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Original Message
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| It should not go into a CJ block. |
| By Dave Shoe - 05/15/2001 12:02:13 AM; IP 216.243.158.38 |
It's cool that the crack was found.
That crank has life left in it in a cheap 390 stroker build-up with cast iron heads with headers and a nice aluminum intake, but not in a CJ of any kind. A good baffled-T oilpan is worthwhile insurance on the cheapo 390, though it'll certainly be destroyed in the explosion.
Assuming you get the crank at half price (maybe $200), you've just saved $200, but the whole engine build cost maybe $5000. When the $5000 is lost in a catastrophic failure, you'll need another $5000 just to get running again.
There is no economy putting a bad crankshaft in a valuable motor. If you want to buy it, that's fine. Put it in an engine that you can afford to explode, such as that core-shifted 390 block. It may never fail, but if it does, you're not gonna be kicking yourself forever over it. Instead, you'll be saying, "I knew it might do that."
Cracks form for a reason in iron. Either it's been overstrained sometime in it's 30+ year lifespan, or maybe it had a flaw in it's casting structure and the crack is now growing like a crack on a windshield. No matter what - it's a timebomb. Make sure you put it in an engine that can handle that factor.
Man, it would sure be a bummer to build a nice CJ knowing the crank was cracked. You'd never want to stick your foot into it or rev it out the way CJs like being revved out.
Shoe.
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This thread, so far...
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