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Old 06-19-2013, 01:28 PM
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tscalzo tscalzo is offline
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Boat: 2001 Prostar 190
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Question Anyone done a 383 stroker on their LTR?

Hello all,

First post and I'm excited to be part of the community. I've done many searches and tried researching my question but have only found loose info.

I hydrolocked my motor about a month ago and snapped a rod/cracked the block. Bummer. Long story short I'm either going to rebuild motor to stock specs OR go the 383 stroker route.

I have 2001 Prostar 190 with the Indmar MX LTR Vortec 5.7L EFI V8 chev motor.

My question is, if I go the 383 stroker route will I need to change anything on the top end? Meaning heads, cam, fuel, ect. (which I don't want to do). To my understanding I will be just fine with the stock crankshaft and vortec heads...

Has anyone upgraded to a 383 from the same/similar base model as I have?

Appreciate your input. Never worked on a chev motor, I'm an Audi guy.
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Old 06-19-2013, 02:00 PM
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aquaman aquaman is offline
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Just a hunch.....but i dont think you want to use an Audi re-power.

The 383 is quite versatile and strong........but not sure about compatibliity w/5.7 components.
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Old 06-19-2013, 02:04 PM
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j.mccreight@hotmail.com j.mccreight@hotmail.com is offline
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Welcome, not to rain on your enthusiasm but you would run into an issue of tuning the current ECM to the new stroker motor, marine ecm tuning is a specialty as not many people can do it without expensive equipment and trial and error, there are shops out there to do it just not many. Personally I would rebuild as a stock motor.
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Old 06-19-2013, 02:06 PM
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j.mccreight@hotmail.com j.mccreight@hotmail.com is offline
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Quote:
Originally Posted by aquaman View Post
Just a hunch.....but i dont think you want to use an Audi re-power.

The 383 is quite versatile and strong........but not sure about compatibliity w/5.7 components.
sure you can it's just going to be under the parent company name.
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Old 06-19-2013, 02:14 PM
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Arizona speed and marine could help you with the ECM but you are gonna pay out the nose for it. Like James said, it's gonna need some dyno work, new fuel system/pump IE more pressure and probably different injectors.

When I put a 383 in my 91 suburban it was some work. New pump, injectors, bored out TBI and probably 8 months worth of data logging and reburns on the calibration file for the ECU. I probably have 7 or 8 hundred bucks in gear just to data log and burn new chips for it.
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Old 06-19-2013, 07:18 PM
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tscalzo tscalzo is offline
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Thanks for the input gents. Not looking to delve deep into a build. Stock replacement it is.
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