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Discussion Starter #1 (Edited)
Thunder big bore pistons for a 1500.

Ross racing forged flat top pistons, advertised at 10:1 compression. Turns your 89cui into 95cui.

Bought used off ebay so I do not know the history of these but look in xint condition.

$350

If I can't get the pics to upload in this post then I will try to add later.

Pistons2.jpg Pistons1.jpg Pistons3.jpg
 

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What other mods need to be done before installing?
 

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Is it only the head porting? A "big bore" kit implies to me that the cylinders need to be bored to accommodate a larger piston. Not correct?
 

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Yes, the cylinders must be matched to the larger pistons.
 
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