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#910143 - 12/28/11 02:18 AM Stroking LS 5.3L/'327' to 383" 500+ HP/lb.-ft.
BuzzLOL Offline
Member

Registered: 05/02/06
Posts: 5577
Loc: Toledo, Ohio
We go from 5.3L to 383" with our no-longer-little LS engine.
From the January, 2012 issue of Super Chevy
By Richard Holdener
Photography by The Author

For 'Modern LS 383' the stock bore was punched out to 3.902 inches to accept a new stroker assembly. The rotating kit included a 4.0-inch, forged steel stroker crank and 6.0-inch rods from Procomp Electronics combined with forged pistons from Probe Racing. Each forged slug featured a 21cc dish which combined with the 64cc chambers on the GenX 215cc heads from Trick Flow Specialties produced a static compression ratio of 9.6:1. The TrackMax cam for our stroker came from Trick Flow Specialties and featured 0.575 lift, a mild 220/224-degree duration split (@ 0.050), and a 114-degree lobe separation angle, 1 3/4" headers.

Happy as we were with the results of the mild 'Modern Mouse 383' stroker LS, we assembled Modern Mouse 383's evil twin, 'Mayhem Mouse LS 383', nearly 600 horsepower and an additional 40 lb-ft of torque, wilder cam timing (0.624 lift, 239/247 duration, and 114 LSA), 1.72:1 roller rockers, 11.6:1, and 1-7/8-inch headers from American Racing Headers. One additional change was to substitute a set of Stage 2.5 LS6 (243 castings) heads from Total Engine Airflow.

.. Whole article:

http://www.superchevy.com/technical/engi...rt_3/index.html
_________________________
'86 Monte LS (total'd Fall '2013), '87 GTA TransAm TPI350 TH700-R4, '85 Fiero 5-speed, '75 MG Midget Buick Alum.V8 BW 5-speed manual, '77 Pontiac Astre Formula wagon 5-speed posi, '78 F150 4WD 351"M ==> 400" C6, '79 Caddy Seville Olds EFI 350" TH400, 19' Slickcraft 425HP 351W MerCruiser I/O

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#910171 - 12/28/11 09:08 AM Re: Stroking LS 5.3L/'327' to 383" 500+ HP/lb.-ft. [Re: BuzzLOL]
Jameson Offline
10+ Year
Member

Registered: 02/10/02
Posts: 3996
Loc: Elizabeth City, NC
Im impressed!
_________________________
1988 Monte Carlo SS Blown 5.3/T56 swap, Way to many mods to list.
2005 Joe Gibbs Silverado #0396



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#910178 - 12/28/11 10:22 AM Re: Stroking LS 5.3L/'327' to 383" 500+ HP/lb.-ft. [Re: ]
Joe87monteSS Offline
10+ Year
Member

Registered: 07/17/01
Posts: 4197
Loc: Memphis,TN
I would have rather used longer rods than the 6 inch and gotten more rpm out of it.
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1987 Monte Carlo SS 383
2004 Silverado
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#910225 - 12/28/11 04:38 PM Re: Stroking LS 5.3L/'327' to 383" 500+ HP/lb.-ft. [Re: Joe87monteSS]
BuzzLOL Offline
Member

Registered: 05/02/06
Posts: 5577
Loc: Toledo, Ohio
.. LOL! The 6" rods prolly already had the piston pin well into the ringpack...

.. More RPMs out of which version? Even the Mayhem 383 had what some would consider a modest cam and small heads limiting RPMs...
_________________________
'86 Monte LS (total'd Fall '2013), '87 GTA TransAm TPI350 TH700-R4, '85 Fiero 5-speed, '75 MG Midget Buick Alum.V8 BW 5-speed manual, '77 Pontiac Astre Formula wagon 5-speed posi, '78 F150 4WD 351"M ==> 400" C6, '79 Caddy Seville Olds EFI 350" TH400, 19' Slickcraft 425HP 351W MerCruiser I/O

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#910329 - 12/29/11 09:01 AM Re: Stroking LS 5.3L/'327' to 383" 500+ HP/lb.-ft. [Re: BuzzLOL]
Joe87monteSS Offline
10+ Year
Member

Registered: 07/17/01
Posts: 4197
Loc: Memphis,TN
Maybe the wild 383 would be decent. I'd like to build up my 4.8 just to be different. It wont launch well at all, but starts to pull really good around 2500 RPM.


Here's a nice 383.

http://www.chevyhiperformance.com/tech/e...ld/viewall.html
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1987 Monte Carlo SS 383
2004 Silverado
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#910337 - 12/29/11 09:57 AM Re: Stroking LS 5.3L/'327' to 383" 500+ HP/lb.-ft. [Re: Joe87monteSS]
BuzzLOL Offline
Member

Registered: 05/02/06
Posts: 5577
Loc: Toledo, Ohio
.. The LS 383" at your link apparently starts from an aluminum 5.7L, has less HP, less Torque, much less low RPM torque, and costs $12,500...!!

.. This link compares LS 4.8L and LS 5.3L buildups... since 4.8L and 5.3L both have the same bore, appears they can both be taken out to 383".

http://www.superchevy.com/technical/engi...art2/index.html

.. Here's the dyno graph of 4.8L(blue) vs 5.3L(red), HP doesn't end that far apart, and 4.8L looks to want to rev higher yet before it's done:



.. However, I'm still trying to find the part how they get the 3.78" bores up to 3.902" for the 383's... looks like nearly an 1/8" overbore... they just say they had it "punched out" to that size... reminds in the old days of boring a 283" by full 1/8" (0.125") to get a '301' in 1950's (same size as later 1960's factory 302")... this iron block LS 5.3L must have some serious meat around the cylinder bores...
_________________________
'86 Monte LS (total'd Fall '2013), '87 GTA TransAm TPI350 TH700-R4, '85 Fiero 5-speed, '75 MG Midget Buick Alum.V8 BW 5-speed manual, '77 Pontiac Astre Formula wagon 5-speed posi, '78 F150 4WD 351"M ==> 400" C6, '79 Caddy Seville Olds EFI 350" TH400, 19' Slickcraft 425HP 351W MerCruiser I/O

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#910381 - 12/29/11 05:30 PM Re: Stroking LS 5.3L/'327' to 383" 500+ HP/lb.-ft. [Re: BuzzLOL]
Joe87monteSS Offline
10+ Year
Member

Registered: 07/17/01
Posts: 4197
Loc: Memphis,TN
The 5.3 and 5.7 have the same stroke. And they only bored the 5.7 block 0.005.

Besides, I wouldn't be concerned with the low end. I'd want the RPM. And its lighter.
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1987 Monte Carlo SS 383
2004 Silverado
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#910459 - 12/30/11 06:51 AM Re: Stroking LS 5.3L/'327' to 383" 500+ HP/lb.-ft. [Re: Joe87monteSS]
84LS1T56SS Offline
Member

Registered: 12/26/05
Posts: 2701
Loc: Central, Arkansas
5.3 iron blocks can be bored all the way to 5.7 liter, then just add the 4" stroker crank. 5.7 aluminum blocks can't actually be bored any. You can only have them honed to a max of .010 oversized. A 4" stroker crank will go into an iron block without any clearance problems but in a 5.7 aluminum block, you almost always have to do some clearance work. One guy in Norway has been boring LS2 blocks .060 without any problems but I don't think anyone in the USA has had the nerve to try it yet. Everyone seems to think it will crack a cylinder, like an LS1 block would.
_________________________

85 MCSS, 02 5.3/4L60E stock daily driver, (given to daughter-in-law)
84 MCSS, Another stock 5.3/60E.

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