LT1-LT4 Modifications 1993-97 Gen II Small Block V8

what kind of power does a 383 make?

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Old Mar 1, 2010 | 12:42 PM
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Default what kind of power does a 383 make?

bought a car from a guy says it has a brand new 383 in it.motor looks new inside sounds good has an lt4 intake(its red).cant tell anymore than that car is wrecked but driveable took it down the road runs fine.i dont know what they normally make. thanks for any help robby
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Old Mar 1, 2010 | 12:45 PM
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Originally Posted by yodas little brother
bought a car from a guy says it has a brand new 383 in it.motor looks new inside sounds good has an lt4 intake(its red).cant tell anymore than that car is wrecked but driveable took it down the road runs fine.i dont know what they normally make. thanks for any help robby
Anywhere from 200HP to 1000HP.

Without knowing the headwork (if any) and valvetrain, it's impossible to take any kind of accurate estimate. What other modifications can you see?

A red intake doesn't necessarily mean it's an LT4. Lots of guys paint and powdercoat their intakes red nowadays.

The larger displacement facilitates the HP produced by the valvetrain. Displacement alone doesn't make the power.
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Old Mar 1, 2010 | 01:04 PM
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Originally Posted by yodas little brother
has an lt4 intake(its red).
Just cuz it's read don't mean it's lt4. Never assume
383's are done for torque. they will make a little bit more hp but more torque for sure. How much? like ramair said. what parts are on it.
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Old Mar 1, 2010 | 06:03 PM
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it has roller rockers,msd opti(or at least cap),msd ing.,lt's,i dont know anything about the heads other than there clean.the cam is pretty choppy.thats all i can see really.
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Old Mar 1, 2010 | 06:04 PM
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LT4 intakes are internally the same as an LT1 intake. If it genuinely is an LT4 intake on LT1 heads take it as a NEGATIVE indication of the quality or rather lack of in the research that went into the build.

A realistic range for strokers is stock power to about 450rwhp for hydraulic cammed. Not many hit the 450rwhp number though.

LOTS of people blindly believe displacement is key and in their quest neglect heads, use a cheap off the shelf cam, heavy pistons with thick parasitic rings and weaker than stock cast cranks. VERY few folks I would be willing to buy a "built" motor from because so many are done so badly.
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Old Mar 1, 2010 | 06:07 PM
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and theres an arizona speed throttle body.thanks for the input gentlemen
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Old Mar 1, 2010 | 07:03 PM
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Do the heads have anything stamped on the front of them?
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Old Mar 1, 2010 | 07:06 PM
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Tell them you want the complete list of modifications before you spend a dime.
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