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Switch to 3" or stay 2.5"?? EVAC system or not?

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Old Nov 8, 2007 | 08:48 AM
  #1  
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From: LONDON, KY
Car: Camaro
Engine: Carbed L98
Transmission: TH350
Axle/Gears: 3.73
Switch to 3" or stay 2.5"?? EVAC system or not?

Right now I am running Hedman 1 5/8" LT's with dual 2.5" pipe into 2.5" Dynomax Bullits. They dump before the rear.

I was thinking of staying with the Hedman LT's and going to 3" pipe and bullits. Do you think this will help my car? What about a X or H pipe?

I have also thougth about switching to Hooker 1 3/4" Lt's. Am I going to notice a difference over the Hedmans?


I have been playing around with the idea of installing a Crank Evac system. Not a pump, just plumb it from the valvecovers to the collectors. What are the Pro's and Con's of running this on the street.

The car dosent get much street time, but I do drive it to the track and cruise sometimes.

My motor/trans combo is in my sig.

What do you guys think?
Thanks.
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Old Nov 8, 2007 | 01:17 PM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
You'd probably see more difference going to a 750 DP.

2.5" to 3" would not help at all with the 1-5/8" primaries. 1-7/8" primaries would move your powerband, but you again would not see much difference going from 2.5" to 3" with your current set-up.

I've only seen collector evac used on strip cars. I wouldn't think it would be very effective at street cruise speeds - but I can't say that for sure.
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Old Nov 9, 2007 | 07:14 AM
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bluegrassz's Avatar
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From: LONDON, KY
Car: Camaro
Engine: Carbed L98
Transmission: TH350
Axle/Gears: 3.73
Re: Switch to 3" or stay 2.5"?? EVAC system or not?

Yeah, I hope to be switching to a 750 Street HP this spring. It should wake the car up a bit.

I had considered going to the larger exhaust. I plan on going to a 383 later, but the exhaust is almost new and is not really holding me back.

I wonder how much et/mph I will pick up going from the 750vs to the 750 Street HP?
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