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#21
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“It takes considerable knowledge just to realize the extent of your own ignorance.” Dr. Thomas Sowell |
#22
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Retired ASE master engine machinist here as well. Have ground, polished, and balanced my share of rotating assemblies and have seen far worse than the above get by with just a polish job. As said a 010 re-grind won't significantly affect the balance. Factory assemblies are usually far worse than that. And let's not forget this is the street section.
[edit] Maybe one of the worst cranks I fixed was a 400-N which came into the shop as scrap because it spun #5 rod bearing to the point of turning black & blue. Actually had 0.080" run-out at the center main journal. After passing a complete wet mag test I set out to heat & bend it back into submission with oven & hydraulic bender. Balanced then ground at 020m/030r that crank has been running in my 69 GTO for over 20 years now.
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1969 GTO hard top ~ Std bore 400, '70-RA3 block, 670 heads, Bal. & Blue... M22, 12-bolt w/3:55s Last edited by GRX; 03-14-2014 at 06:07 PM. |
#23
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Quote:
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“It takes considerable knowledge just to realize the extent of your own ignorance.” Dr. Thomas Sowell |
#24
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I wouldn't be concerned about a "ten-under" crank grind affecting balance in the real world. MAYBE a polish would clean-up the score decently enough; it's tough to tell via photograph versus in-person. |
#25
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“It takes considerable knowledge just to realize the extent of your own ignorance.” Dr. Thomas Sowell |
#26
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#27
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Looks like most of the machined surface is still there. I would hit it with a green scuff pad to knock off the high spots then assemble with new stuff. Sleep easy.
Lately I've been using the Lucas assembly lube.
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Bull Nose Formula-461, 6x-4, Q-jet, HEI, TH400, 8.5 3.08, superslowjunk |
#28
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Precision assembly is the way I was taught many years ago. Bud (my mentor) didn't differentiate between race or street engines. They were all built to a specific stardard. It was probably overkill, but I know of only 1 warranty "come back" that he ever had.
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“It takes considerable knowledge just to realize the extent of your own ignorance.” Dr. Thomas Sowell |
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