Re: Cool shootout; 472 HEMI Stroker - Headers VS Manifolds
[Re: INTMD8]
#2719798
11/27/19 04:37 PM
11/27/19 04:37 PM
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Joined: Jan 2003
Posts: 5,106 Chicago Blackhawks
hemicar1971
master
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master
Joined: Jan 2003
Posts: 5,106
Chicago Blackhawks
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If it is quarter mile performance there is more to going fast than headers or manifolds. As for Exhaust Manifolds and they are a nice factory piece I would leave them alone and find ones that are already altered or buy a set of repros and port them with no hear riser. At one time in I isle at Carlisle Mario sold Auminum Hemi exhaust manfolds. You save a lot of weight running those and I believe a few FAST hemi cars have them on. Every area of the motor can be altered for more HP like the stock intake manifold with a Vanke Mod,, changing rocker ratios. Leaving a little on the table is not a bad thing.
Last edited by hemicar1971; 11/27/19 04:38 PM.
1971 HEMI E BODY REGISTRY
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Re: Cool shootout; 472 HEMI Stroker - Headers VS Manifolds
[Re: hemicar1971]
#2719803
11/27/19 05:00 PM
11/27/19 05:00 PM
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Joined: May 2019
Posts: 712 Lake Villa Il
INTMD8
super stock
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super stock
Joined: May 2019
Posts: 712
Lake Villa Il
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It's not an original hemi car, I believe the manifolds I have are reproductions.
Didn't know they made aluminum ones, very interesting.
Last edited by INTMD8; 11/27/19 05:00 PM.
69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700
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Re: Cool shootout; 472 HEMI Stroker - Headers VS Manifolds
[Re: INTMD8]
#2719943
11/28/19 04:26 AM
11/28/19 04:26 AM
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Joined: Aug 2003
Posts: 43,124 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,124
Bend,OR USA
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I'll provide some at the track results from two of my cars, both wedge powered, not hemiroid powered, with the muffs and pipes on versus no muffs and pipes removed. Example #1 was my 1969 Dart GTS 440 powered street and strip bracket car at LACR 1/4 mile back in the late 1990s or maybe early 2000, the car ran 12.29 ET at 109.4 MPH with a new set of M/T 105x28.5x15 with 11.0 lbs. in them on the first run at around 6:000 PM on a Friday night T&T with the 2.5 inch exhaust system that consisted of a set of Hooker 1 7/8 A body fenderwell headers hooked up with about 16.0 inches of 2.5 head pipes to a set of Thrust 2 1/2 inch in and out Corvair Turbo muffs with a set of 2.5 inch side pipes going over to the rocker panel directly in front of the rear tires. 2nd run was with 10.5 Lbs. in the slicks 45 minutes later with no other changes, the car ran 12.27 at 109.5 MPH, the last run that night was around 9:00 PM with 10.0 Lbs. in the slicks which resulted in a run of 12.23 at 109.7 MPH. This was a 3 day event with T&T on Friday night with the gates opening at 4:30 PM , first TT at 6.:00 PM stopping at 10::00 PM. Saturday the gates opened at 8:00 A.M with the first TT at around 9:00 :AM, closing at 10:PM Sunday had the same schedule with closing at the end of racing. I got to the track around 9:00 AM and removed the exhaust system from the headers back and let the tires down to 9.5 Lbs. with no other changes and made the first TT run around 10:30 AM, it ran 11.39 at 117.6 MPH I didn't believe it so I made another run at around 11:10 AM on the other side (L/S) of the track, which with that car was normally around .02 to .03 ET slower. It ran 11.42 at 117.7 MPH I did some similar testing with my last street and strip car at Madras, OR a 1/8 mile track it had a pump gas 512 C.I. low deck stroker motor with a six pack and a complete 3.0 exhaust system with the same Hooker headers off of the old Dart fed into 3.0 inch pipes ran to the rear of the car with a set of Magna Flow muffs that where 3.0 inch side inlet by 7.0 inch thick by 14.0 oval with a 3.0 inch center outlet with a piece of perforated straight through pipe in it, the muffs where mounted at the rear bumper with 45 degree turn downs straight out of them. That car ran a best of 7.01 ET at 95.3 MPH with the system on and it picked up to 6.98 ET at 95.5 MPH with the complete system removed I'm thinking the weight was where the small perforamnce gains where made, not the exhaust system restrictions Happy Thanksgiving to all
Last edited by Cab_Burge; 11/28/19 04:29 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Cool shootout; 472 HEMI Stroker - Headers VS Manifolds
[Re: hemicar1971]
#2719967
11/28/19 09:43 AM
11/28/19 09:43 AM
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Joined: Nov 2010
Posts: 3,696 jersey
Spaceman Spiff
master
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master
Joined: Nov 2010
Posts: 3,696
jersey
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If it is quarter mile performance there is more to going fast than headers or manifolds. As for Exhaust Manifolds and they are a nice factory piece I would leave them alone and find ones that are already altered or buy a set of repros and port them with no hear riser. At one time in I isle at Carlisle Mario sold Auminum Hemi exhaust manfolds. You save a lot of weight running those and I believe a few FAST hemi cars have them on. Every area of the motor can be altered for more HP like the stock intake manifold with a Vanke Mod,, changing rocker ratios. Leaving a little on the table is not a bad thing. Some of the ‘62 “ Swiss cheese” catalinas had aluminum exhaust manifold, but they found that they would actually start to melt.
526 cubes of angry wedge, pushbutton shifted, 9 passenger killer!
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Re: Cool shootout; 472 HEMI Stroker - Headers VS Manifolds
[Re: INTMD8]
#2726295
12/23/19 01:38 AM
12/23/19 01:38 AM
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Joined: Jan 2003
Posts: 7,477 Minnesota
Hemi_Joel
master
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master
Joined: Jan 2003
Posts: 7,477
Minnesota
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The dyno testing I did when I was developing my fast motors does not agree with there's whatsoever. 612 versus 588 horse, and 795 vs 762 horsepower. Nicks Hemi seemed to stumbled at the top end of the pull with the manifolds. I wonder if something was going away, or if the jetting was off? Bringing this back from the dead. The 612 vs 588 horsepower, was that on as-cast or ported manifolds? Trying to decide between headers and porting my manifolds. Thanks! On the 588 horse motor, the exhaust manifolds were bone stock. On the 762 horse, they were extrude honed and ported.
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: Cool shootout; 472 HEMI Stroker - Headers VS Manifolds
[Re: Hemi_Joel]
#2726360
12/23/19 11:30 AM
12/23/19 11:30 AM
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Joined: Jan 2003
Posts: 14,492 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,492
So. Burlington, Vt.
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Something that’s important to keep in mind here is........ depending on how the cam is configured...... the difference between the headers and manifolds could vary greatly.
A cam designed to minimize the losses when used with manifolds isn’t going to gain as much by going to headers as the cam that essentially requires headers is going to lose by running it with ex manifolds. One might show a 20-30 difference....... the other could be close to 100hp.
The takeaway is....... there is no standard answer as to how much headers are worth.
As with just about everything relating to making more power...... “it depends”.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Cool shootout; 472 HEMI Stroker - Headers VS Manifolds
[Re: Cab_Burge]
#2726361
12/23/19 11:45 AM
12/23/19 11:45 AM
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Joined: Jun 2006
Posts: 5,161 CT
GTX MATT
master
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master
Joined: Jun 2006
Posts: 5,161
CT
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I'll provide some at the track results from two of my cars, both wedge powered, not hemiroid powered, with the muffs and pipes on versus no muffs and pipes removed. Example #1 was my 1969 Dart GTS 440 powered street and strip bracket car at LACR 1/4 mile back in the late 1990s or maybe early 2000, the car ran 12.29 ET at 109.4 MPH with a new set of M/T 105x28.5x15 with 11.0 lbs. in them on the first run at around 6:000 PM on a Friday night T&T with the 2.5 inch exhaust system that consisted of a set of Hooker 1 7/8 A body fenderwell headers hooked up with about 16.0 inches of 2.5 head pipes to a set of Thrust 2 1/2 inch in and out Corvair Turbo muffs with a set of 2.5 inch side pipes going over to the rocker panel directly in front of the rear tires. 2nd run was with 10.5 Lbs. in the slicks 45 minutes later with no other changes, the car ran 12.27 at 109.5 MPH, the last run that night was around 9:00 PM with 10.0 Lbs. in the slicks which resulted in a run of 12.23 at 109.7 MPH. This was a 3 day event with T&T on Friday night with the gates opening at 4:30 PM , first TT at 6.:00 PM stopping at 10::00 PM. Saturday the gates opened at 8:00 A.M with the first TT at around 9:00 :AM, closing at 10:PM Sunday had the same schedule with closing at the end of racing. I got to the track around 9:00 AM and removed the exhaust system from the headers back and let the tires down to 9.5 Lbs. with no other changes and made the first TT run around 10:30 AM, it ran 11.39 at 117.6 MPH I didn't believe it so I made another run at around 11:10 AM on the other side (L/S) of the track, which with that car was normally around .02 to .03 ET slower. It ran 11.42 at 117.7 MPH I did some similar testing with my last street and strip car at Madras, OR a 1/8 mile track it had a pump gas 512 C.I. low deck stroker motor with a six pack and a complete 3.0 exhaust system with the same Hooker headers off of the old Dart fed into 3.0 inch pipes ran to the rear of the car with a set of Magna Flow muffs that where 3.0 inch side inlet by 7.0 inch thick by 14.0 oval with a 3.0 inch center outlet with a piece of perforated straight through pipe in it, the muffs where mounted at the rear bumper with 45 degree turn downs straight out of them. That car ran a best of 7.01 ET at 95.3 MPH with the system on and it picked up to 6.98 ET at 95.5 MPH with the complete system removed I'm thinking the weight was where the small perforamnce gains where made, not the exhaust system restrictions Happy Thanksgiving to all Thrush turbo mufflers really kill power if you're making some. I had a set on my Plymouth, and I spent 3 summers chasing various issues that made the car just feel like it was 100 HP down from where it should have been. Finally one of the last changes was mufflers (changed to Ultra Flos) and the car felt night and day different. There was actually an episode of Motor Trend's engine masters some time later and they found that the Thrush mufflers were the worst of all the Turbo mufflers tested. Mine sure did sound good though. They were the Thrush Hush, which is different than the California Turbo model.
Last edited by GTX MATT; 12/23/19 11:47 AM.
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
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