Today I finally started the rebuild of the 4180C 80163 service replacement carb that came on my car when I bought it 3 years ago. The engine is hard to start cold and runs very rich (10.8:1 AFR) at full throttle. I have a separate thread with pre-teardown AFR measurements and questions here. I plan to continue that thread with post-rebuild tuning observations and questions. This thread will be devoted specifically to the rebuild. I've got lots of pics to post later, but already have an important question.
The throttle baseplate appears to be warped. The best measuring tool that I have is a steel framer's square, but it is new. When I measure the bottom surface of the baseplate (the part that faces the intake) from corner to corner, it appears to be pretty flat, with maybe only a few thousandths gap on one corner. When I measure across the other two corners, if I place the square flat against one corner, I can measure .020-.025" air gap at the other corner.
The new base gasket is about 1/8" thick, so is 020" too much warpage, or within tolerance? What else should I measure/check? There are probably places in town who could mill the baseplate, but likely not today on a holiday weekend. I'm tempted to put it back together and run it. Comments?
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