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Wondering what piston you have that u can recommend for nitrous in a 102 mm for a 690 and also if u carry carillo rods? Could i put it on or would i need to send u my crank and is there anything else u recommend putting in to beef up my motor. Looking to run a decent amount of nitrous! Any other reccomendations. Heard a few reviews on the 4 mill cranks and some say to get it and others say it may vibrate or break!
 

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Sorry for the delay, this topic did not show in bold as the new topics do so it didn't catch my attention as being a new question.

You could go with the 12 or 12.5:1 CP, I'd get the ceramic top coat and gas ports to keep the compressin ring better seated. I would not hesitate to spray nitrous on the hotrods connecting rod, I have seen one break, seen bent ones from other failures but not a broker connecting rod. If you're planning more than a 20 wet shot I would o-ring the cylinder and switch to a solid copper head gasket.
 
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