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I have a question regarding the potential to mix up the timing of a cam by using a cam meant for the exhaust side on the intake, or vice versa, and using the original timing marks to set the timing. I have a '77 Spider which I have rebuilt after the PO blew the headgasket. After cleaning up the head etc the cams were put back in the original places, exhaust where the exhaust cam was originally and the intake where the intake was. The car has never run well, in spite of several attmpts to tune the SPICA, new distributor and charging system. I was reading Pat Braden's book and he described a syndrome, where the car is gutless below ~3000 rpm but pulls fine above 3000, that sounded similar to mine. He suggested that this syndrome could be resolved by retarding the intake cam by a few or more degrees. I know my cams are timed according to the marks on the cam, but I also know that the cams don't exactly 'match'. One is an ALFA cam, the other unmarked. I have described the ALFA cam, and its characteristics in the diagram below. It is a 105020320001. The other is presumably an aftermarket match to this one. My question is in the next post, since I need to post another picture to address it properly. (this diagram is incorrect ...read the rest of the thread - IM)
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