5.3L to 383 CID

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Dec 22, 2011 | 04:54 PM

N2OBaby

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From: North Central Ohio

5.3L to 383 CID

I have seen on the internet where 5.3L blocks can be bored to LS1 size and with 6.20 rods & 4" crank it makes for a 383.

It would be nice to have a 11-12:1 CR with RHS or TFS heads(I hear LS3 heads don't work with 3.902 size bore) for use with E-85 & a N2O cam(112-116+LSA).

Anyone doing this here?

Dec 22, 2011 | 04:59 PM

Sales2@Texas-speed

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https://ls1tech.com/forums/search.php?searchid=16270505

There are a LOT of people doing this and posting about it often (more often 6.125" rods instead of 6.200" though). What questions do you have about it?

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Dec 23, 2011 | 05:44 AM

RezinTexas

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From: Katy, TX

This is what I'm currently building:

2004 LM7 block
3.903" bore
6.125" Scat I-beam rods
1.110" comp height, -3cc Wiseco pistons
4" crank, brand not yet decided
block deck machined to -.010 piston deck height
Target is 11.1 SCR

Here is a good read for you:
http://www.truckinweb.com/tech/engin...ild/index.html

Dec 23, 2011 | 10:12 AM

BRDMAN

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From: RGV/956

it can be bored to a 3.902 in which you can build a 382 or if your going stock stroke it will be a forged 5.7l

Dec 23, 2011 | 09:28 PM

N2OBaby

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From: North Central Ohio

What is the effective CR limit for 91-93 Octane with aluminum heads?

Is 10.2-11.25:1 a better idea?

Dec 24, 2011 | 08:18 AM

RezinTexas

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From: Katy, TX

my builder recommends 11.25 max for street engines

Dec 28, 2011 | 01:05 PM

N2OBaby

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From: North Central Ohio

I was wondering if using an LS2 intake & ported LS6 intake as well as a LS6 cam on a 383(5.3L stroker) would perform well(but on a smaller budget)?

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Dec 29, 2011 | 11:05 AM

Sales2@Texas-speed

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It would be very difficult to draw a hard line limit for static compression on pump gas. There are way too many variables involved: weather and climate, the rest of the engine combo, vehicle specs, application, etc. Many will draw a "soft" line around 11.5:1 static, which will allow for many to run pump gas, but definitely make sure your builder has the entire combo purpose built with pump gas in mind.

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