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Henry Schmidt Henry Schmidt is offline
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Join Date: Apr 2004
Location: Fallbrook, Ca. 92028
Posts: 6,066
Garage
Every 75-77 2.7 911 sold in California came from the factory running too hot.
This was the nature of the smog equipment.
Almost every engine ran in excess of 245 degrees. Because of the thermal reactors, they actually got hotter after the engine was shut off.
Heat is the death knell of magnesium cases.
What happens is that expansion causes the crank bore to distort. They get oblong from top to bottom with the center actually getting smaller.
Over the years I've seen inexperienced builders, go cheap on the rebuild by refusing to split the case.
What would happen is they would notice the case through bolts were loose so it seemed reasonable to replace the o-rings on the bolts and re-torque to factory specs. The result more often than not was the crank would seize up.
Is it guaranteed that a 2.7 case will need align bore? no, but I would bet on it and give odds.
As for bearing availability, Supertec has most of the odd ball bearing available.
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Henry Schmidt
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Old 04-07-2019, 11:50 AM
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