Looking for Horsepower Guesstimates on Friend's Build

The dyno or drag strip are the only way to know for sure….
True but it's not like similar builds don't make similar power, It's not like it's impossible to guesstimate a ballpark number, It mainly comes down to heads and how well the supporting parts are taking advantage of what the heads have to offer.
Everything else is speculation and bench racing… it’s like guessing how many pennies are in this jar… 1 HP per cubic inch is a good place to start as a hypothesis…

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