09-17-2002, 09:22 AM
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CC Member
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Join Date: Mar 2002
Location: so cal,
Cal
Cobra Make, Engine: I used to fix them for a living
Posts: 2,563
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Not Ranked
Richard is right on about "core shift"
You were mentioning about block seasoning as well. After lots of hot / cool cycles and tons of vibration, the residual stresses in the casting lessen. The block itself "un-stresses" itself after years of use. Some guys take new parts and have the stress relieved by the various methods: cryogenic, sub harmonic vibratory, etc. This is entirely unrelated to core shift, but important to understand nevertheless if you are building a motor on the ragged edge of parts failure.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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