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Re: 1972 GM 350 throbbing engine vibration
Exactly which balancer was installed? With the false claim that 8" balancers are unavailable I'd start my search there. I'd also check that flexplate verifying that is non-weighted neutral flexplate. I'm also wondering what if anything they did to the crank and new pistons before reassembling the short block? Was the crank polished and balanced with the new piston bob-weights? A high frequency vibration (faster than the rpm) that follows the rpm is likely internal "if" that new balancer checks out...
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Michael of the clan Hill,
"Two Seventy Two's"
71 1-ton Dually 350 4-Speed
71 C/50 Grain Truck, 350 Split-Axle 4-Speed
02 3/4 ton Express
14 Indian Chief Vintage
1952 Ford 8N, "Only Ford Allowed On The Property" 
"Be American, Buy American" 
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