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#1
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intake porting
Anyone out there porting intakes? I emailed SD performance with no reply. I have a 1970 Iron intake, and an edelbrock performer I was given I'd like to have done for modest 400 builds. 400 HP or so with quadrajets.
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#2
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SD Performance had a landslide wreak havoc at their home,/shop. It put them in a bind. When they got going again, they were behind schedule.
They have been working on their work on hand, not taking any new work. I'd try to contact Dave again. His work is the best I doubt there's anyone c else that can CNC port a Pontiac intake. Others, from time to time have had difficulty getting ahold of Dave. Their business has been challenged a couple of times now with mudslides. If Dave and Lisa would just move to Oklahoma, we'd all benefit!!!
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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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#3
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Jim Robertson does very nice intake and head porting. He’s on the board from time to time.
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James 1970 Trans Am Spotts Built 484" IA2, Highports, EFI Northwind Terminator X sequential EFI fabrication and suspension by https://www.funkhouserracecars.com/ |
#4
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I know SD isn't doing iron heads anymore and not sure about manifolds? Like 77TRASHCAN said the slide really messed things up and clean up was extensive. No way they are moving to Oklahoma, Canada is their home. Where are you located TA63?
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DragStarLeMans |
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#5
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Drag Star,
Just kidding on Dave and Lisa, moving anywhere. I've read that Dave will still work on iron intakes. I got on their website. Looks like the site is somewhat scaled back, still says they are playing catch up... I hope all is well with them. Seems like a couple of folks here, are close to them???
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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... |
The Following User Says Thank You to 77 TRASHCAN For This Useful Post: | ||
#6
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Both Intake Manifolds are capable of producing over 400 hp in stock form.
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I do stuff for reasons. |
#7
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Just for the record, if all you're looking for is 400 HP they'll do that easily without porting them.
Many of us have topped 500hp with them with very little if any work to the intake. |
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#8
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I was one of those that had a difficult time reaching Dave. This was long before any mud slide. Back around the time he was planning to move to Canada. He lived in California before that. He did eventually reach out to me but by then I had already persued another avenue.
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#9
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Wish someone would share the recipe for improving the RUNNERS with least work for most gain.
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#10
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Quote:
To be honest, even what is considered the fully ported OEM intakes don't get all 8 runners the full length either. It's about impossible to do that unless you either start cutting the intake apart, or send it off to be extrude honed. |
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#11
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Where the real Choke points are in the runners of a duel plane Intake can not be accessed unless you can weld the Intake back up after you cut it open.
Just keep this in mind when looking at your Intake . A basically straight section of runner flows very efficiently, once you put even just a 45 degree bend into the runner ( as in when a Plenum joins the runners ) your going to drop 20% your flow capabilities or more!
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I do stuff for reasons. |
#12
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Steve, Is that why they put waffling or turtles in the bottom of the intake so it's not a flat 90 degrees turn for the mixture?
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Jim Moshier 1971 Grand Prix 462ci SD Performance 6x heads 1962 Catalina 389 1968 Firebird 400-455 I haven't decided "If we ever forget that we're one nation under GOD, then we will be a nation gone under." - Ronald Reagan |
#13
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Poor man's extrude Hone process...
Use muriatic acid to etch out the inside of aluminum intake manifolds. to increase the runner volume slightly. A sheet of stainless steel can be used to cover the port openings in order to retain the liquid. Keep in mind this is a harsh and toxic chemical, extreme caution is advised. Don't breath that stuff ! It's not a fast process and you will need to change batches as it works. .
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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 |
#14
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The waffling at the bottom of the plenum has something to do with cooling the aluminum during the casting process.
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#15
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" Notice the “waffle” pattern at the bottom of each plenum – this is an intentional feature that helps keep the fuel and air consistently mixed on their way to the cylinders."
https://stateofspeed.com/2018/11/10/...take-manifold/ ".... and see a "waffle" pattern in the bottom of the plenum, don't smooth it too much..." How to Port & Polish an Intake Manifold https://itstillruns.com/port-polish-...d-5568931.html .
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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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#16
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I asked about the waffle to a head porter, manifold guy in Michigan who has a intake of mine. He makes the best manifolds there is in many folks opinion. Ported some of the best Pontiac heads ever to have been done.
So I ask him if it would be any benefit to removing the waffle in my Victor going on my 461. I was told it is simply there for cooling in the manufacturing process. Was told not worth it for me. He is the expert so I will go with what he said. Also asked about turtles and was told they help in some situations. I always thought the cast waffles were there for performance reasons too. But the best Victor I have ever seen did not have the waffle. Victors are very thick on the plenum floor, heavy intakes. |
#17
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Complete waste of time funds to mess with the Performer intake. The runners are really small and not much to work with.
When I "modify" the factory intakes the focus is on opening it up under the carb, not messing much with the runners. The runners simply get the best port match to a stock Felpro intake gasket that I can, and smoothed/blended some, and any casting flash removed, etc. The plenum areas under the carb are opened up to pretty much the same size/shape as the RPM intake. I also add some material on some to give it both bolt patterns in case the owner wants to run a square flange carb w/o an adapter...
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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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#18
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If you have a performer already to run on your 400 cid motor or smaller, then as long as your heads are no more then lightly bowl ported and you don’t mind a big HP nose over starting at 5200 rpm, then there is nothing to fear about running that intake.
It certainly has its place in 3500 lb or more cars with less then 3.08 series rear gears if you do not have a factory intake and or want to shed a few pounds on the nose of the car.
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I do stuff for reasons. Last edited by 25stevem; 10-08-2022 at 07:33 AM. |
#19
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If you use a Performer the center divider can sometimes rub on the secondary blades.
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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 |
#20
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Jim Hand reported only the Edelbrock Performer intake ran as well as the stock cast iron unit on his car, as we know it was a well tuned stock type 455 in a 3900# vehicle. At the time of the testing it ran in the range of 12.5 to 12.75 at 107 to 109 MPH. Setup to need the high torque/power from about 1400 to 5200 RPM.
And in a 1997 issue of Pontiac Enthusiast magazine Pete McCarthy reported even the lowly Edelbrock "Performer" produced good low-end torque with stock D-port heads. Ummmmmmmm.... Imagine the modifications that one could perform with a proper port-match on the cylinder heads in use and some porting of the intake runners. At least blending the taper to an inch or two in. Smooth and clean up the central plenum chamber if you'd like, often there's room for enlargement or improvement. .
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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 Last edited by Steve C.; 10-08-2022 at 10:12 AM. |
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