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Bobboloo Bobboloo is offline
Warren Hall Student
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Join Date: Aug 2000
Location: Los Angeles Ca.USA
Posts: 3,973
The published 9.5:1 ratio, with the 92mm JE pistons, was probably referenced to using them on a what was a 2.7L motor. The 2.7L motors used the same basic head and crank as the 2.4 motors so no change in compression ratio should be seen.

If the motor has been rebuilt before and the case and heads were decked then there might be a slight increase in CR after you have them decked for this rebuild but I still don't think you would need to twin plug because there is still room on the table for a slight compression increase without need for twin plugs.

As John suggested stay with the stock ports.

Warren Hall 1950 - 2008
Old 06-15-2008, 10:28 PM
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