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LT4 on the 350

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Old Nov 19, 2003 | 03:39 PM
  #1  
therckid's Avatar
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From: Jax, Florida
Car: 1986 Trans Am
Engine: 305 LB9 TPI
Transmission: 700-R4
LT4 on the 350

Well can this be done. I saw the LT4 conversion kit from summit, and was wondering if i could put it on the 350 TPI engine? I mean it guarentees 425+ HP, it guarentees this when converting a LT1 to an LT4, which would mean a small HP decrease from 425 with this particular upgrade, but still. Has it been done, can it be done, i need the info guys.
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Old Nov 19, 2003 | 03:59 PM
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TheViper's Avatar
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From: Fredericksburg, VA
Car: '84 Z28
Engine: 350
Transmission: th2004r
i don't think so.

i think holley has a systemaxII or something for about $1300 that gives 425hp.
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Old Nov 19, 2003 | 04:00 PM
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therckid's Avatar
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From: Jax, Florida
Car: 1986 Trans Am
Engine: 305 LB9 TPI
Transmission: 700-R4
i am not a big fan of carburetors, i like fuel injection much better, with my experience more dependable.
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Old Nov 19, 2003 | 07:33 PM
  #4  
therckid's Avatar
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From: Jax, Florida
Car: 1986 Trans Am
Engine: 305 LB9 TPI
Transmission: 700-R4
alright, how do people put them LT1s on the L98 motors, mybe i could do the exact same thing to mine except use the LT4, anybody though of this thouhg?, migth give you an excess of 425HP.

and i just looked up SystemMax and its for Ford Engines.
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Old Nov 19, 2003 | 07:40 PM
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From: Colonia,NJ
Car: 88 Firebird Formula
Go to www.LT1intake.com. John's very helpful and he will give you lots of info.
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Old Nov 20, 2003 | 03:14 AM
  #6  
John Millican's Avatar
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From: Savannah, GA
Car: 1997 Jeep Wrangler
Engine: 4.0L
Transmission: 5 speed
Axle/Gears: 8.8 rear, 4.56 gears, 4:1 transfer
Yes it can be down. The heads will have to be converted from reverse cooling to standard cooling and the intake will have to be modified to accept a distributor.
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Old Nov 20, 2003 | 05:04 AM
  #7  
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From: Arthur, Ontario, Canada
Car: 92Z28, 99SS, 83Z28 & 86GTA
Engine: 421, LS1, 327Turbo & 383
Transmission: T-56, 4L60E, T5 & 4L60
Axle/Gears: 4:10, 3:42, 2:73 & 3:27
Not so sure its really worth the $ of the kit and the $ of the conversion after that. I think u can get more for less $
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Old Nov 20, 2003 | 09:02 AM
  #8  
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From: Nebraska
Car: '89 Formula
Engine: 355
Transmission: 700R4
Axle/Gears: 9 bolt
I agree, the LT4s are good flowing heads, but for the cash to buy the heads and convert everything, youd probably be better off with std. SBC heads and a converted LT1 intake. There are other ways of making 425+ hp than just that combo.
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Old Nov 20, 2003 | 12:20 PM
  #9  
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Ja. Der 383 stroker tested by CHP with TFS 23° heads and HT383 GM crate shortblock made 490HP at the crank on pump gas, which should theoretically make about 420HP at the rear wheels (or 445HP with synthetic trans and axle oil).
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Old Nov 22, 2003 | 05:24 PM
  #10  
therckid's Avatar
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From: Jax, Florida
Car: 1986 Trans Am
Engine: 305 LB9 TPI
Transmission: 700-R4
well since i use only sythetic oil in my car, axle, transmision, and engine oil, would that make my car have more than the stock 190HP at the wheels?
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Old Nov 22, 2003 | 11:15 PM
  #11  
scottland's Avatar
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From: Phoenix, AZ
Car: '82 Z28
Engine: 350HO
Transmission: M4
no. because your car DOESN'T make 190 at th wheels, it makes 190 at the flywheel. and depending on the current running condition of the motor, and its mileage, it might not even be making that. but assuming it is in good running condition, all synthetic oils should help you pick up 10-15 flyhweel horsepower.

so you could be at 205fwhp.

but definatly not 205rwhp on a stock L03 ( i assume)
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