78' L-82 header install.
Racer
Joined: Jul 2013
Posts: 257
Likes: 36
Mike
Last edited by hpxt; Mar 6, 2016 at 10:16 PM.
Le Mans Master
Joined: Aug 2010
Posts: 5,339
Likes: 546
From: Central Texas
Originally Posted by hdal
Street,you mean from the header back? And their muffl's? Was it 2 1/2"? Sound good no-doubt........
Racer
Joined: Jul 2013
Posts: 257
Likes: 36
2nd Gear
Joined: Jun 2015
Posts: 2
Likes: 0
From: Sayville NY
Did anyone that already did a header install have problems getting the old manifolds off? Are there tricks to getting the old bolts out without braking or snapping them off? I have been thinking about doing a header install on my 81 and these are some of my concerns.
Mike
Mike
Team Owner
Joined: Oct 2004
Posts: 81,241
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From: altered state
St. Jude Donor '05
With the motor slighly warm spraying them down with penetrating oil for a day or so may minimize risk. Cant remember the fav brand damn old age 
When you put cams in with overlap, more compression you can get a slight pinging, a thicker gauge tube helps some
Those are good noises though!
When you put cams in with overlap, more compression you can get a slight pinging, a thicker gauge tube helps some
Those are good noises though!
Last edited by cv67; Mar 7, 2016 at 01:30 PM.
Le Mans Master
Joined: Aug 2010
Posts: 5,339
Likes: 546
From: Central Texas
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Le Mans Master
Joined: Oct 2005
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From: Glen Allen, VA
I've had my Hooker Super Comp headers out a few times on my 79. Not that hard as I recall. both went in from underneath. I think I only removed the forward spark plugs, definitely the oil dipstick and as KapSa said use a spacer btwn the header flange and the A/C bracket. I did not however go from manifolds to headers, my car came with the headers when I bought it.
Instructor
Joined: Sep 2010
Posts: 229
Likes: 1
From: Grants Pass Oregon
I just put Summit Racing Headers on my '78. They fit in so clean, I thought I did something wrong. It came with every thing. Only thing is, the reducers are 2 1/4. The muffler shop made new 2 1/2 reducers then ran 2 1/2 pipe to 40 series flowmasters. I have Borg steering and the headers clear the box by a good inch or more.
Thread Starter
Instructor
Joined: Jun 2015
Posts: 182
Likes: 21
From: Alger Mich
Hey 78silver,did you use OEM intermediate pipes from reducer back to muffl's? Reason I ask:the factory pipes are flattened below the rr diff. I'm looking for more road clearance not less. Also,did you lose clearance at the header to reducer flange? My car sit fairly low. Thanx,Al
Racer
Joined: Aug 2014
Posts: 479
Likes: 93
From: Tennessee
I think probably so but after installing the vortec heads, headers, and rebuilding of my quadrajet I've been more aggressive with the accelerator pedal just to hear quadrajet howl.