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Old 08-18-2013, 06:41 PM   #1
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Max hp out of gt 40 heads

I know it depends on cam injectors and other stuff. But in general how much hp can u squeeze out of gt 40 heads. I've seen only about 280 to the wheels so far
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Old 08-18-2013, 06:48 PM   #2
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Which version? There are a few. The old iron ones? GT-40p? Aluminum GT-40? GT-40x?
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Old 08-18-2013, 07:04 PM   #3
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Iron Gt 40 there bar
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Old 08-18-2013, 07:37 PM   #4
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300 rwhp should be possible from in injected setup with carefully selected components, 10% more from carbed.
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Old 08-18-2013, 07:47 PM   #5
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300whp is a factory freak car, most ported GT40 setups can get around 310, box stock ones... probably not.

With a S trim though you can put an easy 450whp to the ground boosting them.
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Old 08-18-2013, 10:51 PM   #6
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Yeah, out of a bolt on upgrade, you'd probably be looking at 260-280rwhp ish with supporting mods. I'd get the gt40 setup, and put an s trim on it. You keep stock drivability, and stock gas milage if you can stay out of boost.
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Old 08-19-2013, 09:40 AM   #7
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Quote:
Originally Posted by Four Eyes View Post
Yeah, out of a bolt on upgrade, you'd probably be looking at 260-280rwhp ish with supporting mods. I'd get the gt40 setup, and put an s trim on it. You keep stock drivability, and stock gas milage if you can stay out of boost.
This is what I recommend to everyone who is doing a budget 5.0 build. Gt40 heads/intake from a jy explorer, leave the stock cam alone, upgrade the fuel system, brackets from superchargersonline and a low mileage s trim from the classifieds. Cheaper than a full new HCI and way more power.
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Old 08-19-2013, 09:53 AM   #8
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This is my plan!
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Old 08-19-2013, 02:30 PM   #9
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I also forgot to mention that you should to the GT40/bolt on stuff first, THEN get the rest of the car ready to handle the 400+whp and THEN do the supercharger. There is a reason a bolt on PI car with suspension work can keep up with a new stock 5.0 at the 1/4 mile. There's also a reason that dudes with 700-800whp GT500s with little/no suspension work wonder whey they can barely run an 11...
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