i want to change my stock piston to a aftermarket piston what piston is good for power uses normal gas and can change the piston straight away ( no need to change anything else in the engine)?
and that's why i stated it was a Kenz built +2 motor.a 12:1 piston will only work with a big cam. with a stock head and cam, you will need a race gas mix. it may work for one person and not for another. so i wouldn't risk going that high. 11.5:1 is the max safe compression for 91-93 octane.
:thumbsup: good explanation and final advice.to the OP: what is being stated with these last two posts is that cam profiles and elevation also affect fuel octane requirements as well. with the proper cam at high enough elevation, a 12.5:1 piston can be ran on 92 pump. now that you're confused i'm sure, the best advice is to call a reputable builder and request reliable advice for your specific application.