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9/23/15 8:43pm - Original Message: 'Add sidepipes to long tube headers'
bcousins
Former Member
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Jacksonville, FL - USA

Vette(s):
79 L-82 4-speed. Engine stock except long tube headers. Previous owner replaced upholstery and carpet with OEM. I replaced and upgraded steering and suspension.

Joined: 12/15/2009
Posts: 36
I have a 79 L-82 that I bought 6 years ago. It has long tube headers hooked up to stock exhaust. I want to add sidepipes and haven't accurately measured, but it appears the collector is rearward of where the inlet end of the sidepipes would mount. The engine is out of the car and will shortly become a 383 stroker. Haven't bought sidepipes yet, but does anyone have experience with using existing long tube headers with aftermarket sidepipes? Here is a shot of the headers before I sent them out to be ceramic coated:



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9/25/15 10:01pm - Reply: 'Re: Add sidepipes to long tube headers'
73shark
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Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 394
I saw it done once with basically a S-bent pipe but not sure how efficient it would be.

The best side exhaust w/ headers option is the Hooker nest of snakes style.  They just don't look as good as the factory system.  I've done both.


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1973 L-82 4 spd

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9/25/15 10:21pm - Reply: 'Re: Add sidepipes to long tube headers'
bcousins
Former Member
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Jacksonville, FL - USA

Vette(s):
79 L-82 4-speed. Engine stock except long tube headers. Previous owner replaced upholstery and carpet with OEM. I replaced and upgraded steering and suspension.

Joined: 12/15/2009
Posts: 36
Thanks. I agree that since the long tube headers go back further, past where the sidepipe would mount, an s-pipe would be required that would cause more restriction than if I had short tube headers mounted to sidepipes. I may just buy the Hooker setup that includes headers and sidepipes later, but right now the budget will only allow connecting the headers back up to the stock pipes. I am already spending quite a bit to make a sweet 383 out of a tired 350, using all new parts in the refurbished block.

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9/25/15 10:38pm - Reply: 'Re: Add sidepipes to long tube headers'
73shark
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Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 394
I've seen short headers that point to the side and could be directly connected to the factory sidepipes.  Factory sidepipes and covers have gotten very pricey.  Shocked

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1973 L-82 4 spd

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9/26/15 10:43am - Reply: 'Re: Add sidepipes to long tube headers'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19454
I've used "regular" headers attached to factory(and aftermarket) side pipes via "S" bends several times. As long as the bends are smooth, and the pipe size is correct, there's no issues in using the "S" pipes. Thumbs Up

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9/26/15 11:02am - Reply: 'Re: Add sidepipes to long tube headers'
73shark
Standard Member
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Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 394
Any bend in a pipe or hose introduces some friction to the flow of whatever is inside. I would recommend increasing the pipe size of the S-bend about a half inch greater than the side exhaust pipe for factory side exhaust. You can reduce the diameter down where it connects to the side exhaust.

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1973 L-82 4 spd

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9/26/15 2:14pm - Reply: 'Re: Add sidepipes to long tube headers'
bcousins
Former Member
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Jacksonville, FL - USA

Vette(s):
79 L-82 4-speed. Engine stock except long tube headers. Previous owner replaced upholstery and carpet with OEM. I replaced and upgraded steering and suspension.

Joined: 12/15/2009
Posts: 36
Thanks for the tips. It would be interesting to dyno different configurations, but that's not in the current budget either. I need to get my car put back together and on the road so I can enjoy driving on the cooler Fall and Winter days. Thanks again.

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9/27/15 5:21am - Reply: 'Re: Add sidepipes to long tube headers'
rod7515 Lifetime Member
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Red Lion, PA - USA

Vette(s):
1974 White 350 Corvette, TH400 Automatic 1972 Tangerine /Go Mango Convertible 383 Stroker, 2004r Automatic

Joined: 10/27/2006
Posts: 1172
When I bought my side pipes I was going to use the s pipe method but once I looked at the spacing I decided to go with a side pipe header. It made an easier change because the headers only took 1 hour to change out. There looked as thou there would be enough room but it would have made a tight fit and lots of work. Either way you go you will love the sound of the side pipes! Watch out for which covers you end up with for the pipes, many on here have the dreaded leg burn tattoo. Best of luck
Rodney 


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9/27/15 8:42am - Reply: 'Re: Add sidepipes to long tube headers'
bcousins
Former Member
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Jacksonville, FL - USA

Vette(s):
79 L-82 4-speed. Engine stock except long tube headers. Previous owner replaced upholstery and carpet with OEM. I replaced and upgraded steering and suspension.

Joined: 12/15/2009
Posts: 36
Ha, ha! Thanks but too late for the warning about the leg tattoo. Many years around Vettes and motorcycles, I have several. 

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9/27/15 6:37pm - Reply: 'Re: Add sidepipes to long tube headers'
73shark
Standard Member
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Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 394
The factory pipes have an insulator and just get hot enuf to be painful but not scar.Ermm

|UPDATED|9/27/2015 4:37:37 PM (AZT)|/UPDATED|


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1973 L-82 4 spd

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