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I Have 10.5:1 Arais Pistons For The All Motor Engine I Am Building. I Bought The Pistons Thinking They Were 11:1 Comp. I Was Wondering If I Do Some Shaving, Around How Much Compression I May Be Able To Make. Or If I Should Go Fetch Some Zc Pistons. I Would Like To Sit Between 11:1-12:1.
 

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I Have 10.5:1 Arais Pistons For The All Motor Engine I Am Building. I Bought The Pistons Thinking They Were 11:1 Comp. I Was Wondering If I Do Some Shaving, Around How Much Compression I May Be Able To Make. Or If I Should Go Fetch Some Zc Pistons. I Would Like To Sit Between 11:1-12:1.
I did the same thing. My arias pistons said 11:1 in the advertisement but upon closer inspection of the data sheet that was when using a vtec head.
I'd just go with a thin MLS headgasket from a Y8 or Z6. Also, like Bigtuna said you can always have the head milled.
 

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would shaving the block deck a bit be an idea?
I'm not sure if that would have the same effect as milling the head or not. I know you can only deck a block so much before the piston would make contact with the head though...
 

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I almost had the same thing happen, but caught it at the last minute. I actualy called arias though and had them make higher comp pistons. It's really not that much more then the shelf pistons. Just another option.
 
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