Author Topic: Headers and twin exhaust 67/68 289 convertible  (Read 328 times)

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Offline Woz

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Headers and twin exhaust 67/68 289 convertible
« on: December 26, 2017, 02:54:18 PM »
Hi there, looking for advice from anyone who
has fitted headers and twin system to a 67/68 289 LHD
convertible with power steering.
Thanks
Woz

Offline barnett468

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Re: Headers and twin exhaust 67/68 289 convertible
« Reply #1 on: December 26, 2017, 03:20:08 PM »
the "best" option depends upon what YOU want to achieve.

long tube headers make the best overall hp but that's irrelevant if you dot have a fire breathing engine. most long tube headers also typically hang fairly low below the car. shorties or middies are the cleanest option imo.

hedman elite headers are the best bang for the buck and are very good quality.

if you don't want it fairly loud inside the car, magnoflow mufflers are a good choice.

remflex gaskets.

Offline Brad24

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Re: Headers and twin exhaust 67/68 289 convertible
« Reply #2 on: December 26, 2017, 03:47:13 PM »
Does anyone make a try y header to suit 67/68 LHD 289?

Offline barnett468

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Re: Headers and twin exhaust 67/68 289 convertible
« Reply #3 on: December 26, 2017, 05:59:43 PM »
Does anyone make a try y header to suit 67/68 LHD 289?

lots of people do but they usually use thin 5/16" flanges that can bend when you tighten them or eventually warp from heat then leak.

Offline Woz

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Re: Headers and twin exhaust 67/68 289 convertible
« Reply #4 on: December 26, 2017, 06:57:07 PM »
Hi Brad
Donít want anything that hangs low, so yes mid or short headers,
Engine is stock except 500 edelbrock carb and manifold.
Thinking 2.5 inch, (Dont want highway drone)
Not sure cross or h pipe, I like popping on overrun.
Currently itís stock manifold with single system.
Thanks for the reply.

Offline barnett468

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Re: Headers and twin exhaust 67/68 289 convertible
« Reply #5 on: December 26, 2017, 07:03:48 PM »
Thinking 2.5 inch, (Dont want highway drone)
Not sure cross or h pipe, I like popping on overrun.
Currently itís stock manifold with single system.

1. 2.5" max but 1 7/8" - 2" is fine, but it may still drone a little.

2. h pipe

3. what "popping" are you referring to?

Offline Woz

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Re: Headers and twin exhaust 67/68 289 convertible
« Reply #6 on: December 27, 2017, 09:39:57 AM »
Current system just runs 2 pipes into 1
Down hill no acceleration causes a rough backfiring sound
I was told this happens with no h pipe.

 

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