C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Porting the Plenum and Runners...torque loss?

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Old Apr 12, 2002 | 12:00 PM
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Default Porting the Plenum and Runners...torque loss?

Iam thinking of putting this setup on my L-98....

Anybody know if it is true that your low end torque suffers? Is this mod worth doing?


jeff
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Old Apr 12, 2002 | 12:33 PM
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Default Re: Porting the Plenum and Runners...torque loss? (XtremeVette)

Jeff, I ported the plenum and the large runners. All I can say is I have no loss in low in torque. The trottle response is incredible on my 90 L98. This car respondes like a rocket. I also have a decent exuast sys. I feel this adds some to the equation also. Hope this helps.

-Dave
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Old Apr 12, 2002 | 12:54 PM
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Default Re: Porting the Plenum and Runners...torque loss? (Da-Cajun)

I had no drag strip gains after porting and polishing my runners and plenum. Others have had the same experience I have. It can't hurt, but the gains will be minimal at best. Good Luck.
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Old Apr 12, 2002 | 02:27 PM
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Default Re: Porting the Plenum and Runners...torque loss? (BobMachus)

I had no drag strip gains after porting and polishing my runners and plenum. Others have had the same experience I have. It can't hurt, but the gains will be minimal at best. Good Luck.
From my experiences and from what I have seen out there, on a stock heads/cam motor, there will be no gain from the aftermarket LTR's and ported plenum.

I just installed an Accel base with zero gain (I have stock heads/cam/exhaust manifolds).

Also, I have run numerous 12.9x's with the stock untouched TPI.

Vic
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