Conversions & Swaps LSX Engines in Non-LSX Vehicles
Sponsored by:
Sponsored by:

LS fenderwell headers

Thread Tools
 
Search this Thread
 
Old Dec 28, 2013 | 07:11 AM
  #1  
jozw30's Avatar
Thread Starter
On The Tree
10 Year Member
 
Joined: Sep 2010
Posts: 197
Likes: 1
From: Phoenix, AZ
Default LS fenderwell headers

Am thinking about trying to modify a set of tri-five fenderwell headers for my 55 Olds 88 custom (LS2). No reason other than I think it would look really cool to see the pipes in the fenderwell area. The 55 has a large open area behind the front wheel.

Does anyone have any idea which chevy motor has the exhaust ports closest to the LS, big block or small block?

I would just look for a cheap set of un-coated headers and see what happens.

I figured I could get flanges laser cut locally.

Thanks for any input.

Joe
Reply
Old Dec 28, 2013 | 07:18 AM
  #2  
ART T's Avatar
Staging Lane
 
Joined: Nov 2012
Posts: 98
Likes: 0
From: St. Petersburg,Fl
Default

Big block is closer to the LS exhaust spacing.
Reply
Old Dec 28, 2013 | 09:35 AM
  #3  
bczee's Avatar
TECH Senior Member
20 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (12)
 
Joined: Jan 2006
Posts: 6,670
Likes: 6
From: Concord, CA
Default

Start with the BBC set, there are Flanges you can buy from GM or other aftermarket suppliers (Speedway).

Get some pictures up as you do it.
Reply
Old Dec 28, 2013 | 07:45 PM
  #4  
jozw30's Avatar
Thread Starter
On The Tree
10 Year Member
 
Joined: Sep 2010
Posts: 197
Likes: 1
From: Phoenix, AZ
Default

Thanks for the help! If I end up making something worth showing, I'll post my results for sure.

Joe
Reply
Old Dec 28, 2013 | 08:07 PM
  #5  
S10xGN's Avatar
TECH Junkie
iTrader: (11)
 
Joined: Jul 2005
Posts: 3,782
Likes: 7
From: Port Neches, TX
Default

Keep in mind the bore spacing between a BBC & LS is off 0.4" per cylinder, so you'll be doing some "adjusting"...
Reply
Old Dec 28, 2013 | 08:30 PM
  #6  
jozw30's Avatar
Thread Starter
On The Tree
10 Year Member
 
Joined: Sep 2010
Posts: 197
Likes: 1
From: Phoenix, AZ
Default

I figured on cutting and fitting to the LS openings. Should I not be worried about the huge 2" primaries for these BBC headers? Won't that affect performance?

I was looking at some of the small block designs and it seems like it wouldn't be that tough to spread (cut & weld) the center pipes apart? Assuming I'd also have to move a third port too.

I might be biting off more than I can chew, but if I can find a good deal on the headers I'll give it a shot.......
Reply




All times are GMT -5. The time now is 08:13 PM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE