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Re: Anyone Running Stahl 2 1/8" headers on a BB A-Body?
[Re: GTSDave]
#550134
12/11/09 10:13 AM
12/11/09 10:13 AM
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Joined: Jan 2003
Posts: 16,928
NC
440Jim
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I Live Here
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Quote:
This is a 496" low deck with SR heads ( I have some CNC325's to put on later)
I found this old post info that was so amazing, I saved it. Every application can be different, but it seems close enough to consider. I would bet the ProParts would beat the Hooker fenderwells (long), but not the step header.
Quote:
Fast68plymouth dyno test, 493 CID
Includes Hooker Super Comp A-body fenderwells (2" x 43")
versus his dyno headers, stepped 2 to 2-1/8", 32" long (12" + 20")
test A-M1 4150/905 carb/1" open spacer/dyno headers
test B-M1 4150/1050 carb/2" adapter/dyno headers
test C-M1 4500/1050 carb/no spacer/dyno headers
test D-M1 4500/1050 carb/no spacer/ A body 2" headers
rpm--A/tq/hp---B/tq/hp----C/tq/hp---D/tq/hp
3700-----------------------------------------586/413
3800-----------------------------------------598/433
3900-----------------------------------------607/451
4000-521/397-------------------524/399---619/471 = +72 hp
4100-525/410---519/405----524/409---632/493
4200-555/444---533/426----545/436---631/505
4300-594/486---588/481----599/490---635/520
4400-605/507---594/498----617/517---636/532
4500-611/524---618/530----618/530---640/548 = +18 hp
4600-628/550---623/546----628/550---635/556
4700-632/565---634/567----630/564---635/568 = + 4 hp
4800-628/574---637/582----635/581---632/578 = - 3 hp
4900-630-587---632/589----634/592---626/584
5000-624/594---625/595----632/602---619/589 = -13 hp
5100-623/605---626/608----625/607---619/601
5200-617/611---622/616----624/618---612/606
5300-615/620---621/627----619/625---606/612
5400-609/626---620/637----609/626---599/616
5500-603/631---606/635----612/640---593/621 = -19 hp
5600-591/630---600/640----599/639---586/625
5700-587/637---600/651----597/648---578/627
5800-585/646---592/654----592/654---576/636
5900-578/649---589/661----584/656---560/629
6000-571/653---581/664----580/663---553/632 = -31 hp
6100-565/656---576/670----576/670---550/639
6200-557/658---567/669----560/661---538/635
6300-546/655---561/673----556/669---526/631
6400-541/660---549/669----544/663---516/629
6500-530/655---541/670----540/668---504/624 = -44 hp
6600-518/651---535/672----527/663---494/620 = -43 hp
6700-509/650---523/667----518/661---484/617 = -44 hp
6800--------------514/665----511/662---476/616 = -46 hp
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Re: Anyone Running Stahl 2 1/8" headers on a BB A-Body?
[Re: forphorty]
#550138
12/11/09 09:50 PM
12/11/09 09:50 PM
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Joined: Jan 2003
Posts: 16,928
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440Jim
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I Live Here
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A car with a race converter with a 5000-5500 stall speed would be better at any rpm the car sees on the track with the bigger/shorter header. But it is eye opening to see the trade off at low (street) rpm. My big block converter goes to 5400 when I mash the gas! Plus GTSDave (who this post is about) is talking about a 496 CID turning 7000 rpm. I think it is well over 500 hp and his converter should be in the range I am talking about. A 383 in a heavy car shifting at 5800 rpm would be better off with the smaller/longer header. But that is another topic. 
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Re: Anyone Running Stahl 2 1/8" headers on a BB A-Body?
[Re: 440Jim]
#550139
12/12/09 12:38 PM
12/12/09 12:38 PM
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Joined: Jan 2003
Posts: 3,048
Richmond, Tx. (Houston)
GTSDave
OP
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OP
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Posts: 3,048
Richmond, Tx. (Houston)
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Jim, If it performs like the one we cloned, then it will be closer to 800hp and I dont have a converter, I have a clutch  Great chart though. I would love to know more about the dyno headers they used. Even still, they hookers performance suprises me. So many people rag on the hookers, I never even considered them an option. -Dave
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Re: Anyone Running Stahl 2 1/8" headers on a BB A-Body?
[Re: GTSDave]
#550140
12/12/09 01:27 PM
12/12/09 01:27 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Hooker S/C headers are the best performing headers I have had on my car. 
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Re: Anyone Running Stahl 2 1/8" headers on a BB A-Body?
[Re: 440Jim]
#550141
12/12/09 01:30 PM
12/12/09 01:30 PM
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Joined: Dec 2005
Posts: 4,238
State of retirement
52savoy
master
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master
Joined: Dec 2005
Posts: 4,238
State of retirement
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Quote:
Read the chart carefully. The only difference between column C and D is the header swap.
ok..I see it now. That's for pointing it out. 
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Re: Anyone Running Stahl 2 1/8" headers on a BB A-Body?
#550142
12/12/09 04:49 PM
12/12/09 04:49 PM
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Joined: Jan 2003
Posts: 16,928
NC
440Jim
I Live Here
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I Live Here
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Posts: 16,928
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Quote:
Hooker S/C headers are the best performing headers I have had on my car.
I don't think you are using the same part number headers that Hooker makes for the '68 Cuda BB, 43" long fenderwells.
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Re: Anyone Running Stahl 2 1/8" headers on a BB A-Body?
[Re: Ari440]
#550143
12/14/09 01:56 PM
12/14/09 01:56 PM
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Joined: Jan 2003
Posts: 6,840
The Swamp
Sixpak
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master
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Posts: 6,840
The Swamp
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Quote:
Quote:
Quote:
those Stahl headers look a lot like Tubular Automotive headers except Tubular are 2"/3.5". With Tubular Automotive headers, clutch linkage can be in the stock location, easy to change plugs and good starter access. They were designed by Ed Hamburger and are supposed to be the the best flowing non-custom bb A-body headers.
... x2 i have a set i got from Muscle Motors a few years ago are made just like them from what i can see. and cost like 450 bucks.
do they work with indy heads
there are also HEDMAN HEADERS
any body use these
Tubular Auto headers will not work with an A body RB Indy SR combo without some work. I had to add about 2" to each pipe to get them under the car, and trim the web between the floor pan and outer rocker.
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Aren't there too many variables to know if swapping headers made a difference? If the dyno test was done just swapping headers alone it would be obvious. But swapping carb spacers and carbs makes the chart useless for comparing headers. 
