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cancer1312 Dec 10th, 04, 11:38 AM Hello, I have a stock 67 396 and I know that the factory spec.'s for timing is 4 degree's btdc. I also know that the chevy engines run better advanced a bit. My question is how far advanced from the factory spec.'s can I run this motor? Thanks Roger drielly Dec 10th, 04, 12:42 PM Use the "search" feature..there are a ton of posts on this topic. sdtsdt Dec 10th, 04, 3:54 PM The best thing in this case is repeated trials. Set timing at 6 ... see how it runs Set timing at 8 ... see how it runs and so forth ... You will find some differences based on condition of engine, size and condition of carb... Do all of the things that a good tune-up involves to get the best performance. Back off of the timing to address pinging and/or hard starting. You will find your "sweet' spot. BTW, a vacuum gauge is also a good tuning tool to use ... phocksphyre Dec 10th, 04, 7:45 PM Wound up with mine at about 12 advanced. John | ||