Register or Log In To remove these advertisements. |
|
|
|
Thread Tools | Display Modes |
05-27-2007, 10:51 AM | #1 |
Registered User
Join Date: Dec 2002
Location: tally FL
Posts: 74
|
Header fitment problems
Just wondering if anyone has noticed that many header manufacturers are building chevy exhaust ports out of what looks closer to a Ferd SBC Gt40 style port? I bought some hedman elite shortys for my 72 Jimmy and the very first thing I saw was the exhaust port flange was about 1/4" too narrow (1/8" on each side). I had port matched my exhaust to the gaskets I had on hand when i built the engine and there was no way I was going to run a header that didn't fit. Port matching the header was not an option as it voids the warranty and so much material would have to be removed that I'd have to reweld em. Simply not an option on coated headers.
I contacted hedman about it and the tech guy there stopped me cold (that's how we build em - too bad) and gave me a number to their racing division in Ga. Next day I called them and they said they only do long tube race headers. Since Summit has a store front just 250 miles away I drove up there and looked at several manufactures headers; Hedman, Hooker, Flowmaster, DynoMax and another that I forget at the moment. All of them except Hooker had a 1 1/4" width exhaust port. Well I got the Hooker's and did a minor portmatch then sent them off to be coated. They fit well and I'm happy. Here's some pics of the Hedman vs. Hooker. With these pics it's kind of hard to tell the difference but I'd like to know everyone's experience.. Hedman Hooker
__________________
1972 GMC Jimmy - 383SBC | TH350-NP203-NP205 | D60PL | 14FF Detroit | 42 TSL's | 4Xeyes | Heavy FOotE "Trail in. Trash out." Florida4x4 dot Com |
05-27-2007, 02:00 PM | #2 |
Account Suspended
Join Date: Sep 2005
Location: Monroe, WA
Posts: 3,815
|
Re: Header fitment problems
Generally exhaust ports aren't matched. There's an intentional size difference called an "anti-reversion dam" that prevents exhaust from being sucked back into the ports and cylinder.
They're shorty headers - are you really worried that the mismatch is going to cause some HP loss? |
05-27-2007, 06:13 PM | #3 |
Registered User
Join Date: Dec 2002
Location: tally FL
Posts: 74
|
Re: Header fitment problems
It's not about horsepower as much as I dont want to blow out gaskets. I also believe in matched ports. The others would have had a large step in the exhaust.
__________________
1972 GMC Jimmy - 383SBC | TH350-NP203-NP205 | D60PL | 14FF Detroit | 42 TSL's | 4Xeyes | Heavy FOotE "Trail in. Trash out." Florida4x4 dot Com |
05-27-2007, 09:32 PM | #4 |
Registered User
Join Date: Aug 2006
Location: Bakersfield,CA
Posts: 7,893
|
Re: Header fitment problems
im just wondering but how would the ports not matching blowout gaskets?
__________________
-steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME |
05-27-2007, 09:36 PM | #5 |
67-72 Addict!
Join Date: Feb 2002
Location: The TAX State!
Posts: 7,857
|
Re: Header fitment problems
What is the hooker part number?
__________________
Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads |
05-27-2007, 09:58 PM | #6 | |
Registered User
Join Date: Dec 2002
Location: tally FL
Posts: 74
|
Re: Header fitment problems
Quote:
Hooker P/N is 2466HKR
__________________
1972 GMC Jimmy - 383SBC | TH350-NP203-NP205 | D60PL | 14FF Detroit | 42 TSL's | 4Xeyes | Heavy FOotE "Trail in. Trash out." Florida4x4 dot Com |
|
Bookmarks |
|
|