Quote Originally Posted by cdaniels3
Greeting everybody! I am in the process of building a 327 for my 91 cheyenne truck. The problem right now is the the current engine, a 4.3 v-6 has a bad case of preignition. I have adjusted the timing according to the manufacture spec and no change. Any idea's?

Thanks

Chuck
HI,YOU NEED TO USE PREMIUM GAS! AND MAKE SURE YOU ARE TIMING TO SPECS,,IF ENGINE IS OLD YOU MAY NEED TO FIND TUNE HER BY EAR,BECAUSE YOUR ORIGINAL MARKS MAY HAVE CHANHED WITH NORMAL WEAR AND TARE!