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post #103 of (permalink) Old 06-13-2019, 10:15 AM
65Sprint
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Join Date: Jul 2004
Location: Fountain Inn, SC
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From the latest plug pictures, the two left plugs still look lean, maybe leaner than in the first set of pictures. I remain skeptical that lean mixtures are the problem. I would follow Pete's procedure and confirm there isn't an air bubble in the cooling system. Belts and suspenders... bleed the system at the water pump and at the intake manifold as well as leaving the radiator cap off until the thermostat opens. When you have exhausted other possibilities, then maybe focus more on the Dellortos. Your 132 main jets are small and I have not found any useful information on the .12 emulsion tubes. Does that matter wrt elevated engine temperature? No one can really know without experimenting with new parts and/or using a wide-band AFR meter.

Rich Hanning
'65 Sprint GT, '78 Spider, '88 Quad
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