'77 L-82 Exhaust Question
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Racer
Joined: Dec 2000
Posts: 472
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From: Springfield GA
'77 L-82 Exhaust Question
I need to purchase the front & rear 'Y' pipe sections for my '77 L-82. The L-82 exhaust at the manifold started at 2", but then was larger at 2 1/2" the remainder of the pipe. I see that most all of the aftermarket vendors sell these pipes, but they're for 'all' '77's, which means a standard L-48, 2" exhaust. Can anyone tell me who sells the correct, larger diameter L-82 front/rear 'Y' pipes? They do offer 2 different 'Y' pipes (L-48 & L-82) for the '78 & '79's. I wonder if I should just order the '78 L-82 pipes for my '77, as I'm sure there wasn't much difference if any.... Thanks!!
Racer
Joined: Dec 2004
Posts: 379
Likes: 0
From: Fairfield Texas
According to My reference books the 77 L48 and L82 and the 78
L48 used the same 2inch system with only the 78 L82 receiving the
2 1/2 inch which then carried over to 79 for both L48 &L82 engines,
which is what I think You pointed out. Anytime You can increase the
exhaust flow with larger piping,thats the way to go therefore I would
use the 78 L82-79 system.I installed 2 1/2 inch true duals on My 77
and 79 and it really made a difference in performance. I wonder if You
go to the 2 1/2 inch system,will it bolt up to Your present converter?
L48 used the same 2inch system with only the 78 L82 receiving the
2 1/2 inch which then carried over to 79 for both L48 &L82 engines,
which is what I think You pointed out. Anytime You can increase the
exhaust flow with larger piping,thats the way to go therefore I would
use the 78 L82-79 system.I installed 2 1/2 inch true duals on My 77
and 79 and it really made a difference in performance. I wonder if You
go to the 2 1/2 inch system,will it bolt up to Your present converter?
Burning Brakes
Joined: Jan 2006
Posts: 876
Likes: 1
From: Same as our leaders Out of my mind
I believe I have an original stock Y pipe and catalytic converter in excellent shape from my 79 L-82 in the basement. It is late now, tomorrow I will measure the diameter of the pipes to confirm and post a reply. 
Burning Brakes
Joined: Jan 2006
Posts: 876
Likes: 1
From: Same as our leaders Out of my mind
FOUND - Stock 79 Y pipe
Hi,
I do have the manifold you are looking for if used is the way you are willing to go. It is in very good condition. I also have the original cat, exhaust manifolds and air injection manifolds. My e-mail is icanfixitforyou@aol.com
Lee
I do have the manifold you are looking for if used is the way you are willing to go. It is in very good condition. I also have the original cat, exhaust manifolds and air injection manifolds. My e-mail is icanfixitforyou@aol.com
Lee
