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Originally Posted by david1371 Yo Rival,
The exact answer to your question is for your homeboy to go and have the car dyno'd at your local speed shop. But just a rough estimate is no more than a 15 to 20 hp gain IF everything is true. But I find it rather strange to have the exhaust ports ported & polished and not the intake. The intake is the most important. He should at least have a short ram, or cold air intake to add a few more horses. If he still has the same stock pistons and cam, his HP gain really isn't much. Now if he was "blown" or "turbocharged" now that's a different chapter.
Peace
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Yup. To get the "exhaust ports" polished, requires taking off the head....why wouldn't they do the whole head (intake too)? I would also call bull on the cam gears. If he's got cam gears for making power he must have taken it to the dyno to get it tuned. If its for real ask him for the dyno chart. Cam gears and no dyno tunig = uselessness.
Assuming everything is true, I'm guessing about a 5whp gain at the most. Exhaust mods without intake mods are hugely pointless. Why wouldn't he have something like a short ram at the least? Getting air out doesn't do any good if you can't get more in.....
Side note: I'm betting its an SLx liek resistor said
Another side note: No power steering is not fun if he plans on running rims with wider tires.....or even on stock tire for that matter...