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8/23/13 1:03pm - Original Message: 'Headers for a stock L-82'
Former Member
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2011 Grand Sport Coupe, 6-speed 1977 Coupe L82, 4-speed

Joined: 8/19/2012
Posts: 42
I'm thinking about putting headers on my stock '77 L-82.  McJack's has 4 different versions depending on the diameter of the tubes and the size of the collectors.  Two of the versions are "D" port, as opposed to rectangular port.  I have no idea what the configuration of the ports are on my engine.  Anybody know what the port configuration is on a stock L-82?  Don't want to take the manifolds off to find out.  Would rather have the new headers ready to be installed before taking off the originals.

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8/23/13 10:50pm - Reply: 'Re: Headers for a stock L-82'
Sarge81 Lifetime Member
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1981 Blue Ice Met. w/pearl ghost flames TKO500 5speed. LS1 Swap 3.45 Dana 44.

Joined: 12/3/2001
Posts: 2377
Stock L-82 heads are rectangular port. 


GEN III 5.7L "LS6" Engine swap
TKO500 5 spd.
3.54 Dana 44
'69 "N11" Sidepipes
Borgeson Steering Box
Born 8/1981
Sequence #3975

Click here to see more pics of my Vette on CarDomain.

Lifetime Member #26
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9/4/13 12:25pm - Reply: 'Re: Headers for a stock L-82'
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Cumming, GA - USA

1975 Corvette L-82 4-speed Coupe Rare Dark Red/Dark Red Combo 732 74L one California owner 36years

Joined: 7/8/2013
Posts: 19
....also, I believe they are 2.5 in. out the engine, back to the L-48 2.0 in. collector, and then back to 2.5 in. all the way back........not the best config.
L-48's are simply 2.0 in. from the manifold, all the way out the back of the car like it should be.
L-82's SHOULD be 2.5in. from manifold back.....but both engines used the same 2.0 in. collector.......bogging down the L-82, ......just like that crappy caty. converter design,.....two pipes into one converter,.....enough to make one sick.....horrible design......(can you tell I own a '75 L-82)?!......haha
Chevrolet was too cheap to build/install a 2.5 in. collector to put in the L-82 cars during the 70's
Oops......the MOPAR is coming out in me!.....lol

* I would tell him you want 2.5in. all the way back, true dual w/o that caty. converter (if you do not live in Cali.)
you will get better mileage and see #'s closer to 275hp/275lb.-ft

(orphaned post added here-aapple)

|UPDATED|9/4/2013 9:25:18 AM (AZT)|/UPDATED|
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