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I think the idea of cutting the actual combustion chamber is more for raising the compression in a specific area where combustion will occur . While flat top pistons are the more prevelant design hemi domed pistons have been used over the years .The Stihl 038 AV for example used both a hemi...

I cut the piston myself .The reason as I see it for a raised dome is to direct the sweep from the transfers around the intake side of the piston .It's not to raise the compression as some might think . Not that's is ultra important just something I do .I got the idea from a Ford 3. liter Vulcan...

"Tighten the squish" meaning cutting down the combustion chamber size ?Well that's one option or approach I suppose .Not one I practice but it works for some people . If you didn't either remove the base gasket or cut the cylinder base to raise the compression by raising the exhaust you've...

Well you did something wrong then because they respond very well .What exactly did you do to screw it up? Okay here's what I did ,cut the cylinder base so it had about 20-22 thou piston to head deck .Cut about a 12-15 thou raised dome piston widened the intake ,widened the exhaust port and...