You sure nothing else in the timing or anything else changed? If the timing is really retarded it will run hotter but advancing the timing shouldn't cause a 23* change in temp.
Does change adv curve, engine run hotter?
I put in lighter springs so that the distributor advance comes in sooner. Now the car seems to run about 23* hotter. This is on a stock 66 396/360hp. Is this normal? Thanks.
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Yes, retarded timing will cause the engine to run hotter. A very lean fuel mixture will also cause higher temps. Any vacuum leaks? That would cause a lean mixture.
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