I too had problems like that. Had 2 NAPA HEI's and kept blowing modules. I was gettin' real good at changing modules, though. A friend of mine gave me an HEI to try, and the truck has run fine now since last summer, and the tach works right all the time now. Try a different HEI.
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Bill - Tucson, AZ
47 Chevrolet 2 dr sedan
56 Chevrolet 210 2 dr sedan
66 Chevrolet Malibu 2 dr 4 speed
71 Chevrolet C30 Longhorn
86 Chevrolet Monte Carlo SS (Sold)
01 Chevrolet Tahoe
IM - BUSTERWIVE@aol.com
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