I wonder if the distributor (without vacuum advance) from a 1984 Cadillac Fleetwood 368 (6.0 Liter) might be a better distributor option? What I don't know is if the 1984 Cadillac Fleetwood 368 (6.0 Liter) distributor (without vacuum advance) will actually fit in the 1976 Cadillac 500 engine. A factory fitting HEI distributor with a 7 pin module will provide a solid foundation for computer controlled timing.
A few years ago, I had shifting issues with a 4L80E controlled by an '8625 PCM. As a what if troubleshooting step I installed a '7427 (because I didn't have another '8625 to troubleshoot with) and the shifting issues were resolved. I'm still puzzled as to why the '7427 fixed the 4L80E shifting issues. The '8625 that had issues with shifting the 4L80E, is working flawlessly in another vehicle controlling a 4L60E. The '8625 was not original equipment for a 4L80E.
Knock sensors are "Tuned" to engine cylinder bore diameter. The Cadillac 500 has a 4.300" bore diameter, so perhaps the Chevy 454 knock sensor with the 4.250" bore would be a closer match for a knock sensor?
Seemingly I had better tuning results, using the newer 454 28 PSI regulator & 28 PSI injectors with a '7427. If it's possible, using stock factory injector parameters will provide a solid foundation for injector control. Was the '8625 used with the 13 PSI regulator & 13 PSI injectors on the 454 in 1993?
Most times using a combination of TBI parts that are closest to the original factory specification can prevent headaches?
dave w
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