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GILBERT CHEVROLET - GM 1986 CRANKSHAFT CHANGE INFORMATION | |
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GM changed the design of their cranksaft in 1986. This page is to help explain that change. This is one of our information documents.
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GM 1986 CRANKSHAFT CHANGE | |
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| GM 1986 Crankshaft Change |
| In 1986 GM changed their cranshaft design from a two-piece seal type to a one-piece seal type. This page is to help explain that change. |
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The crankshaft shown on the left is the 1986 and later one-piece seal type. The crankshaft shown on
the right is the pre-1986 two-piece seal type. The one-piece seal type will appear flat against the back of the engine
where the flange will be visible sticking out past the engine with the two-piece seal type. In the picture above the
flange on the two-piece seal crank is pointed out. On both small blocks and big blocks the front seal was not
changed. One-piece rear main seal crankshaft required a counter weighted flywheel to take the place of the flange weight. Adapters for one-piece seal to two-piece seal types are available to make use of the wider selection of two-piece seal cranks available. |
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