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Crash tell me everything you know...
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<blockquote data-quote="mthompson223" data-source="post: 1145321" data-attributes="member: 16755"><p>The 4.3L received a balance shaft for the 1992 MY. The 4.3L is a 90* V6 with offset/split journals to help with the vibration problems of a 90* V6. The 90*V6 with offset/split journals helps solve the firing order imbalance that would result if a 90*V6 had a "normal" crankshaft with shared journals on two adjacent cylinders. The pre-1992 4.3Ls had secondary balance issues due to the 90* V6 design that couldn't be solved by any amount of journal offset; so, GM decided to install a balancer shaft in 1992 to help counteract those forces.</p></blockquote><p></p>
[QUOTE="mthompson223, post: 1145321, member: 16755"] The 4.3L received a balance shaft for the 1992 MY. The 4.3L is a 90* V6 with offset/split journals to help with the vibration problems of a 90* V6. The 90*V6 with offset/split journals helps solve the firing order imbalance that would result if a 90*V6 had a "normal" crankshaft with shared journals on two adjacent cylinders. The pre-1992 4.3Ls had secondary balance issues due to the 90* V6 design that couldn't be solved by any amount of journal offset; so, GM decided to install a balancer shaft in 1992 to help counteract those forces. [/QUOTE]
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