07-03-2012, 11:09 PM
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#7 |
 Toyota Racing Development Join Date: Apr 2007
Posts: 5,038
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The 6M came in a couple different cars but none which came to the US with it. It was the last engine in the MKII lineage. The 6M crank is lighter and allows for a higher red line than the 7M crank. The 7M crank is heavier and better balanced but comes with the penalty of a 250 RPM reduction in red line. The 7M crank started making its way into the 7M engine around '88 but through '89 (possibly '90) it was possible to end up with either one in your 7M. The first telltale sign was the red line as indicated by the red mark on the tachometer face. Naturally, you can't rely on that so much these days though as the gauge could have been swapped anytime in the past.
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