CP Piston Set 20 over -17cc Dish

Bill Putnam

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I have a set of CP forged pistons new in the box with wrist pins part # S9819. 20 over (3.572 bore), -17cc dish. These were purchased a few years back and the block had to be bored bigger so these were just shelved and sat. $650 shipped. SOLD IMG_1124.JPGIMG_1123.JPG
 
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kratos2250

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I'm interested in these for my 03 cobra. Stock compression is 8:5:1 would it be ideal to go down to 8:4:1? I've always heard of people going up, not down.
 

Bill Putnam

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Although there is some debate over it stock is usually known to be -17 to -18cc so these should keep the compression pretty much the same as it was from the factory.
 

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