Magnaflux cracks – now what? | The De Tomaso Forums

lf-tp2511Member

Magnaflux testing of my original block has shown a total of five cracks (LH/RH) out of six possible, as shown in the photo below. Cracks are within the marked white lines.

Cracks are from the water jacket to the head bolt threads. No cracks running into cylinders.

I had taken note that some of the head bolts showed traces of coolant on them when removed, but no signs of any rust on any of them.

Planned engine build is 383 or 408 hydraulic roller stroker using Scott Cook heads and intake with carburetor.

Do those cracks mean the original block is now history?

Seeking wisdom and advice.

Thanks,

Larry

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11/8/1612:50 PM

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lf-tp2511Member

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11/8/1612:51 PM

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huskerMember

New block. Not worth the risk of failure.

11/8/161:49 PM

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George PAdmin.

Weld a chain onto it ....

boat anchor.

Great catch by somebody ... buy that person a drink.

11/8/166:20 PM

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Alex Joey (Guest)

PM sent

11/8/166:21 PM

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Alex Joey (Guest)

Here's an option & relatively close to you...

http://merced.craigslist.org/pts/5829209891.html

11/8/166:36 PM

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lf-tp2511Member

George,

Have you seen this type of failure before? Especially so consistent on both sides of the block?

While this local shop has almost 0 history with Cleveland's, they are a top notch outfit and know what they are doing. The owner, Steve Moody, joined the Bonneville 200 mph club this year with a speed of 263 mph.

Larry

11/8/166:51 PM

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lf-tp2511Member

Alex Joey,

Thank you very much for your very kind offer and the heads up on the Craigslist offering. I am fortunate enough to have stashed four standard bore 2-bolt blocks some years ago just for this type of situation.

I took one of them into the shop along with my original block, and that one has passed the magna flux inspection. Next test on it will be sonic cylinder wall measurements.

Larry

11/8/166:56 PM

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George PAdmin.

quote:

Originally posted by LF - TP 2511:

... Have you seen this type of failure before? Especially so consistent on both sides of the block? ...

No

Buy him a drink, or bring him a bottle of his favorite drink.

11/8/167:59 PM

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sjdennisMember

Curious as to what could cause the cracks at this location. Over-torque on the head bolts?

11/9/1610:44 AM

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ufo-lowI really DO need a bigger hammer!

While I would not spend $$$ building a rock crusher stroker with this block, I would not junk it either. With a standard performance street build, it would probably last a long time. Just my $0.02 worth.

11/9/165:26 PM

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