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Are they making 500 with full factory exhaust and accessories load ? I’ve seen similar figures with an ls3 on an engine dyno. Same with the ls1. 418 hp open header no accessories
IMO an open header and no accessory test is more like the gross hp ratings if the 60s. Your procedure does not match the SAE protocol that found 455-460 hp. Or maybe I’m off here would like to know more...
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