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If you use 2.2 pistons with the longer stroke 2.4 liter crank the CR will increase about 0.55 pts due to the longer stroke.
So 2.2T pistons would produce 9.1 CR, 2.2E pistons would produce around 9.7 and 2.2S pistons would produce around 10.3 CR with the 70.4 mm stroke 2.4 crank.
Your best bet for street driving on pump gas would be either the 2.2T or 2.2E pistons.
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Tom Butler
1973 RSR Clone
1970 911E - Sold but Never Forgotten
914-6 GT Clone
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