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Old

Sep 13, 2016 | 09:53 PM

#1

Thread Starter

Junior Member

Joined: Jul 2016

Posts: 19

Likes: 0

From: columbia tn

Car: 91 GTA

Engine: 350

Transmission: 4 speed auto

Axle/Gears: 3.23 posi

no longer need

thanks for the info

Last edited by nzwcpn; Sep 11, 2017 at 04:49 PM.

Old

Sep 14, 2016 | 05:48 AM

#2

Supreme Member

iTrader: (9)

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Posts: 12,223

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From: Il

Car: 1989-92 FORMULA350 305 92 Hawkclone

Engine: 4++,350 & 305 CIs

Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5

Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt

Re: tri-y header clarification for 91 GTA

I have only seen 1 92 firehawk with 1 3/4 tri Y headers (jet hot coated except the air tubes) so I know they were made but since no real records exist on what went where and when, it would be pure speculation.

Old

Sep 14, 2016 | 03:59 PM

#3

Member

iTrader: (2)

Joined: Jun 2005

Posts: 334

Likes: 76

Car: 91 Formula

Engine: 5.0 tpi slow

Transmission: WC t-5

Re: tri-y header clarification for 91 GTA

These are 2 different sets I have.

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Old

Sep 14, 2016 | 04:01 PM

#4

Member

iTrader: (2)

Joined: Jun 2005

Posts: 334

Likes: 76

Car: 91 Formula

Engine: 5.0 tpi slow

Transmission: WC t-5

Re: tri-y header clarification for 91 GTA

Both sets. Obviously different. I'll measure the other primary's tonight

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Old

Sep 14, 2016 | 05:11 PM

#5

Supreme Member

iTrader: (9)

Joined: Oct 2001

Posts: 12,223

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From: Il

Car: 1989-92 FORMULA350 305 92 Hawkclone

Engine: 4++,350 & 305 CIs

Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5

Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt

Re: tri-y header clarification for 91 GTA

Put some dial calipers on the od of the outside of the header strait section.'

Old

Sep 14, 2016 | 08:19 PM

#6

Member

iTrader: (2)

Joined: Jun 2005

Posts: 334

Likes: 76

Car: 91 Formula

Engine: 5.0 tpi slow

Transmission: WC t-5

Re: tri-y header clarification for 91 GTA

1.822. Sorry can only attach 1 pic at a time

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Old

Sep 14, 2016 | 08:21 PM

#7

Member

iTrader: (2)

Joined: Jun 2005

Posts: 334

Likes: 76

Car: 91 Formula

Engine: 5.0 tpi slow

Transmission: WC t-5

Re: tri-y header clarification for 91 GTA

Inside 1.724

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Old

Sep 14, 2016 | 08:23 PM

#8

Member

iTrader: (2)

Joined: Jun 2005

Posts: 334

Likes: 76

Car: 91 Formula

Engine: 5.0 tpi slow

Transmission: WC t-5

Re: tri-y header clarification for 91 GTA

Other style outside 1.613

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Old

Sep 14, 2016 | 08:24 PM

#9

Member

iTrader: (2)

Joined: Jun 2005

Posts: 334

Likes: 76

Car: 91 Formula

Engine: 5.0 tpi slow

Transmission: WC t-5

Re: tri-y header clarification for 91 GTA

And inside 1.435

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Old

Sep 14, 2016 | 08:25 PM

#10

Member

iTrader: (2)

Joined: Jun 2005

Posts: 334

Likes: 76

Car: 91 Formula

Engine: 5.0 tpi slow

Transmission: WC t-5

Re: tri-y header clarification for 91 GTA

Side by side

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Old

Sep 14, 2016 | 08:26 PM

#11

Member

iTrader: (2)

Joined: Jun 2005

Posts: 334

Likes: 76

Car: 91 Formula

Engine: 5.0 tpi slow

Transmission: WC t-5

Re: tri-y header clarification for 91 GTA

Y pipes

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Old

Sep 14, 2016 | 08:27 PM

#12

Member

iTrader: (2)

Joined: Jun 2005

Posts: 334

Likes: 76

Car: 91 Formula

Engine: 5.0 tpi slow

Transmission: WC t-5

Re: tri-y header clarification for 91 GTA

Other

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Old

Sep 14, 2016 | 09:20 PM

#13

Supreme Member

iTrader: (9)

Joined: Oct 2001

Posts: 12,223

Likes: 1,148

From: Il

Car: 1989-92 FORMULA350 305 92 Hawkclone

Engine: 4++,350 & 305 CIs

Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5

Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt

Re: tri-y header clarification for 91 GTA

Quote:

Originally Posted by 2slow5.0

1.822. Sorry can only attach 1 pic at a time

Which pipe is this???

Old

Sep 14, 2016 | 09:31 PM

#14

Thread Starter

Junior Member

Joined: Jul 2016

Posts: 19

Likes: 0

From: columbia tn

Car: 91 GTA

Engine: 350

Transmission: 4 speed auto

Axle/Gears: 3.23 posi

*

Last edited by nzwcpn; Apr 26, 2017 at 07:50 PM.

Old

Sep 14, 2016 | 10:15 PM

#15

Member

iTrader: (2)

Joined: Jun 2005

Posts: 334

Likes: 76

Car: 91 Formula

Engine: 5.0 tpi slow

Transmission: WC t-5

Re: tri-y header clarification for 91 GTA

Quote:

Originally Posted by TTOP350

Which pipe is this???

Cylinder 1 primary

Old

Sep 15, 2016 | 06:22 AM

#16

Supreme Member

iTrader: (9)

Joined: Oct 2001

Posts: 12,223

Likes: 1,148

From: Il

Car: 1989-92 FORMULA350 305 92 Hawkclone

Engine: 4++,350 & 305 CIs

Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5

Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt

Re: tri-y header clarification for 91 GTA

Quote:

Originally Posted by nzwcpn

I wonder if both sizes of the SLP headers was available with air fittings or if only one size was made that way ?

Yes, they were both originally available with air tubes.

Old

Sep 17, 2016 | 02:43 PM

#17

Thread Starter

Junior Member

Joined: Jul 2016

Posts: 19

Likes: 0

From: columbia tn

Car: 91 GTA

Engine: 350

Transmission: 4 speed auto

Axle/Gears: 3.23 posi

*

Last edited by nzwcpn; Apr 26, 2017 at 07:51 PM.

Old

Sep 18, 2016 | 02:19 AM

#18

Supreme Member

iTrader: (4)

Joined: Sep 2010

Posts: 1,626

Likes: 46

From: Double Bratville

Car: '89 Formula

Engine: LS2

Transmission: 4L65E

Axle/Gears: MW 3.42 12 Bolt

Re: tri-y header clarification for 91 GTA

1 3/4" SLP Tri-Y w/ dual cats.

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Old

Sep 18, 2016 | 06:47 AM

#19

Supreme Member

iTrader: (9)

Joined: Oct 2001

Posts: 12,223

Likes: 1,148

From: Il

Car: 1989-92 FORMULA350 305 92 Hawkclone

Engine: 4++,350 & 305 CIs

Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5

Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt

Re: tri-y header clarification for 91 GTA

Ted, those are SLP 4n2-1 headers.

Old

Sep 20, 2016 | 02:31 PM

#20

Supreme Member

iTrader: (4)

Joined: Sep 2010

Posts: 1,626

Likes: 46

From: Double Bratville

Car: '89 Formula

Engine: LS2

Transmission: 4L65E

Axle/Gears: MW 3.42 12 Bolt

Re: tri-y header clarification for 91 GTA

Quote:

Originally Posted by TTOP350

Ted, those are SLP 4n2-1 headers.

Oops, I had an insomnia moment

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