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Build my 383!!!!!!!

This is a discussion on Build my 383!!!!!!! within the Internal Engine forums, part of the LSx Technical Help Section category; special care needs to be had with piston selection ..a custom piston where the wrist pin is in the ring ...

  1. #41
    King 0f n00bz shady milkman's Avatar
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    special care needs to be had with piston selection ..a custom piston where the wrist pin is in the ring pack is a good choice when going the 383

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    Rice Killa JwMonE99's Avatar
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    But Lt1s 383 are still ok right?

  3. #43
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    lt1 have a different bore and stroke then a ls1..so they get to 383 a little different ..i dont/ havent heard about a lot of problems with lt1 383

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    Ok thanks for clearing that up.

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    Quote Originally Posted by JwMonE99 View Post
    Ok thanks for clearing that up.
    A local the 383 is doing him just fine.

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    Quote Originally Posted by shady milkman View Post
    the rod and crank combo essentially
    the piston's compression height push the wristpin too far into the ring package, which reduces piston stability at higher engine speeds.
    the 383 kits use the same rods and crank as the 408s do

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    Quote Originally Posted by squee View Post
    I don't see what your getting at. I don't care for 1000hp, all I was saying is the motor I have was built with a 1000hp turbo setup in mind. The compression is because of the heads he bought. He spent all the money he had on the shortblock, so he bought a relatively cheap set of Patriots to run lower boost on until be could go with some Trick flows and lower the compression and bump up the boost. I don't need to rethink my setup at all. I know what I have, and I know what I want. Since my car is gonna be a DD, I don't want 1000hp. 600-650 with almost instant torque is more than enough for me, and the compression IS ideal for what I want. Which will be probably somewhere around 7-10psi and nice cool IATs. I guess I can see where my post was misleading, but I don't expect to get 1000hp with a MP112 Magnacharger kit. I just want around 600, maybe 650.

    Oh, and the part about no motor being built to a certain amount of boost is somewhat true, but also BS at the same time. Yes, stock motors have seen 20PSI, but really, how long do they hold up? All I was getting at was the the 383 I have was built with 20+psi of boost in mind and 1000hp and still hold together since it was gonna be a track only car and get the living shit run outa it.
    never seen a maggie make 650 rwhp. cool IATs? whats considerd cool? every maggie setup ive seen the IATs at end of the run was well into the 100s. those arent cool temps

    as long as the stock motor doesnt denotate it will last just as long if not longer then a built motor. reason forged motors seem to last longer cause they are more forgiving. a stock and "built" motor all use same designs to assemble. failure cause of bearing or etc can happen with either motor.

    also PSI is measurement of restriction. so 20psi of this motor isnt 20 psi of that motor

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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by Quik View Post
    the 383 kits use the same rods and crank as the 408s do
    apples and oranges

  9. #49
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    Quote Originally Posted by c5z28 View Post
    A local the 383 is doing him just fine.
    not saying 383s are bad..but there is no such thing as a budget 383..and just that special care needs to go into planning it.

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    I am attempting a budget 383 lt1.
    Last edited by JwMonE99; 04-10-2009 at 07:14 AM.

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    Quote Originally Posted by shady milkman View Post
    apples and oranges
    is it really? same deck height, different cylinder bore. both use 6.125 rods and 4" cranks

    i personally never heard of any 383 failures

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    Quote Originally Posted by Quik View Post
    is it really? same deck height, different cylinder bore. both use 6.125 rods and 4" cranks

    i personally never heard of any 383 failures
    If I remember correctly this is incorrect the stroke length for LT1s and SBC are different (than LS1s) when they are stroked out to 383s.

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    Quote Originally Posted by Bottesini View Post
    If I remember correctly this is incorrect the stroke length for LT1s and SBC are different (than LS1s) when they are stroked out to 383s.
    i think he is referring to lq9s 408s

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    yes both the 383 and 408 share a 4" crank and a 6.125 rod length

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    Quote Originally Posted by Quik View Post
    never seen a maggie make 650 rwhp. cool IATs? whats considerd cool? every maggie setup ive seen the IATs at end of the run was well into the 100s. those arent cool temps

    as long as the stock motor doesnt denotate it will last just as long if not longer then a built motor. reason forged motors seem to last longer cause they are more forgiving. a stock and "built" motor all use same designs to assemble. failure cause of bearing or etc can happen with either motor.

    also PSI is measurement of restriction. so 20psi of this motor isnt 20 psi of that motor
    You've never seen a maggie make 650? Its not that uncommon. The MP122 on a nice 402 or such will make well over that. Only thing is a MP122 won't fit under the hood of a F-body.

    And no, a stock motor WON'T last as long or longer than a built motor. Its just not gonna happen. The stock crank and rods are fine, but the problems aren't those, its the rod bolts mostly.

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    Quote Originally Posted by squee View Post
    You've never seen a maggie make 650? Its not that uncommon. The MP122 on a nice 402 or such will make well over that. Only thing is a MP122 won't fit under the hood of a F-body.

    And no, a stock motor WON'T last as long or longer than a built motor. Its just not gonna happen. The stock crank and rods are fine, but the problems aren't those, its the rod bolts mostly.
    your right your absolutely right. upgrade rod bolts and the motor will last. the tune is what kills motors. Im pretty sure i know about pushing stock motors.

    a maggie on a 402 only doing 600 is a pure waste. a stroker with good HCI should be around 600 rwhp if wallet allows it NA. if your boosting a stroke'd motor yoru goal should be no less then 900rwhp. Even the TVS line isnt going to get those numbers. Centri blower or a turbo will easily get those numbers.

    but i guess i have not aware of what FI is capable of but, curious since you know so much wheres your FI experience? I know at 19 i sure didnt have a budget to afford a nice FI setup.

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    quik your kind of a ass..is that why you got banned from tech?

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    Quote Originally Posted by shady milkman View Post
    quik your kind of a ass..is that why you got banned from tech?
    no, ban was cause of a local crybaby cried to admins.

    not being an ass just telling it like it is. 383 LS1s make good power. Out tuning one yesterday.

  19. #59
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    Quote Originally Posted by Quik View Post
    no, ban was cause of a local crybaby cried to admins.

    not being an ass just telling it like it is. 383 LS1s make good power. Out tuning one yesterday.
    its fine...i love it. are there even anymore admins over there ? ..i am not saying 383s are worthless..just saying there really is no such thing as a budget 383..need to spend the money right to make it reliable..just as much as 408s ect

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    Quote Originally Posted by Quik View Post
    your right your absolutely right. upgrade rod bolts and the motor will last. the tune is what kills motors. Im pretty sure i know about pushing stock motors.

    a maggie on a 402 only doing 600 is a pure waste. a stroker with good HCI should be around 600 rwhp if wallet allows it NA. if your boosting a stroke'd motor yoru goal should be no less then 900rwhp. Even the TVS line isnt going to get those numbers. Centri blower or a turbo will easily get those numbers.

    but i guess i have not aware of what FI is capable of but, curious since you know so much wheres your FI experience? I know at 19 i sure didnt have a budget to afford a nice FI setup.
    Your completely right, I have no forced induction knowledge what so ever. There isn't a Syclone sitting in my driveway, nor is there a turbocharged Camaro sitting in it either. Wait a second...There is.

    Did I say only 600? No, I didn't. As a matter of fact, the number in question was 650, and I said a 402 with a MP122 will make well over that. I can't remember exact specs, but I saw a 402 I believe making well over 700 in fact. But see, something you probably have yet to realize is that a maggie is gonna make INSTANT torque. As in, off idle. There was a basically stock Camaro with a MP112 on Tech that made over 450 foot pounds before 3k RPMs. The curves shot pretty much STRAIGHT up. I'd be happy with 600 on my 383 and a Maggie, cause thats very conservative and will be streetable since my car is gonna be my DD. I said it once already. I don't want a 1000hp DD. Its not even practical. If you have so much FI knowledge, you would know peak numbers aren't shit. 900 isn't even impressive if you can't get it to the ground. Its pure overkill. And lastly, my age has nothing to do with anything, but if it helps ease your mind, I was just recommended for a job as a BMW tech so a maggie kit isn't gonna be shit. I could buy it right now if I wanted. All I need to do is sell my turbo.

    Quote Originally Posted by shady milkman View Post
    quik your kind of a ass..is that why you got banned from tech?
    I'd agree, he is an ass.

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