N2OBaby

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?

Sales2@Texas-speed

iTrader: (5)

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?

RezinTexas

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

BRDMAN

iTrader: (8)

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

N2OBaby

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

Is 10.2-11.25:1 a better idea?

RezinTexas

my builder recommends 11.25 max for street engines

N2OBaby

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)?

95ONE

iTrader: (1)

Everything you mentioned, (and more) but not the stroker crank. (wish it were in the budget)

Sales2@Texas-speed

iTrader: (5)

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.

mark21742

I broke that line....I'm running 12.5:1 on pump gas....but my cam drops me down to 8.22:1 dcr

Sales2@Texas-speed

iTrader: (5)

^^And that's why I said "soft" line Good air, later IVC points, good tuning, etc make that possible!

mark21742

85 degrees after bottom dead center.....and still peppy