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LS2 Intake Manifold Porting - LS2 Stealth Mods

A Ported Ls2 Manifold And Throttle Body Swap Generate 9 rwhp In Under An Hour
From the December, 2007 issue of High Performance Pontiac
By Randall D. Allen
Photography by Randall D. Allen, The Hpp Staff
LS2 Intake Manifold Porting Pontiac GTO Engine Bay
Looks pretty stock, huh? That's... 
   
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LS2 Intake Manifold Porting Pontiac GTO Engine Bay
Looks pretty stock, huh? That's the point!
LS2 Intake Manifold Porting LS6 Intake Manifold
The LS1/LS6 engines use a... 
   
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LS2 Intake Manifold Porting LS6 Intake Manifold
The LS1/LS6 engines use a "lost core" manufacturing process, which produces a one-piece manifold. Note that the throttle body opening is for a standard F-car 75mm throttle body. This manifold uses a traditional throttle cable bracket.
LS2 Intake Manifold Porting LS2 Intake Manifold
In contrast, although the... 
   
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LS2 Intake Manifold Porting LS2 Intake Manifold
In contrast, although the LS2 intake manifold closely resembles the LS1/LS6, it is a three-piece manifold that is vibration welded together. All LS2 manifolds have a 90mm throttle body opening and are set up for electronic throttle controls.
LS2 Intake Manifold Porting Three Piece LS7 Intake
For illustration purposes,... 
   
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LS2 Intake Manifold Porting Three Piece LS7 Intake
For illustration purposes, an LS7 manifold that was already "separated" will be used. Other than having rectangular ports and a slightly revised port volume for the LS7 engine, the LS7 intake is constructed using the same technology as the LS2. The lower section is in the center, the center section is on the left, and on the right sits the upper section. The center section sits in the lower, and the upper section fits over and around the other two sections. Only the junction between the upper and the lower sections is vibration welded, thus the center section is "clamped" between them.
LS2 Intake Manifold Porting 90Mm Throttle Body Opening
Note the large 90mm throttle... 
   
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LS2 Intake Manifold Porting 90Mm Throttle Body Opening
Note the large 90mm throttle body opening and the sealing surface along the entire outer edge of the lower section of the manifold. The area around where the intake is located has a sealing surface. When the manifold is vibration welded, this area isn't welded but instead relies upon tight tolerances to seal.

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