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Well i don't know then because i changed the springs to the lightest ones in the distributor and set the timing so it doesn't ping. I could even advance it more without it pinging. If i back it off it doesn't run as good. Also, i don't have a lumpy cam by any means, it's a Comp Cams XE274 and i have a 2800-3200 stall. My truck has never been able to idle at 900 without it runing like crap. I also, just bought a advance timing light but can't use it till my timing indicator comes in......LOL
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