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428PI in '68 Shelby. What size H-pipe?

September 5 2013 at 12:14 PM
  (Login PP68GT500)
Members

I'm giving up trying to run my Hooker Super Comps with the stock heads due to leaks and bolt pattern issues. I'm going back to the stock exhaust manifolds as much as I hate to. What size h-pipes, 2" or 2 1/4" were stock? Any fitment issues and should I go with or without the spacer? Opinions please.

'68 Shelby GT500 428PI/C6
'68 Mustang FB J code 302/4spd
'68 Ford PU shortbed 240/3 on tree
'90 Mustang 7up Conv 302/auto
'62 Willys CJ-5 289/T-98 4 spd
'56 Chevy 210 post 454/TH400(I know,sorry)
'89 Dodge Shelby Dakota (again, sorry)

 
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AuthorReply

(Login sportyworty)
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2.00 check this out

September 5 2013, 12:22 PM 

Scott offers an exact reproduction. Ford licensed and Concours approved by SAAC and MCA. Perfect fit every time.

http://www.scottfullerreproductions.com/catalog/item/4595229/7665865.htm

 
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(Login PP68GT500)
Members

That sure is purty but...

September 5 2013, 12:39 PM 

I refuse to run that stock transverse muffler so the rest of the exhaust will be custom. I know I'm supposed to be rich to own a Shelby but I'm still waiting on my ship to come in! I'll be going with NPD's for 1/5 the price since I'm not going the concourse route and I intend to drive it.

'68 Shelby GT500 428PI/C6
'68 Mustang FB J code 302/4spd
'68 Ford PU shortbed 240/3 on tree
'90 Mustang 7up Conv 302/auto
'62 Willys CJ-5 289/T-98 4 spd
'56 Chevy 210 post 454/TH400(I know,sorry)
'89 Dodge Shelby Dakota (again, sorry)

 
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(Login TorinoBP88)
Members

Walker makes a high flow transverse muffler that works like a turbo muffler

September 5 2013, 2:11 PM 

and flows about like dual turbo mufflers, if you MUST have it stock looking.

********************************************
1964 Galaxie 4Dr Sedan, 289, 3spd 303 (originally w/ Overdrive)
1966 F100 Flare Side Putt-Putt, 240 straight 6, C4 Auto
1967 416 "390 GT", BI/BO Wide R TL
1968 428, CJ heads, Galaxie Wide R TL

A Bicycle or two as my daily driver - real gas saver.

 
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(Login PP68GT500)
Members

Stock look not necessary but thx for the tip n/m

September 5 2013, 2:20 PM 



'68 Shelby GT500 428PI/C6
'68 Mustang FB J code 302/4spd
'68 Ford PU shortbed 240/3 on tree
'90 Mustang 7up Conv 302/auto
'62 Willys CJ-5 289/T-98 4 spd
'56 Chevy 210 post 454/TH400(I know,sorry)
'89 Dodge Shelby Dakota (again, sorry)

 
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(Login DEames)
Members

I agree. Dump the "suitcase" muffler

September 5 2013, 3:29 PM 

and I'd use 2 1/4 minimum pipe with a crossover ala' OE and good 'ole Cherry Bombs. They're not the latest rage but they sound good and won't drone you to death!
Eames.

 
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(Login BrianJaspercoia)
Members

What about FPA's?

September 5 2013, 1:31 PM 

Only thing I've heard bad on them, besides being a bit pricey, is they don't flow quite as good as the Hooker's do. Still breathe better than manifolds would...

 
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(Login PP68GT500)
Members

I'll save my money for aluminum heads some day

September 5 2013, 2:23 PM 

since I already have 2 sets of Hookers.

'68 Shelby GT500 428PI/C6
'68 Mustang FB J code 302/4spd
'68 Ford PU shortbed 240/3 on tree
'90 Mustang 7up Conv 302/auto
'62 Willys CJ-5 289/T-98 4 spd
'56 Chevy 210 post 454/TH400(I know,sorry)
'89 Dodge Shelby Dakota (again, sorry)

 
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Royce
(Login RoyceP)
Members

Branda system

September 5 2013, 4:54 PM 

Friend of mine just bought the complete Branda exhaust system and installed stock GT manifolds on his '68 GT500. It didn't change performance significantly from the previous Hooker Super Comp / 2 1/4" system but it is much quieter with the transverse muffler.

It sounds awesome. It sounds like a brand new GT500 did in 1968. It's a good thing.


[linked image]
1912 Model T Ford touring Salmon (ugh!)
1917 Model T Ford Torpedo runabout green
1915 Model T Ford touring Black of course!
1968 Cougar W code 427 GT-E Madras Blue / Turquoise interior
1968 Cougar GTE 427 Augusta Green / Saddle
http://www.supermotors.net/vehicles/registry/15029/50071-2

 
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(Login PP68GT500)
Members

Thanks Royce. Did he use the spacer?

September 5 2013, 5:12 PM 

I'm trying to decide which H-pipe to buy with or without. What would you do?

'68 Shelby GT500 428PI/C6
'68 Mustang FB J code 302/4spd
'68 Ford PU shortbed 240/3 on tree
'90 Mustang 7up Conv 302/auto
'62 Willys CJ-5 289/T-98 4 spd
'56 Chevy 210 post 454/TH400(I know,sorry)
'89 Dodge Shelby Dakota (again, sorry)

 
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Royce
(Login RoyceP)
Members

Depends

September 6 2013, 4:04 PM 

Do I want the Shelby like I would have modified it in high school knowing full well that every penny I spend on modifications is a loss in value? Or do I want it modified in invisible ways that enhance performance while maintaining value?

Frankly I like making invisible mods to protect the value. If you want more performance install a roller cam, port the C8AE-H heads, extrude hone the manifolds. Add a 4.25" crank.

We used the original type manifolds and spacer without a heat riser, which is actually a February 68 thing. The car was built in November 67, so it originally had a spacer with a heat riser valve.

[linked image]
1912 Model T Ford touring Salmon (ugh!)
1917 Model T Ford Torpedo runabout green
1915 Model T Ford touring Black of course!
1968 Cougar W code 427 GT-E Madras Blue / Turquoise interior
1968 Cougar GTE 427 Augusta Green / Saddle
http://www.supermotors.net/vehicles/registry/15029/50071-2

 
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Blair Patrick
(Login CaptCobrajet)
Members

Original H-Pipe was..................

September 5 2013, 8:34 PM 

2-1/8" tube. My brother and I have an original KR with 26000 miles on it, and the pipes are not 2" and they are not 2-1/4. I'm sure the concourse judged stuff has some accepted replacements, but originally the pipes were 2-1/8. Back in the 80's my dad wanted to replace the exhaust but could not find anyone who had dies to bend that size, so he did nothing..........now it really needs some pipes. I'm curious as to what is an accepted replacement these days.

Blair Patrick

 
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(Login sportyworty)
Members

Blair PI and CJ/KR are different

September 6 2013, 6:46 AM 

A pre KR GT500 has a 2.00 same as 390 GT. Scott makes his exhaust from original Ford supplied Blue Prints. If you navigate his site the 2.25 KR/CJ system is there as well. You are absolutely correct that portions of the KR/CJ system measure at 2.125. These areas include any bend or approach to a bend as the system was press bent with a shoe and dye unlike todays mandrel. The over axle area is reduced from the original 2.25 to 2.125 as well as the area just before it goes into the muffler. The circumference measurement just before it goes into the resonator remains at the original 2.25" The system is a true 2.25 original spec at the start.

 
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68GT500
(Login 68gt500)
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The Hooker Super Comps fit perfectly on my 68GT500...

September 5 2013, 10:40 PM 

I have run the same headers with the original heads and since 2001 with the Edelbroks.

No problem, except for the real tight fit.

Make sure the shock towers are not collapsed inward - many are.

The rest of my Exhaust is an off the shelf 3" Magnaflow - pretty hard to beat - performance, sound and fit.

Never would go back to a standard exhaust - ever.



Mike (Germany)
68 GT500

 
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(Login vtdon)
Members

2X

September 6 2013, 2:44 AM 

Only difference is 2-1/2" MagnaFlow. Just wish left side header didn't hang so low. Use a Monte Carlo bar to space shock towers.

 
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(Login qikbbstang)
Members

Couldn't the stock cast iron 390GT/Shelby428 be upgraded to 428CJ cast iron manifolds?

September 6 2013, 1:32 PM 

Got to be a worthwhile kick in the seat of the pants on even a moderate motor and of course the CJs run a larger H pipe etc (I think). I know they make repop CJ ex-manifolds but don't know how they compare in quality/price to OEMs

bb

 
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(Login PP68GT500)
Members

Thx for all the input guys

September 8 2013, 4:30 AM 

I picked up my H-pipe from NPD on Saturday and I'll be installing with the spacer.

'68 Shelby GT500 428PI/C6
'68 Mustang FB J code 302/4spd
'68 Ford PU shortbed 240/3 on tree
'90 Mustang 7up Conv 302/auto
'62 Willys CJ-5 289/T-98 4 spd
'56 Chevy 210 post 454/TH400(I know,sorry)
'89 Dodge Shelby Dakota (again, sorry)

 
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