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#1
08-28-2024, 08:43 PM
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1975 Trans Am headers
Does anyone make a 2" roundport headers for a 1975 Trans Am? Dougs offer a set from 70 to 74. Only a 7/8 for 75 up.
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#2
08-28-2024, 08:50 PM
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I wouldn't know why they wouldn't work in 75 and up?
If wanting pipes all the way back to rear it may be hard to do. But if open headers, should work? 
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#3
08-28-2024, 09:57 PM
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Hooker does, they advertise them as 70-74 due to the round port heads. I think the PN. is 4202
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#4
08-28-2024, 10:48 PM
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As Paul said Hooker 4202. Fit my 78 and the 79 Camaro with the IA motor in it. And IA block needs a little massaging esp on #1 to clear the block and freeze plug area.. May need a dimple near the rear lower A arm bracket on the frame. Some sets near the oil filter. one set i had was real bad at the oil filter.
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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 |
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#5
08-29-2024, 05:37 AM
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Why do you need 2" headers ?
To make good use of such and produce the highest average torque numbers your Exh ports would have to flow 225 cfm@ 28".
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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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#6
08-29-2024, 10:22 AM
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Quote:
I have them on a 72 Firebird with an E-head 400 block stroker, fit great overall with no problems getting a full size pontiac oil filter in/out.... only complaint is that they do hang down lower than most other headers due to the big tubes & collectors. |
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#7
08-29-2024, 03:47 PM
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Quote:
 I have Hooker 4202’s on my 70 TA with Flowmaster 4-2-1 collectors. They seem to work well and they give the car a very unique sound. I don’t think Flowmaster makes them any longer. The set on my car are 2” primary. I have a NOS set of Flownaster 4-2-1 in 2 1/8” that I bought new years in my garage. I planned on using them for a previous build and never got around to it.
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James 1970 Trans Am Spotts Built 484" IA2, Highports, EFI Northwind Holley Terminator X sequential EFI fabrication and suspension by https://www.funkhouserracecars.com/ |
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#8
08-29-2024, 07:09 PM
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http://www.wallaceracing.com/header_length.php
A tid bit. Some calculators, formulas and performance recommendations use the tube's INSIDE diameter. If that's the case you would need to subtract twice the tube's wall thickness from the outer diameter. If so that header material might be 16 gauge (.062") or 18 gauge (.049"). One example here: https://www.discountmags.com/magazin...is-issue/12912 .
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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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#9
08-30-2024, 09:56 AM
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I had GP headers copy a set of the Hookers in SS!
__________________
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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#10
08-30-2024, 05:47 PM
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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 |
| The Following User Says Thank You to Skip Fix For This Useful Post: | ||
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#11
08-31-2024, 03:29 PM
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Quote:
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James 1970 Trans Am Spotts Built 484" IA2, Highports, EFI Northwind Holley Terminator X sequential EFI fabrication and suspension by https://www.funkhouserracecars.com/ |
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#12
Yesterday, 05:51 PM
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