How does cid make power?

273 said

Ya but generally were talking 20-100 cid maybe up to 150 cid differences in some cases. And guess under 50-100 hp if true.

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Yup, I get that. Stroking a 318 or 340 brings 50 to 60 CID extra. Just dropping the crank kit in will maybe bring an extra 50HP but should definately give 50lb/ft. Generally if you spend that money, cam and head work or replacement heads are on the table. This is where the extra displacement really begins to shine.