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My 03 5.3 has a 1200 to 6000 rpm cam ported heads short tube headers open exhaust cold air intake 4.56 gears and custom tune and is turning 37s. It's making 265 rwhp on the dyno so I'm wondering how much the tires affect that. A stock 03 5.3 on YouTube made 242 rwhp on the dyno.
 

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Yake is a Fgt
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Those 37's are heavy and it takes a lot of power to get them rolling and keep them rolling. I'd say it has a big affect on your hp output. roll stocks on the dyno for accurate pulls :imo
 

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I'm guessing a 212/218 cam with that rev range you gave us. With your other mods you would easy clip 300+ to the wheels with stock tires on aluminum wheels. Engine is probably pushing 400 HP at the crank. Here's the deal though you want to tune the truck as is on the dyno. Tuning with your 37s will give you the fuel map and shift points you'll want for those tires.
 

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who cares about the numbers, use the dyno to tune and see how much you gain. that's all that matters
 

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If you were looking for performance loose the big tires.
 
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