12 PM | #31 | |
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Re: Checking blocks for condition Pressure testing
Quote:
Ronnieroadster
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I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
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12-18-2022, 03:20 PM | #32 | |
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Re: Checking blocks for condition Pressure testing
Quote:
We definitely use a torque plate for the competition flathead blocks there's definitely shadowing around the bores where the threaded holes are located. Considering the bore we run 3-5/16 that's enough to cause the distortion when tightening the torque plate. Ronnieroadster
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I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
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12-19-2022, 08:17 AM | #33 |
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Re: Checking blocks for condition Pressure testing
Thanks Ronnie! Was wondering what you saw with the torque plate and hone - appreciate the info.
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12-19-2022, 11:42 AM | #34 |
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Re: Checking blocks for condition Pressure testing
I too use my Honing Torque plate to pressure test.
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12-19-2022, 03:21 PM | #35 |
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Re: Checking blocks for condition Pressure testing
Our shop is equipped with a device that tests the cylinder bores with ultrasound to determine the thickness between the cylinder bore and the surrounding water jacket, and any "sand" spots that may cause failure. It has saved us from spending time on blocks that are likely to fail.
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12-19-2022, 08:17 PM | #36 |
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Re: Checking blocks for condition Pressure testing
Here's my combination 21 and 24 stud plate. I use a 1/16 rubber gasket, it holds 60 psi in open bolts holes no problem. You can see where it stretched but it hasn't failed. I didn't put every hole in the rubber gasket so I didn't need to put a bolt or stud in every hole.
For the pump blockoff plates I tried 3/16 plate, that bent and leaked at under 30 psi. So I grabbed a thick piece of aluminum, faced it and put holes in it. You don't need pretty to be effective. |
12-19-2022, 09:12 PM | #37 |
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Re: Checking blocks for condition Pressure testing
Scrap steering box? Funny you should ask. I replaced the jailbar steering box on my shop built snow plow today. You'll have to stay tuned for that in a seperate thread. Back to our regular scheduled feature, pressure testing.
__________________
Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1947 Tonner Pickup (red) mostly stock with exception of a cummins 6at turbo diesel, 1946 Tonner Pickup (green) with 226 cu in 6 cyl flathead, 1979 Toyota landcruiser wagon, completely encased in 1947 Ford Jailbar sheet metal. Ok, cornbinder rear fenders..... 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) |
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