So I got the bad news that one of the pistons is chipped due to nitrous. So the motor is out and I want to do some upgrades, now that I have the opportunity so my question is should I go with bigger pistons ? And should I use the stock rods? This guy is telling me to do 20 over on pistons. Iam also gona do the upgrade for E85? What else should I do?

 

You still have a 04 cobra right? If so inspect your rods and get them checked out at a machine shop and if they are still all good use them, ive seen cobras go well over 700 hp with stock rods.

And you wont notice much of any of a difference by going with 20 over pistons, you will see a little more torque on the dyno but not enough to feel while driving

 

Thanks for your reply I do still have the 04 cobra. And I did take it to a machine shop they are also gona port my heads will that make any difference ?

 

where is the piston "chipped"

 

It's more like a gap on the corner .. They said it was because of the nitrous not ever using that again

 

Id get some stronger pistons thats about it, unless it needs to be honed/bored might as well go .020. dont forget a bigger fuel system for that E85. Nothing wrong with nitrous, just may have been at the pistons limits or had it setup correctly.