Stock 340 dyno tests?

ir3333 said

Dyno tests usually have no alternator, fuel pump, water pump, air cleaner or fan and are run through headers.

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True But that's the number were generally talking about Eg.. We say a stock 5.9 magnum is 300 hp engine, that's it's dyno trim number.

ir3333 said

And if the dyno has a happy 5% error the results could be wrong by 50hp plus!

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Your math is a little wrong unless were talking 1000+hp engine, more like 10-30 hp for 200-600 hp engines.