Headers for a stock L-82

Posted: 8/23/13 10:03am Message 1 of 3

Reply

Quote

dapperdan

Former Member

Send PM

COLUMBUS, NC - USA

Joined: 8/19/2012

Posts: 42

Vette(s): 2011 Grand Sport Coupe, 6-speed 1977 Coupe L82, 4-speed

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.

Re: Headers for a stock L-82

Posted: 8/23/13 7:50pm Message 2 of 3

Reply

Quote

Sarge81

Lifetime Member

Send PM

WEST SENECA, NY - USA

Joined: 12/3/2001

Posts: 2379

Vette(s): 1981 Blue Ice Met. w/pearl ghost flames TKO500 5speed. LS1 Swap 3.45 Dana 44.

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

Re: Headers for a stock L-82

Posted: 9/4/13 9:25am Message 3 of 3

Reply

Quote

gwood39617

Former Member

Send PM

Cumming, GA - USA

Joined: 7/8/2013

Posts: 19

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

....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|

Topic: Headers for a stock L-82

in Forum: C3 Engines