FYI Headers for Lowered Trucks - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Frank_Zeller · 01-07-2003, 11:05 AM

Been wanting to replace the old full length Hedmans with 3/4 lenght headers. Did not want to spend the 220 for the Dynomax WLK-86118 3/4 length coated header. Found the painted version WLK-85118 for 109 at summit

the specs

Chevrolet: 1964-88 283-400, Chevelle/Malibu/El Camino, 1967-81 Camaro, 1 1/2 in. primary tubes, 2 1/2 in. collectors, painted, shorty header

Project1970 · 01-07-2003, 01:47 PM

Did you notice any difference in power vs. the long tube headers? I'd just as soon avoid any clearance issues since I have slammed my front crossmember on the occasional big bump and I've only dropped it 2.5" / 4".

Frank_Zeller · 01-07-2003, 03:40 PM

Have not installed them yet......The Headmans have 1-5/8 primary with 3 inch collector vs. 1-1/2 primary with 2.5 inch collector.

This is from the Dynomax site

Primary Tube Length

Determines torque above or below the peak horsepower RPM point. Shorter tubes add torque above the peak RPM point and reduce torque below. Longer tubes add torque below the peak RPM point and reduce torque above it.

Primary Tube Diameter

Determines peak horsepower RPM point. Use small diameter tubes on small CID engines to produce mid-to-high-RPM torque. Use large diameter on large CID engines to produce mid-to-high-RPM torque. If in doubt, use smaller diameter tubes

baggedondubs67 · 01-09-2003, 05:33 AM

sorry this might sound stupied but my truck is in the shop getting bagged and I need shorty style headers you think these will fit my 67 SWB?

Frank_Zeller · 01-09-2003, 10:00 AM

Do a search on "Headers for Lowered Trucks" on the board.

01-07-2003, 11:05 AM	#1
Frank_Zeller Registered User Join Date: Jun 2001 Location: Austin, Texas Posts: 796	FYI Headers for Lowered Trucks Been wanting to replace the old full length Hedmans with 3/4 lenght headers. Did not want to spend the 220 for the Dynomax WLK-86118 3/4 length coated header. Found the painted version WLK-85118 for 109 at summit the specs Chevrolet: 1964-88 283-400, Chevelle/Malibu/El Camino, 1967-81 Camaro, 1 1/2 in. primary tubes, 2 1/2 in. collectors, painted, shorty header __________________ 69 SWB C/10 5-6 drop 700R4 69 Firebird Convert 455 4 spd 70 Torino GT Convert Austin-Texas

01-07-2003, 01:47 PM	#2
Project1970 14.1 @ 96MPH Join Date: Jul 2001 Location: Mesa, AZ Posts: 2,811	Did you notice any difference in power vs. the long tube headers? I'd just as soon avoid any clearance issues since I have slammed my front crossmember on the occasional big bump and I've only dropped it 2.5" / 4". __________________ Project1970 - LS1 Swap Complete!

01-07-2003, 03:40 PM	#3
Frank_Zeller Registered User Join Date: Jun 2001 Location: Austin, Texas Posts: 796	Have not installed them yet......The Headmans have 1-5/8 primary with 3 inch collector vs. 1-1/2 primary with 2.5 inch collector. This is from the Dynomax site Primary Tube Length Determines torque above or below the peak horsepower RPM point. Shorter tubes add torque above the peak RPM point and reduce torque below. Longer tubes add torque below the peak RPM point and reduce torque above it. Primary Tube Diameter Determines peak horsepower RPM point. Use small diameter tubes on small CID engines to produce mid-to-high-RPM torque. Use large diameter on large CID engines to produce mid-to-high-RPM torque. If in doubt, use smaller diameter tubes __________________ 69 SWB C/10 5-6 drop 700R4 69 Firebird Convert 455 4 spd 70 Torino GT Convert Austin-Texas

01-09-2003, 10:00 AM	#5
Frank_Zeller Registered User Join Date: Jun 2001 Location: Austin, Texas Posts: 796	Do a search on "Headers for Lowered Trucks" on the board. __________________ 69 SWB C/10 5-6 drop 700R4 69 Firebird Convert 455 4 spd 70 Torino GT Convert Austin-Texas

01-09-2003, 05:33 AM	#4
baggedondubs67 Registered User Join Date: Jan 2003 Location: Avenal, Ca. Posts: 22	sorry this might sound stupied but my truck is in the shop getting bagged and I need shorty style headers you think these will fit my 67 SWB?



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