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notching plenum divider on sb air gap...
#266986
03/26/09 03:00 AM
03/26/09 03:00 AM
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Joined: Jul 2006
Posts: 383
Essex, Ont., Canada
Fishmarket
OP
enthusiast
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OP
enthusiast
Joined: Jul 2006
Posts: 383
Essex, Ont., Canada
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Does anyone have any dyno data on notching the plenum divider on a sb air gap? Or perhaps used an open spacer and saw a gain? The chevy units come with the notch. Just got me thinking, but its probably Not there for a reason.
1972 Plymouth Cuda 340 4 speed
1971 Plymouth Road Runner 383 Auto
1970 Plymouth Duster /6 Auto
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Re: notching plenum divider on sb air gap...
[Re: Fishmarket]
#266987
03/26/09 07:31 AM
03/26/09 07:31 AM
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Joined: Nov 2006
Posts: 1,086
Baton Rouge, La.
StandOnIt
super stock
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super stock
Joined: Nov 2006
Posts: 1,086
Baton Rouge, La.
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I put a 1" supersucker spacer on mine and saw a little. Was last year so I dont remember exactly what it was. No dyno tho, real world at the track. It's stil on there so it was a gain in et.
76' Volare, 5.9 magnum w/Iron heads. New best 10.68 at 123 mph 1/4 mile.
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Re: notching plenum divider on sb air gap...
[Re: Fishmarket]
#266989
03/26/09 10:04 AM
03/26/09 10:04 AM
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Joined: May 2004
Posts: 12,478
Taxes & Virus's R-US, NY
Dragula
I Live Here
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I Live Here
Joined: May 2004
Posts: 12,478
Taxes & Virus's R-US, NY
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I have modded mine on my 360 that way and added a 1" open spacer. I thinned it out, dropped it down, and profiled it as smooth as possible. Combined with the 1" spacer, it helped a lot with throttle response and a rich condition I had at idle. Without the spacer, there was little difference. Sorry, no dyno numbers, but seat of the pants feel said, much better... 
Last edited by Dragula; 03/26/09 10:07 AM.
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Re: notching plenum divider on sb air gap...
[Re: Dragula]
#266990
03/26/09 11:21 AM
03/26/09 11:21 AM
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Joined: Jul 2006
Posts: 383
Essex, Ont., Canada
Fishmarket
OP
enthusiast
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OP
enthusiast
Joined: Jul 2006
Posts: 383
Essex, Ont., Canada
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My engine is 418 CI and I rev to 6500.
1972 Plymouth Cuda 340 4 speed
1971 Plymouth Road Runner 383 Auto
1970 Plymouth Duster /6 Auto
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Re: notching plenum divider on sb air gap...
[Re: Fishmarket]
#266991
03/26/09 11:31 AM
03/26/09 11:31 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
My engine is 418 CI and I rev to 6500.
I wouldnt cut the wall, but I would add a 1" - 2"
open spacer for the added plenum volume you need
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Re: notching plenum divider on sb air gap...
[Re: MR_P_BODY]
#266992
03/27/09 10:54 AM
03/27/09 10:54 AM
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Joined: May 2004
Posts: 12,478
Taxes & Virus's R-US, NY
Dragula
I Live Here
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I Live Here
Joined: May 2004
Posts: 12,478
Taxes & Virus's R-US, NY
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Quote:
Quote:
My engine is 418 CI and I rev to 6500.
I wouldnt cut the wall, but I would add a 1" - 2"
open spacer for the added plenum volume you need
Mine was thinned and ground lower to blend with the radius's at the top and bottom. Its probably .250 lower in the center, and way thinner. The open spacer really makes the difference though.
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