best fitting headers, 4x4 4spd - The 1947 - Present Chevrolet & GMC Truck Message Board Network

8mag · 07-20-2003, 12:26 AM

need opinons on headers. built a new 400 sb, vortec heads, erson cam,9to1 compression. have corvette ramshorns and 21/2inch dual into single 70 series 3inch flowmaster. very quiet and not as much power as i had hoped. wandering-wanting to go the header route and change to 2 magnaflow mufflers. any power difference? what is the best fitting header for a 4x4 ,4spd truck. please help

JayDubBlazer · 07-20-2003, 05:34 AM

I have no personal expericnce but reader a thread a while back the dynomax cermic coated headers got good reviews. they are about 230 bucks at jegs or summit.

8mag · 07-20-2003, 06:41 PM

btt

Glen · 07-20-2003, 11:39 PM

The Dynomax headers mentioned above will not work on a 4 speed, I just found out the hard way this weekend. I wish they would fit, I would love to swap you for those manifolds.....

**'68OrangeSunshine** · 07-21-2003, 02:55 AM

I have Heddman Hedders on a crate 350 in my '71 GMC Jimmy, w/SM465.
The Heddmans fit OK, but are a little close around the starter. To replace it, you have to pull the Pass side hedder. I had to reconfigure the Z/bar on the driver's side to clear the collector down tubes, but that might have been due to the different throw-out geometry for a Centerforce II clutch. I was on a budget at the time I got this truck back on the road and the Heddman's were on sale. It's been a daily driver for 4 years.

**JIMs70GMC** · 07-21-2003, 05:32 AM

I read somewhere that the tri-ys from doug Thourley (sp) fit around the z-bar and were made for our trucks. Pricey though close to $400.

Brewski* · 07-21-2003, 09:14 AM

I went with the Ceramic Coated Hedman. It is the only one that fit on my truck. Had to have Summit order them special. I tried the Elite set from Hedman but they would not clear the linkage on the 4x4 4speed 350

07-20-2003, 12:26 AM	#1
8mag Registered User Join Date: Jun 2001 Location: nampa idaho,usa Posts: 92	best fitting headers, 4x4 4spd need opinons on headers. built a new 400 sb, vortec heads, erson cam,9to1 compression. have corvette ramshorns and 21/2inch dual into single 70 series 3inch flowmaster. very quiet and not as much power as i had hoped. wandering-wanting to go the header route and change to 2 magnaflow mufflers. any power difference? what is the best fitting header for a 4x4 ,4spd truck. please help __________________ 1972 3/4 4x4,14bolt locker rear, dana44 lock right front, sm465, sb 400, blazer tank,dual batterys,3"lift,32-9.00-16 super swampers daily driver other trucks 1972 1 ton dually 4x4,454 4 spd,,235-85-16, flat bed front and rear winches, rear gas tank and under bed gun safe.tilt wheel

07-20-2003, 05:34 AM	#2
JayDubBlazer go cyclones Join Date: Jun 2003 Location: Ames, IA Posts: 1,883	I have no personal expericnce but reader a thread a while back the dynomax cermic coated headers got good reviews. they are about 230 bucks at jegs or summit. __________________ Wes PROJECT OLE GREEN 1972 Blazer 4X4 350/700R4 2017 Silverado LT

07-20-2003, 06:41 PM	#3
8mag Registered User Join Date: Jun 2001 Location: nampa idaho,usa Posts: 92	btt __________________ 1972 3/4 4x4,14bolt locker rear, dana44 lock right front, sm465, sb 400, blazer tank,dual batterys,3"lift,32-9.00-16 super swampers daily driver other trucks 1972 1 ton dually 4x4,454 4 spd,,235-85-16, flat bed front and rear winches, rear gas tank and under bed gun safe.tilt wheel

07-21-2003, 02:55 AM	#5
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,504	I have Heddman Hedders on a crate 350 in my '71 GMC Jimmy, w/SM465. The Heddmans fit OK, but are a little close around the starter. To replace it, you have to pull the Pass side hedder. I had to reconfigure the Z/bar on the driver's side to clear the collector down tubes, but that might have been due to the different throw-out geometry for a Centerforce II clutch. I was on a budget at the time I got this truck back on the road and the Heddman's were on sale. It's been a daily driver for 4 years. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.

07-21-2003, 05:32 AM	#6
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	I read somewhere that the tri-ys from doug Thourley (sp) fit around the z-bar and were made for our trucks. Pricey though close to $400. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

07-20-2003, 11:39 PM	#4
Glen Registered User Join Date: Jan 2003 Location: Chandler, AZ Posts: 189	The Dynomax headers mentioned above will not work on a 4 speed, I just found out the hard way this weekend. I wish they would fit, I would love to swap you for those manifolds.....

07-21-2003, 09:14 AM	#7
Brewski* Registered User Join Date: Aug 2001 Location: Rocky Mount, MO Posts: 1,293	I went with the Ceramic Coated Hedman. It is the only one that fit on my truck. Had to have Summit order them special. I tried the Elite set from Hedman but they would not clear the linkage on the 4x4 4speed 350



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