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Discussion Starter #1
What is the most you can RELIABLY bore the stock Cylinder over stock?
 

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3.937".
We've been boring the 88" to 98" since 2006, and 96"-107" since 2007 using our proprietary Wiseco/Cometic piston/gaskets kits.
We have 100's of those in service spanning Europe, all across the USA,(including Hawai and Alaska) Canada, Zew Zealand and Austrailia. :)
Scott
 

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Discussion Starter #3
3.937".
We've been boring the 88" to 98" since 2006, and 96"-107" since 2007 using our proprietary Wiseco/Cometic piston/gaskets kits.
We have 100's of those in service spanning Europe, all across the USA,(including Hawai and Alaska) Canada, Zew Zealand and Austrailia. :)
Scott
So will the 103 be a 107 at that bore Scott?
 

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So what size pistons do I need for that setup. I am getting the 1.90 valves installed with the head work I'm having done.
 

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So what size pistons do I need for that setup. I am getting the 1.90 valves installed with the head work I'm having done.
Norm, buy the flat top pistons for the 107 bore and have your boring guy cylinder match each piston and mark piston front and back. That's all you need to know on size. Now Hillside can give you exact piston size. Most use Wiseco pistons and I think the size is 3.937
 
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