C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Gm 383 hp crate engine

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Old Dec 16, 2018 | 08:09 PM
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Default Gm 383 hp crate engine

Has any forum member balance or had one of this engines blue printed? If so could you pls print improvements. How much more of a difference in HP/TQR was there. Any info will be appreciated. Trying to get all info I can before I buy one. TIA
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Old Dec 16, 2018 | 08:22 PM
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Are you referring to the HT383? If so, from the line it really should be relatively close. It was intended as a truck drop in and never was intended to go into high power applications. I'm not sure how many other 383s GM offers so if there is a high output version this is news to me. Personally you'd be better off building your own to your desired application imo.
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Old Dec 16, 2018 | 09:29 PM
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I'm referring to GM's 435 hp/445TQ it's HP 383 . Not the HT 383 truck engine. Hope that help's.
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Old Dec 17, 2018 | 12:30 AM
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Originally Posted by BV85
I'm referring to GM's 435 hp/445TQ it's HP 383 . Not the HT 383 truck engine. Hope that help's.
Well that's new to me. Personally I wouldn't touch that because I wouldn't want to void warranty just in case. That is just me though.
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Old Dec 17, 2018 | 07:08 AM
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A cam change is the only thing you could really do. Can't imagine anything else would be necessary. I'd personally get a 1 piece rear seal block if this one doesn't have it.

Last edited by cadmaniac; Dec 17, 2018 at 07:09 AM.
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Old Dec 17, 2018 | 10:20 AM
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Blueprinting will gain you very little hp. It helps with engine longevity and high rpm survival.
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Old Dec 18, 2018 | 07:03 PM
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Looks good to me. Any reason can't be used with L98 TPI intake and electronics? Other than HP loss

https://www.gmperformancemotor.com/parts/19355722.html
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