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Dreaded Milkshake

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Old 05-02-2008, 08:33 AM
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when i got my $7000 milkshake it was due to a cracked blocked. looked good when ran on muffs. took it to the lake, not good.

I had two grenade on my 28 years ago at the same time. Ended up being bad octane fuel. That really knocked a hole in the Summer.
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Old 05-02-2008, 01:33 PM
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The only oil heat exchanger I have is for the power steering fluid.



You must have one, oil temps would go thru the roof without one in the system somewhere. You sure on this?
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Old 05-02-2008, 04:53 PM
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You must have one, oil temps would go thru the roof without one in the system somewhere. You sure on this?
Yes sir, I am looking at ways of getting heat into the oil. It is probably due to the motor being raw water cooled. That is with oil pressure between 45-60 psi at idle/WOT respectively.

I am getting ready to tear off the manifold now to check for a water leak at the coolant crossovers.
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Old 05-02-2008, 05:09 PM
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most small blocks don't come from the factory with an oil cooler
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Old 05-02-2008, 08:10 PM
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Default Found the source of the milkshake.

I found the leak! There is a 2 1/2" long crack under the intake running parallel with the deck of the block and the lifter valley. This is common with older 350 blocks. I am sure I magnafluxed the block prior to machining it. Either I missed it initially, it cracked when torquing down the heads, or some other unknown force I am not aware of.

I am performing emergency surgery as we speak... I will post before and after pictures when I am done with the repair. The process involves drilling, tapping and loctiting cast iron pins along the crack until you reach the ends of the crack. It should be a permanent repair. I will keep everyone posted. I should have it back out on the water tomorrow.
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Old 05-02-2008, 11:29 PM
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Don't bother get another block your fix won't last if it works at all
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Old 05-02-2008, 11:45 PM
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Don't bother get another block your fix won't last if it works at all
Why do you say that? Do you think the leak will continue? Or do you think it will crack somewher else? Have you experienced the same problem before?
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Old 05-03-2008, 12:59 AM
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Why do you say that? Do you think the leak will continue? Or do you think it will crack somewher else? Have you experienced the same problem before?

Thats a sketchy fix at best. It may do the job in a car engine but your taking chances in a marine enviroment. It's that constant 4000-5500 rpms that really tears $hit up! Good luck, I hope it works for you.
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Old 05-03-2008, 07:32 AM
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Originally Posted by Westcoast View Post
most small blocks don't come from the factory with an oil cooler


No chit, guess you can always learn something here. Still makes me wonder how the oil temp dosen't just climb out of site without one, dosen't seem like there would be enough air movement thru the bilge to control it. Well, I stand corrected.
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Old 05-03-2008, 08:22 AM
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Thats a sketchy fix at best. It may do the job in a car engine but your taking chances in a marine enviroment. It's that constant 4000-5500 rpms that really tears $hit up! Good luck, I hope it works for you.
Make that 6,500 - 7,500 for this one. If I was starting with a raw block I would definitely scrap it and find a new one. This block has close to 30 hours worth of machine work. I have to at least attempt a repair. I should have it back out on the water today and I will let everyone know how it goes.

BTW, I pressure tested the repair up to 40 PSI after it was complete and found that the crack extended further than it actually appeared. I went ahead and extended the repair until it was out of sight. Hopefully I got to the end of the stress riser... We will see how it holds up.
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