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Re: tried to start 5.3 definetly no spark at plugs.
Does it not move at all or only a little? If it moves a little I need to deal with this in my 56 with a 5.3 but luckily my brother in law already figured it out in his LS7 swappped vette. It seems that the tach wire from the LSx ecm only supplies like 5 volts and it's not enough signal for most tachs. Most people seem to counteract it with a resistor. There are a couple ways to do it. One is inline and one requires a 12v reference wire. Just google "LS1 tachometer resistor" and you'll see how others have done it.
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