Thread: Any website that calculates HP?

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Anyone know of a website that will let you list all the components of an engine build and give you an estimated horsepower number? I'm not building a race car but I have two different motor combinations I can go with (basement full of parts) and would like to get a 'in the ballpark' idea of what the 2 combo's would do because,though it'll be a far cry from a race car or even considered a hotrod,,,,I don't want to be out ran by just anything!
And before I get my chops smacked,,,,(i know I will on this one but also know that this is the site that will give 'real' info) let me say that due to limited green,I am forced to use what I have.Looking for a site with calculator and not really what others would use instead of what I've got
edit: guess I should add that the choices I have to choose from will produce different power ranges but would like to stay under a certain HP but over a certain HP #,thus the request for a calculator.