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#1
10-02-2017, 08:22 PM
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`77 Pontiac stock intake or Edelbrock Pontiac Performer?
This is going on my 400 with 6x-4s.
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79 Firebird/`70 400 with `77 6x-4s shaved .065"/4 speed BW ST-10/Cliff Q-Jet/XE268/3.08 99 Trans Am/383 LS1/TSP headers and catback/custom grind cam/Vigilante 2500/Strano springs and Konis 08 Corvette - Base (SOLD) 75 Corvette/L48 350 (LSx -4L60E one day) -------------------------------------------------------------- |
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#2
10-02-2017, 08:48 PM
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I would rather use the Performer for weight reduction and easier install/removal. Grind off the lettering and paint for a stealth-ish look if desired.
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"...ridge reamer and ring compressor? Do they have tools like that?" |
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#3
10-03-2017, 06:10 AM
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The EGR on the stock Intake makes for a restriction in the Plenum and it's added mass so close to that side of the Carb just dumps more heat into it so go for the Performer.
Also the secondary Carb pad on those year Intakes may already be restricted, I forget?
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#4
10-03-2017, 06:47 AM
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Agree. Considerable weight advantage with the Performer. They stain easily though, so I would definitely paint.
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1978 Y88 Trans Am 4-Speed 47k original mile Survivor |
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#5
10-03-2017, 07:24 AM
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The stock intake has better runners than the performer and also fits better for the shaker.
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Conrad 79 Trans AM 406 #12 heads Torker II intake Crower 60210 750 holley vac. sec. T400 3500 Stall 3:73:1 rear.  ECMTTFMFers. IHTTFMFers.
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#6
10-03-2017, 08:28 AM
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I'd use the stock intake, no advantage other than a few pounds to use a Performer in that application......FWIW
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
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#7
10-03-2017, 08:34 AM
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Unless your running ported iron heads and looking to top 425 hp the Performer works just just fine up to 5400 rpm before the hp will nose over, even with 455 cid under it!
On my 77 TA with the Performer I had zero changes to make , the shaker was a drop in! However opening it up with some richer jetting felt like the motor gained 12 to 15 hp above 4500 rpm even with stock 6X heads thru the Exh Manifolds!
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#8
10-03-2017, 08:38 AM
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You only need to attend a sanctioned NHRA event and watch a couple of Stock Eliminator cars make a pass or two with one of those later EGR intakes to know that they are PLENTY for one of the later model "low" compression engines with 6X heads on them......Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
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#9
10-03-2017, 09:27 AM
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Can NHRA Stock Eliminator cars modify the inside of their intake manifolds ?
I know you can in the F.A.S.T. Racing group. One fine example is Jay DeLaigle's 1974 Trans Am with the 501 cid engine often touted as using the '74 EGR cast iron intake. However, and important to note, is the fact that his intake was ported and flowed by Wilson Manifolds with support from Jon Kasse Racing and SD Performance. Big time work and expensive. .
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
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#10
10-03-2017, 09:43 AM
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Don't remember where, but there's been testing on the later EGR intakes, they lose NOTHING compared to the 68-72 stock iron intakes. This kniowledge may not be well known.
I emailed Dave at SD Perf years ago, asking about the EGR intake, he had no negative comments....... Seems like Pontiac engineers were on the ball, AGAIN!!!
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1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... 
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#11
10-03-2017, 10:11 AM
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The D shape to the secondary holes reduces reversion into the carburetor. the cast iton intake has larger runners than the Performer.
The SD intake has larger runners than the stock cast iron intake. |
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#12
10-03-2017, 11:30 AM
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From the 'fact or fiction file'.......
"Even the lowly Edelbrock Performer consistently provides more low-end torque with stock D-port heads than any of the factory 4-bbl manifolds" Pete McCarthy Pontiac Enthusiast Magazine article, 1997 .
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
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#13
10-03-2017, 11:49 AM
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What level of reversion could we be talking about in a duel plane?
I would tend to agree with that as when I installed one on my 2.73 geared TA I saw no loss of bottom end , more mid power and when I installed new plugs the coloring was more even across all 8.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#14
10-03-2017, 12:53 PM
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Stockers are not supposed to touch intake or heads but many fudge acid wash then steel shot blast for the cast look.
And yes the 78 Firebirds often run in the 11s with the factory EGR intake.
__________________
Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
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#15
10-03-2017, 02:50 PM
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The plenum is deeper on the later EGR stock intakes. I measured it myself. There was an in depth article on the intakes online also. I can't find it, but I do have a 1970 and 1976 intake sitting out in the shop. The performer has smaller runner dimensions...as I recall reading. SO it should have higher velocity, and more low end..... at the expense of top end to the stock units.
I'd use the stock one. I'll look further for that article, later when I have time. |
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#16
10-03-2017, 05:39 PM
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#17
10-03-2017, 07:31 PM
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Great read!!!
__________________
1978 Y88 Trans Am 4-Speed 47k original mile Survivor |
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#18
10-03-2017, 08:33 PM
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Good stuff ... I think that I'm gonna slap the iron back on it. I had been using the Edelbrock .. but it has a stripped carb hole and will need to be helicoiled. I just hope that I can mount it. When I had the heads shaved, the intake side was supposed to have been done. The Edelbrock was a little tight on a few of the bolt holes and I had to elongate them.
__________________
79 Firebird/`70 400 with `77 6x-4s shaved .065"/4 speed BW ST-10/Cliff Q-Jet/XE268/3.08 99 Trans Am/383 LS1/TSP headers and catback/custom grind cam/Vigilante 2500/Strano springs and Konis 08 Corvette - Base (SOLD) 75 Corvette/L48 350 (LSx -4L60E one day) -------------------------------------------------------------- |
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#19
10-04-2017, 01:57 AM
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So quick measure of the plenum depth, its deeper on the passenger side, where the bump is for the EGR valve, about the same on the other side. If you don't have the tin plate that goes under the carb I would get one or open up the openings. Seems it would make for quite an air disturbance there without it
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#20
10-04-2017, 01:33 PM
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Yes ... I've got the plate.
  Sent from my SAMSUNG-SM-G360AZ using Tapatalk
__________________
79 Firebird/`70 400 with `77 6x-4s shaved .065"/4 speed BW ST-10/Cliff Q-Jet/XE268/3.08 99 Trans Am/383 LS1/TSP headers and catback/custom grind cam/Vigilante 2500/Strano springs and Konis 08 Corvette - Base (SOLD) 75 Corvette/L48 350 (LSx -4L60E one day) -------------------------------------------------------------- |
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