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SBM Air Gap mods? #1723637
01/06/15 11:49 PM
01/06/15 11:49 PM
Joined: Aug 2003
Posts: 3,226
Between a rock & a hard place
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cudadoug Offline OP
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cudadoug  Offline OP
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Joined: Aug 2003
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Between a rock & a hard place
Any of you "porter" guys have proven Air Gap mods??

If it's worth the $$, I'd gladly send you mine to do your thing to it.

PM or email me if you'd prefer. Thanks!

Re: SBM Air Gap mods? [Re: cudadoug] #1723638
01/07/15 12:00 AM
01/07/15 12:00 AM
Joined: Jun 2003
Posts: 9,225
Charleston
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sixpackgut Offline
Drag Week Mod Champion
sixpackgut  Offline
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Charleston
Not a air gap but a performer i put on my van that has like 150hp. Yours might not be this bad


Gen 3 power 6.22@110, 9.85@135
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performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
Re: SBM Air Gap mods? [Re: cudadoug] #1723639
01/07/15 12:19 AM
01/07/15 12:19 AM
Joined: Mar 2007
Posts: 3,300
Northern Indiana
Dunnuck Racing Offline
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Dunnuck Racing  Offline
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Posts: 3,300
Northern Indiana
I have seen some pretty nice gains on a BBM RPM with porting but haven't had a chance to test the small block version back to back
It looks like it could definitely use the same treatment though.
Keith

8387838-NCM_0627.JPG (153 downloads)
Re: SBM Air Gap mods? [Re: Dunnuck Racing] #1723640
01/07/15 07:49 AM
01/07/15 07:49 AM
Joined: May 2004
Posts: 12,115
Taxes & Virus's R-US, NY
Dragula Offline
I Live Here
Dragula  Offline
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Taxes & Virus's R-US, NY
I did one....Ports and cut the divider down....removed the logo, removed all the extra bosses on it...etc







'70 Cuda,...605 Hemi Street Car (6.20 best pass, 1.33 60ft)
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car)
https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car)
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)

'66 Barracuda AWB Stretched nose Blown 440 Car in build stage

'71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph
https://www.youtube.com/watch?v=Znuo3jMUXTk
Re: SBM Air Gap mods? [Re: Dragula] #1723641
01/07/15 01:18 PM
01/07/15 01:18 PM
Joined: Aug 2003
Posts: 3,226
Between a rock & a hard place
C
cudadoug Offline OP
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cudadoug  Offline OP
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Joined: Aug 2003
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Between a rock & a hard place
Quote:

I did one....Ports and cut the divider down....removed the logo, removed all the extra bosses on it...etc










Any flow bench numbers before/after to evaluate any gains??

Re: SBM Air Gap mods? [Re: cudadoug] #1723642
01/07/15 03:33 PM
01/07/15 03:33 PM
Joined: Jan 2005
Posts: 11,901
Kalispell Mt.
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HotRodDave Offline
I Live Here
HotRodDave  Offline
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Joined: Jan 2005
Posts: 11,901
Kalispell Mt.
I built a 402 SB with eddy heads, TTIs, 230@.050 hydraulic roller, and we ran a 650 double pumper, it was choking bad as the RPM climbed, started pulling vaccume and not pulling as hard as I thought it should. We had no room for a spacer and no bigger carb in the budget so I chucked a carbide in the router and milled out 3/4 inch of the divider from front to back and it would pull another 500 RPM. When we built it I did just a little radiusing in the plenum and some gasket matching... basic stuff. After eventually switching to a 750 it became a real animal pulling another 500 RPM more and now the hood and doors barely open and close (68 cuda).


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: SBM Air Gap mods? [Re: cudadoug] #1723643
01/07/15 09:55 PM
01/07/15 09:55 PM
Joined: May 2004
Posts: 12,115
Taxes & Virus's R-US, NY
Dragula Offline
I Live Here
Dragula  Offline
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Posts: 12,115
Taxes & Virus's R-US, NY
Quote:


Any flow bench numbers before/after to evaluate any gains??




No, but the entire fuel mixture cleaned right up. I was using a carb and it really liked the 1" open spacer and the cut down divider. Obviously port matching helped too, but it had a snappier rev to it, and it really liked it.

I did it in stages. I tried a 1/2" divided spacer first, then cut the divider down a bunch and used a 1" open spacer....I think it liked the added plenum the most. Then I switched to efi...


'70 Cuda,...605 Hemi Street Car (6.20 best pass, 1.33 60ft)
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car)
https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car)
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)

'66 Barracuda AWB Stretched nose Blown 440 Car in build stage

'71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph
https://www.youtube.com/watch?v=Znuo3jMUXTk
Re: SBM Air Gap mods? [Re: Dragula] #1723644
01/07/15 10:20 PM
01/07/15 10:20 PM
Joined: Jun 2003
Posts: 52,970
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
Master

Joined: Jun 2003
Posts: 52,970
Romeo MI
I was just reading today in one of the Mopar mags
that they are building a 416 with that intake and
it showed a few pics and its mods.. not sure about
flow numbers..this was part 2 of the artical....
sorry I dont recall which mag... but its on sale now

Re: SBM Air Gap mods? [Re: MR_P_BODY] #1723645
01/07/15 11:54 PM
01/07/15 11:54 PM
Joined: Jan 2003
Posts: 9,826
las vegas
70AARcuda Offline
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Posts: 9,826
las vegas
Quote:

I was just reading today in one of the Mopar mags
that they are building a 416 with that intake and
it showed a few pics and its mods.. not sure about
flow numbers..this was part 2 of the artical....
sorry I dont recall which mag... but its on sale now





Mopar Muscle


Tony

70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
Re: SBM Air Gap mods? [Re: 70AARcuda] #1723646
01/08/15 01:55 PM
01/08/15 01:55 PM
Joined: Aug 2003
Posts: 3,226
Between a rock & a hard place
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cudadoug Offline OP
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cudadoug  Offline OP
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Thanks all! I'll hunt down the MM mag.

The gasket match is a no brainer as the intake is a little conservative compared to my gaskets, and I ASSUMED the added plenum would be a plus. I just thought I'd survey the brain trust and see what is out there and if someone already had "porting" program established, I'd contribute to their revenue.

Re: SBM Air Gap mods? [Re: cudadoug] #1723647
01/08/15 04:08 PM
01/08/15 04:08 PM
Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
RobX4406 Offline
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Overpriced Housing Central
I'd port match, smooth radius the entry at carb and run it.

Re: SBM Air Gap mods? [Re: cudadoug] #1723648
01/08/15 09:30 PM
01/08/15 09:30 PM
Joined: Jan 2013
Posts: 34
MD
1965fish Offline
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1965fish  Offline
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MD
Sorry to hijack the thread but what kind of valve covers are these?


1965 Plymouth Barracuda Formula S
1965 Plymouth Valiant 200 Station wagon 408 6.57 @ 104
2001 Dodge Dakota 394 6.64 @ 103 1/8 mile 10.64 @ 123 1/4 mile
1965 Plymouth Valiant Signet 2DR HT
Re: SBM Air Gap mods? [Re: RobX4406] #1723649
01/08/15 09:47 PM
01/08/15 09:47 PM
Joined: Aug 2003
Posts: 3,226
Between a rock & a hard place
C
cudadoug Offline OP
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cudadoug  Offline OP
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Joined: Aug 2003
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Between a rock & a hard place
Quote:

I'd port match, smooth radius the entry at carb and run it.




That's the plan now. I'll also cut down and narrow the divider as that seems to be SOP on these intakes I've learned.

Re: SBM Air Gap mods? [Re: cudadoug] #1723650
01/08/15 10:03 PM
01/08/15 10:03 PM
Joined: Feb 2005
Posts: 19,645
PA.
pittsburghracer Offline
"Little"John
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"Little"John

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Posts: 19,645
PA.
I know it's a different intake but I did a fair amount of flowbench and porting on an ld340 intake and divider work paid little dividends Intake flange and radius attention was where the payoff was. The runners needed work but with the design of these intakes that was impossible. If you want to flow over 270-275 cam step up to a different manifold

Last edited by pittsburghracer; 01/08/15 10:14 PM.

1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

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