the principle of a dyno is to add load and see how much torgue an engine can produce and then hp is calculated instantly with the computer.. So a dyno torque rating is as accurate as your gonna get..
ORIGINAL: twomanytoys
You really cant measure torque from the engine. There are wayyy too many variables. Flywheel size, clutch spring tension, clutch shoe size, ****ch shoe material, tuning, carb size, pipe and header combination, temperatures, clutch bell teeth size, gearing, tire size, truck weight etc... You can get manufacture ratings but this is on dyno with no load and most all are not accurate.