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In theory flat top pistons and a small chamber head are the most efficient as they promote faster flame travel/combustion.
In the real world a domed piston in a 'smog' head with a lager chamber work well, I built a 350 chev using large chamber 70s heads with domed Badger pistons, I installed a fairly mild Comp Cams cam at the same time.
These budget mods transformed my engine and its still running strong 10 years later.
 
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