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

A 383 OR 355 supercharged?

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Old Nov 2, 2008 | 08:49 PM
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Red1996SS1519's Avatar
Red1996SS1519
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Default A 383 OR 355 supercharged?
I'm debating between a 383 or a 355 for my setup and need some advice.

I have a 195cc AFR heads, LT4 intake and a vortech supercharger/intercooler, 42lbs injectors and everything ready to install, just need to decide between a 383 or a 355.

Here are the specs of the 355 :

Brand new stock GM crank
Scat forged I-beams with arp 2000 bolts
SRP -24cc dished(low compression) forged pistons .030 over
plasma-moly piston rings gapped for boost
all clevite H-bearings
arp 2 bolt main studs
It's setup for 12-15 PSI.

My goal is to reach 600 WHP. Do you think this 355 would get me there or I will need a 383. Give me some advice on a 383 build if you think this 355 wouldn't do it.
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Old Nov 2, 2008 | 08:51 PM
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383 > 355

IMO - If i was building a 383 for boost. Forged 8:1 compression and a blower that can handle 20psi on a daily basis..
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Old Nov 2, 2008 | 08:56 PM
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Money money money money money ..... The blower I got is the vortech LT1 setup, they send it with 6 lbs pulley but I want to run 12 or so
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Old Nov 2, 2008 | 09:02 PM
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Originally Posted by Red1996SS1519
Money money money money money ..... The blower I got is the vortech LT1 setup, they send it with 6 lbs pulley but I want to run 12 or so
Stick with the 355 then. With a 383 you're going to need a BIG blower that can handle lots of psi.
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Old Nov 2, 2008 | 09:30 PM
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So in other words for 12 PSI I should go with a 383?
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Old Nov 2, 2008 | 09:58 PM
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no replacement for displacement i want to get the 396 stroker kit for my lt1!
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Old Nov 2, 2008 | 10:08 PM
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Originally Posted by Red1996SS1519
So in other words for 12 PSI I should go with a 383?
S trim? Doesn't put out enough cfm to support big power with a 383. It would be a waste.
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Old Nov 3, 2008 | 08:20 AM
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355 can deffinately make the power you want. This lil 355 made 754/747 running out of fuel.
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Old Nov 3, 2008 | 08:36 AM
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Originally Posted by 1996camaross
no replacement for displacement i want to get the 396 stroker kit for my lt1!
There is a replacement for displacement now-a-days....Its measured in PSI!!
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Old Nov 3, 2008 | 08:58 AM
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the bigger the ci the more power you will make with psi......
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