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Originally Posted by lennyrebel
The GM 4.3 is an inherently unbalanced motor because of its 90 degree block layout with 6 cyls, When they added the balance shaft it helped some. With 6 cyls. you want to stick with 60 degrees and 8 cyls. 90 degrees. That's why they were able to take massive horsepower out iof the 3.8 motor unlike the 4.3. The Rebel
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True, the 4.3L only made 190 HP, but it was a monster with 260 ft-lbs of torque. It was a great mill for the Blazer and S10 ZR2 trucks.