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

New C4SP (single plane) design...

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Old Dec 15, 2005 | 10:54 PM
  #21  
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Originally Posted by mos90
aaah. i knew there had to be a reason to go threw all the extra work. i didnt realize there was an issue with the efi intakes. not that i ever doubted jeb, just wondering.

can i use the same stock style injectors with this setup?
I am using ford 24#ers no poblem.
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Old Dec 15, 2005 | 11:14 PM
  #22  
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This is not a new design. I have been making them for 15 years. It cost me $250.00 to make the plenum, rails and injectors and stansions installed with the supplied manifold.

I don't have time to make them any longer but would be happy to have a lot made for cost after the new year. The whole package should not be any more than $700.00 including the manifold or you are being ripped off.
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Old Dec 16, 2005 | 10:58 AM
  #23  
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It was what I wanted to do in the beginning but didn't because of expediency. But, Blown Vette you know everything so I'll just shut up now that you're back. If you want to make and sell them for $700.00 go for it... What I make and sell them for takes into account my time in doing so in addition to the fact that I provide all the plumbing, regulator, t-stat housing, etc with it...

That's a nice piece you've got there, BTW...
-Jeb
PS- Why do you always tape everything off? You're not a Pro Stock racer are you?? I don't get all the "secrets:" I post complete pics so people know what must be done for this thing to work under a C4 hood. If someone wants to "roll their own" I'll provide them with complete pics and even give them measurements!

Last edited by jburnett; Dec 16, 2005 at 11:02 AM.
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Old Dec 16, 2005 | 11:45 AM
  #24  
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jeb, dont worry about blown. i expect you to make money on it. time is money.

do you think there will be enough room for a 1/2" nos plate?
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Old Dec 17, 2005 | 07:04 PM
  #25  
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Originally Posted by Blown Vette
This is not a new design. I have been making them for 15 years.
I applaud both of you for your fab skills, however Traco Racing has both of you beat. They were making these intakes in the late 80’s for the GS80 Corvettes. Those were some sweet vettes that they pumped out.
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Old Dec 18, 2005 | 03:47 AM
  #26  
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Has anyone seen the Accel #74882 90* Plenum Adaptor. It looks similar to the one on the Traco motor. I can't find a price on the unit though...anyone know? I think Jburnetts might flow better, as it's bigger. I think Accel also makes a single-plane EFI manifold; but of course I don't know how far the injectors extend into the ports. I personally would like to see a RPM Air-Gap dual-plane modified for injectors.


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Old Dec 18, 2005 | 10:50 AM
  #27  
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How do you determine plenum volume?
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Old Dec 18, 2005 | 07:35 PM
  #28  
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I believe the same as CCing cylinder heads... with liquid and a burette.
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Old Dec 19, 2005 | 12:38 AM
  #29  
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Edelbrock makes a Victor, complete with bungs and fuel rails. It goes under part number 29875. You can get the complete kit as part number 29876 that includes fuel rails, cross over lines and hardware. This manifold is virtually the same as the Victor and has a larger plenum volume than the Victor Jr.

The Accel 74882 is available as is a low profile version 74883.

Last edited by tjwong; Dec 19, 2005 at 12:55 AM.
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Old Dec 19, 2005 | 12:48 AM
  #30  
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Originally Posted by Curveit
Has anyone seen the Accel #74882 90* Plenum Adaptor.
... I can't find a price on the unit though...anyone know?
It is in the Accel DFI catalog. Check pg 21 of 32.

"Jeg's lists them under p/n 310-74882 Digital Fuel Injection
(DFI) PLENUM ADAPTER" for 275.00


Originally Posted by Curveit
I think Accel also makes a single-plane EFI manifold
p/n 74139 - Chevy SB Pro Ram - single plane - manifold w/ rails

.
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Old Dec 19, 2005 | 12:51 AM
  #31  
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Incidently, the Accel 74882 doesn't appear to have
nearly the plenum volume of jburnett's, Blown's or the
Traco unit.

.
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Old Dec 19, 2005 | 12:53 AM
  #32  
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The pic of Blown Vette's look very much like an unpainted
Traco piece.

.
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Old Dec 19, 2005 | 08:26 AM
  #33  
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Originally Posted by tjwong
Edelbrock makes a Victor, complete with bungs and fuel rails. It goes under part number 29875. You can get the complete kit as part number 29876 that includes fuel rails, cross over lines and hardware. This manifold is virtually the same as the Victor and has a larger plenum volume than the Victor Jr.

The Accel 74882 is available as is a low profile version 74883.

I believe the issue with using that (as with the converted unit) is the entire coolant passage and thermostat mounting area needs to be cut down and welded, along with the coolant neck being cut, rotated, and welded back together. To gain the necessary clearance you still have to cut the coolant passage off the bottom of the TB in addition to above. Make no bones about it, the EFI Victor is a nice piece, but we still couldn't use it as is . I am glad Jeb came through and is modifying these pieces to fit under our stock hoods
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Old Dec 19, 2005 | 11:14 AM
  #34  
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Originally Posted by Curveit
Has anyone seen the Accel #74882 90* Plenum Adaptor. It looks similar to the one on the Traco motor. I can't find a price on the unit though...anyone know? I think Jburnetts might flow better, as it's bigger. I think Accel also makes a single-plane EFI manifold; but of course I don't know how far the injectors extend into the ports. I personally would like to see a RPM Air-Gap dual-plane modified for injectors.


Won't fit under a stock C4 hood on anything larger than a 2975 (Victor Jr.) manifold. The Vic Jr. is 4.58" tall whereas the Super Victor (p/n 2925) is 5.98" tall. Accel does make a single plane (p/n 74041 I believe) that is basically a Super Victor with the bungs cast in; but just as with the offered EFI manifolds from Edelbrock the front water passage must still be cut, sectioned, rewelded, and a new t-stat housing built for it. It's no more expensive for me to just do everything on it vs. buying one with the bungs already cast in.

I'm glad the pics of the TRACO piece were posted; I've never seen them. But, again, it seems no idea is truly original anymore. I've actually seen manifolds of this type made for many years as well.
-Jeb
PS- After going back and studying the pics of the TRACO piece it doesn't look fabricated but cast... That would be nice to have them cast. You'll notice they completely reworked the water passage on the manifold as well...

Last edited by jburnett; Dec 19, 2005 at 11:16 AM.
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Old Dec 19, 2005 | 11:28 AM
  #35  
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jeb. you never answered my question.

do you think a 1/2 nos plate will fit?

i hope my newer style thottle cable with work. it needs to be mounted a little bit higher that the older.
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Old Dec 19, 2005 | 11:32 AM
  #36  
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Originally Posted by Upstate
I believe the issue with using that (as with the converted unit) is the entire coolant passage and thermostat mounting area needs to be cut down and welded, along with the coolant neck being cut, rotated, and welded back together. To gain the necessary clearance you still have to cut the coolant passage off the bottom of the TB in addition to above. Make no bones about it, the EFI Victor is a nice piece, but we still couldn't use it as is . I am glad Jeb came through and is modifying these pieces to fit under our stock hoods
That's right you can't use the Victor E as is. But you can have Jeb do his magic with moving the stat housing. And save some labor without having someone or Jeb to build the rails and machine the manifold and add the injector bungs.
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Old Dec 19, 2005 | 11:58 AM
  #37  
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Originally Posted by mos90
jeb. you never answered my question.

do you think a 1/2 nos plate will fit?

i hope my newer style thottle cable with work. it needs to be mounted a little bit higher that the older.
Yeah...I tried to reply last week but for some reason I kept getting a Forum server error message. Guess it's fixed now. I "think" you can probably use a 1/2" plate on here but I don't know for sure. But...I happen to HAVE an old NOS 1/2" plate at my house (on my '77 vette). I'll bring it down to the shop and try it before I ship yours out (by the middle of this week, btw). I KNOW my NX Gemini Twin plate won't fit because I tried it; but it's 3/4" thick and just almost cleared.
-Jeb
PS- Tom, that's true! I've done that a couple of time actually!
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Old Dec 19, 2005 | 12:09 PM
  #38  
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Originally Posted by tjwong
But you can have Jeb do his magic with moving the stat housing.




My manifold from Jeb pre-dates the introduction of the E though or I probably would have went that route.
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Old Dec 19, 2005 | 08:17 PM
  #39  
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Jeb,
Where are you guys measuring from to the highest point on the TB adapter? I have measured the MRII from the top of the intake mounting flange, and come up with 5.375", while the Weiand Team G and the adapter measures 6.75".

Thanks in advance,
Aaron
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Old Dec 19, 2005 | 08:54 PM
  #40  
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i have been toying with the idea of swapping to one of those manifolds for a while now.. it would be going on a camaro so the hood clearance wouldn't be as much of a problem. i like the idea of a 4150 plate than hack a fogger in my intake bellow. i have a converted lt1 manifold on it right now and don't know if i want to stick with it or swap it in favor of one of those setups or an hsr. $700 is alot compared to an hsr. i don't really see over 7k rpms so would my engine bennifit more from one of these or an hsr or should i stick with the lt1? its a 383 with afr 203's and an 230/236 @.050 with .576/.571 on a 113lsa
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