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WTB: M10B20 pistons 89.25+

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So, sounds like you have a 121 head and don't want to give it up. You know, of course, you'll have to modify your head to accommodate "semi-sphere" pistons.

Try shopping for Max-Sil pistons at Ireland Engineering. Or any one of a half dozen piston suppliers who do custom work (you do the engineering).

Should run you about $600/set. Click on "Site Search".

Once in a very long time sometimes an OEM MAHLE or K&S set pop up for sale on the internet, but they will cost ya. They seem to be rare as "hen's teeth", but "you get what you pay for"

Any specific compression ratio you are seeking? For an '02?, Ti?, Tii?

Best of Luck.


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yes, i have to modify 121 head and i know that i will have to modify it if i will go with semi-sphere pistons. the car is 2002 tii '73. I'm looking for compression ratio about 10-11:1, but i can modify the head if the pistons are for lower compression.

I thought Maxsil make only E12 (piano-top) and flat-top pistons? Do they make a semi-sphere or bathtub sets?

Also i have a set of 89.00 bathtub pistons from a low mile 2002 ti car that i can sell or trade. My engine block is just worn-out and i can't go with them.

07/73 BMW 2002tii Golf, powered Sunroof

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