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  #291  
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Interesting repair Max.
What causes the crack, geometry getting out?
Honestly, I've been through a bunch of em and I've never seen a crack there.
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  #292  
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Originally Posted by Hippysmack View Post
Interesting repair Max.
What causes the crack, geometry getting out?
Honestly, I've been through a bunch of em and I've never seen a crack there.
On the outside, usually freezing with water. All the time on marine and race engines.

The lifter valley will crack from from freezing, but it will crack from stress. The casting is thin in that area, and can be thinner than normal from core shift.

If look at the photo of the valley, you see a rust stain. That block passed a pressure test, but it was leaking a little bit at times. A magnauflux test showed the crack.

They made something like 80 million SBC’s. An avid hobby builder might never see one cracked. Most automotive machinist have seen a few.
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I did noticed the stain.
I've had a few blocks fluxed but mostly just had them dipped.

It's just hard for me to visualize enough water getting past the SBC intake to freeze the valley.
In Pontiacs I could see that happening easier without the hood.
Marine engines I hadn't considered.
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Originally Posted by Hippysmack View Post
I did noticed the stain.
I've had a few blocks fluxed but mostly just had them dipped.

It's just hard for me to visualize enough water getting past the SBC intake to freeze the valley.
In Pontiacs I could see that happening easier without the hood.
Marine engines I hadn't considered.
It’s engine that use straight water. and crack from the ice inside the water jacket. Freshwater cooled boat engines and racing engines that can’t run anti freeze. The owner forgets to drain and winterize.
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Alright, that makes sense.
No antifreeze and all bets are off.
But, that has nothing to do with the SBC (as it was intended to be used anyway).
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The SBC was OK by the mid 60s, but they still broke sometimes. Most were OK.
Now you got me thinking about a 283. Wish I had a few of those back.
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And highly dangerous...wtf is that!
It's a recycled Fiat, isn't it?
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Originally Posted by Folkie View Post
It's a recycled Fiat, isn't it?
definitely
34 cv motor of the Fiat 850, mounted cantilevered on the rear
front and rear chassis of the Fiat 126
center chassis of the Fiat 127
a rejected project of Fiat...
then a low cost car built under licence by the controlled Seat... and designed for the then markets of Portugal, Holland, Germany and Spain (sold as Seat) and the then developing markets of Turkey and South America (sold as Fiat) in the 70s
very, very ugly...
very very robust....
very very cheap...
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