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#1
05-21-2026, 07:13 PM
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Your Headers Are A Waste Of Money?
Nice series of Dyno runs on a 474CI Pontiac with E- D port heads. Some interesting results.
https://www.youtube.com/watch?v=eTOR9afWCRY
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https://www.flickr.com/photos/197745168@N07/ "The biggest areas that have been a disaster moving from truth to subjectivity are academia (esp science), media, and law." |
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#2
05-21-2026, 07:37 PM
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Good video.
I found the "same" D-port manifolds, off a 70 GTO, for next to nothing. Using them on the gal's 428 1973 Firebird. No head porting will be done.
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79 Trans Am WS6 71 Formula 72 Formula 71 Firebird 69 Firebird |
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#3
05-21-2026, 08:40 PM
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Similar to my thread in the street section. Only lost 4 hp from 1 3/4 headers to ram air manifolds and 3" head pipes.
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72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007 (cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD 1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.45 @ 88.1 mph on slippery street tires.Bad 2.19 60ft.Owned since 86' |
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#4
05-21-2026, 08:57 PM
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Cliff notes for those of us that don't watch online videos?
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#5
05-22-2026, 07:14 AM
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I saw that. Good info for people not wanting hassle of headers. Good performance.
I ran ra3 manifolds on my 455 for years with 2.5 exhaust.
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#6
05-22-2026, 07:33 AM
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Believable, for some combos. I think Exhaust Reversion is tackled in the Collector implementation, and that is where implementation matters after the Dyno eval.
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95 Towncar that needs more TQ. Sold 2023: 12.24/111.6MPH/1.76 60'/28"/3.54:1/SP-TH400/469 R96A/236-244-112LC/1050&TorkerI//3850Lbs//15MPG/89oct Sold 2003: 12.00/112MPH/1.61 60'/26"x3.31:1/10"/469 #48/245-255-110LSA/Q-Jet-Torker/3650Lbs//18MPG 94oct Sold 1994: 11.00/123MPH/1.50 60'/29.5"x4.10:1/10"/469 #48/245-255-110LSA/Dual600s-Wenzler/3250Lbs//94oct |
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#7
05-22-2026, 11:25 AM
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This video has tons of great info,thanks. Fuel pumps and pressure, reading plugs, spacers, manifolds vs headers. I wish they would have given headflow and some vague cam specs, though.
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Chris D 69 GTO Liberty Blue/dark blue T400, 9" w 3.50s, 3905lbs 461, 850 Holley, T2, KRE 310s, Comp HR 236/242D .572/.594L, RA manifolds, 11.53@114, 1.55/60 The spare: 467, 850 Holley, T2, Edelbrock Dport 310cfm w RA manifolds, Howard HFT 245/251D .561/.594L, 11.59@ 114, 1.57/ 60' |
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#8
05-26-2026, 03:19 PM
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totally unbelievable! I've done header vs manifold tests on the dyno and in cars with opposite results. The HP peak seams about 50-100 high.
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