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Premium Member
2015 SI 4dr
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Discussion Starter #1
Hey guys, im purchasing piston set tomorrow for my build. .I sold the 9.0:1 and decided to change to a 10.5:1 due to I think it will suit my build a lil better..its gonna be sleeved and the question im asking is should I go to a 76mm bore?..my other set was 75.50mm bore
 

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If you go 76 and god forbid anything bad happens where you have to bore the sleeves you'll have to order custom sized pistons vs if you go 75.5 and somethings happens you can get 76.
 

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So my question is, what bore are those sleeves currently? If 75mm, then I'd go with 75.5mm. If currently 75.5mm, then I'd go with 76mm.
 

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Premium Member
2015 SI 4dr
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263 Posts
Discussion Starter #8
Custom CP's aren't too bad compared to shelf pistons.
Yea I was going Arias but they didn't offer 10.5:1 and they said it was a custom comp ratio and they was wanting $690..thats a out of my budget so I just went back wit Cp's.. plus these where a off the self for $500 w/free shipping.
 

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So has the motor been ran yet @ the 75.5mm spec? Was this bore machined to match a previous set of pistons?
 
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