Exhaust Manifolds - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Palf70Step** · 01-26-2023, 03:42 PM

The headers I have on my 70 were bought in the early 70's. Not sure of the brand. I was thinking about going back to a Ram horn style manifold. I'd like to use the 2-1/2 ones. Do the manifolds have to angle back for out trucks or do the straight down ones like on the corvette work?

OregonNed · 01-26-2023, 03:43 PM

Quote:

Originally Posted by Palf70Step

The headers I have on my 70 were bought in the early 70's. Not sure of the brand. I was thinking about going back to a Ram horn style manifold. I'd like to use the 2-1/2 ones. Do the manifolds have to angle back for out trucks or do the straight down ones like on the corvette work?

Interested too..

**too much stuff** · 01-26-2023, 03:56 PM

I think if your small block is in the forward position like a factory V-8, the angled ones would be correct. If in the rear position like a 4x4, the straight dumps would be correct.

truckster · 01-26-2023, 04:46 PM

4WD goes straight down. I believe 2WD is angled.

01-26-2023, 03:42 PM	#1
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,268	Exhaust Manifolds The headers I have on my 70 were bought in the early 70's. Not sure of the brand. I was thinking about going back to a Ram horn style manifold. I'd like to use the 2-1/2 ones. Do the manifolds have to angle back for out trucks or do the straight down ones like on the corvette work? __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

01-26-2023, 03:56 PM	#3
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,801	Re: Exhaust Manifolds I think if your small block is in the forward position like a factory V-8, the angled ones would be correct. If in the rear position like a 4x4, the straight dumps would be correct. __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

01-26-2023, 04:46 PM	#4
truckster Registered User Join Date: Jan 2001 Location: Orem, Utah Posts: 7,984	Re: Exhaust Manifolds 4WD goes straight down. I believe 2WD is angled. __________________ I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson

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