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#1 |
Dork For Days
Join Date: Aug 2005
Location: Dallas
Posts: 407
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I've got a '72 C20 with a 402, but I'm considering getting one of the LMC standard exhaust kits, which has 2 1/4" pipes (mandrel bent). I assume this would flow about the same as 2.5" crimp-bent system. Since I don't spin more than 5000 RPM, this should work great.
Here's the thing. LMC advertises the kit as for smallblocks only. I can't understand the difference, especially since I'll be running headers. Since I have headers, can't I use this kit? Anybody know? I figure the bolt-up to the stock manifolds is the issue causing it to be a smallblock kit. Sound right?
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1972 C20, 402/700R4 - My first classic truck, bought in September 2005. 85% transformed from "Farm" to "Cool" status! ![]() 1970 Dodge Challenger 440, 4sp (my other toy) 12.67 @ 117 MPH, with a pathetic 2.022 60' 2007 Dodge Charger SRT-8 2008 Cadillac CTS All-American garage, baby! Last edited by MrC1; 02-11-2009 at 04:36 PM. |
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#2 |
Active Member
![]() Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: LMC exhaust kits - will it work?
FYI: I ordered the 6 cylinder kit from them since it looked simple enough. Parts were of real good quality, fitment was not.
The parts were not the same as advertised but I was able to make them work with a lot of effort. |
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#3 |
Registered User
Join Date: Sep 2005
Location: Canton North carolina
Posts: 3,079
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Re: LMC exhaust kits - will it work?
If you are using headers there should not be an issue with it working. The factory exhaust was 2.5 on bb with a 2 inch tailpipe. The 2.25 should work with no problems. If using with manifold there is considerable difference in manifold exits and some fab work would have to be done to make work.
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67 blue step side- bb 68 gold and white swb cst anniversary 68 custom swb hot rod Ls swap 69 swb cst 6 cylinder/ overdrive 69 black/black cst bb swb 70 orange and white cst Canada built truck swb bb 71 black and white super swb bb 71 red and white super swb 72 green and white super swb 4x4 62 nova wagon 400 series Ls swapped 68 Camaro 327/4 speed- 1 owner, original paint 66 Volkswagen bettle 69 auto stick Volkswagen Beetle |
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#4 |
classic=of recognized value
Join Date: Sep 2008
Location: Wichita, KS
Posts: 317
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Re: LMC exhaust kits - will it work?
Just remember that a 2.5" pipe is ~20% larger than a 2.25" pipe.
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#5 |
Nothing to see here.....
![]() Join Date: Jun 2007
Location: Shawnee, KS
Posts: 4,625
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Re: LMC exhaust kits - will it work?
take my advise, go to a quality custom exhaust shop. spend the extra dough and have something that fits..... and it will keep you off the crawler for hours.
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Doug ![]() ![]() The democracy will cease to exist when you take away from those who are willing to work and give to those who would not. Thomas Jefferson |
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#6 | |
Dork For Days
Join Date: Aug 2005
Location: Dallas
Posts: 407
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Re: LMC exhaust kits - will it work?
Quote:
Yes, but doesn't the mandrel bending make up for it? Those crimps squeeze down at least 1/2" or more.
__________________
1972 C20, 402/700R4 - My first classic truck, bought in September 2005. 85% transformed from "Farm" to "Cool" status! ![]() 1970 Dodge Challenger 440, 4sp (my other toy) 12.67 @ 117 MPH, with a pathetic 2.022 60' 2007 Dodge Charger SRT-8 2008 Cadillac CTS All-American garage, baby! |
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#7 | |
Dork For Days
Join Date: Aug 2005
Location: Dallas
Posts: 407
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Re: LMC exhaust kits - will it work?
Quote:
Would this technique make it easier since I'm not tied down to the location of the front hook-up position? I figure all I have to do is make the back of it fit and the shop will make the front fit.
__________________
1972 C20, 402/700R4 - My first classic truck, bought in September 2005. 85% transformed from "Farm" to "Cool" status! ![]() 1970 Dodge Challenger 440, 4sp (my other toy) 12.67 @ 117 MPH, with a pathetic 2.022 60' 2007 Dodge Charger SRT-8 2008 Cadillac CTS All-American garage, baby! |
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#8 |
Registered User
Join Date: Mar 2002
Location: southern calif.,usa
Posts: 200
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Re: LMC exhaust kits - will it work?
i had a muffler shop fab me up a custom system, 2 1/2 pipes with flowmasters for my small block . and it runs and sounds great
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70 c10 stepside ,350v8, m-20 4 speed ![]() |
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#9 |
Nothing to see here.....
![]() Join Date: Jun 2007
Location: Shawnee, KS
Posts: 4,625
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Re: LMC exhaust kits - will it work?
I have never installed one of thier kits, but the "ready made" exhaust kits in a box are notorious for needing tweaks. I would just have a muffler shop fab you a 2.5" aluminized manifold back system. that way, you can have your choice of mufflers, exits, etc.
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Doug ![]() ![]() The democracy will cease to exist when you take away from those who are willing to work and give to those who would not. Thomas Jefferson |
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#10 |
Dork For Days
Join Date: Aug 2005
Location: Dallas
Posts: 407
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Re: LMC exhaust kits - will it work?
I guess it's the $220 price that's getting me. I couldn;t get a custom system for that much, especially if I went with mandrel bends.
__________________
1972 C20, 402/700R4 - My first classic truck, bought in September 2005. 85% transformed from "Farm" to "Cool" status! ![]() 1970 Dodge Challenger 440, 4sp (my other toy) 12.67 @ 117 MPH, with a pathetic 2.022 60' 2007 Dodge Charger SRT-8 2008 Cadillac CTS All-American garage, baby! |
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#11 |
Nothing to see here.....
![]() Join Date: Jun 2007
Location: Shawnee, KS
Posts: 4,625
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Re: LMC exhaust kits - will it work?
had my 2.5 custom bent, turboflow, duals, with all new mounts for $250. drive in, drive out. no headaches.
check around D town, I bet you can find good deals out there!!
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Doug ![]() ![]() The democracy will cease to exist when you take away from those who are willing to work and give to those who would not. Thomas Jefferson |
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#12 | |
Phone's ringin Dude.
![]() Join Date: Mar 2007
Location: Colorado Springs
Posts: 1,426
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Re: LMC exhaust kits - will it work?
Quote:
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![]() ![]() 2003 SILVERADO SS--THE NEW GIRL 1972 GMC--THE OLD GIRL |
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#13 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: LMC exhaust kits - will it work?
some areas will RAPE you on exhaust work.
I have the kit you are asking about, and while most ppl say it fits pretty OK, I was unable to make it all work. HOWEVER... I was asking for trouble. I installed it on a leaf spring truck, with a caddy big block, and 133 inch wheel base. So don't go by my words... a lotta ppl on here have used it with much better results. |
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#14 |
The LuvShack Garage
Join Date: Jan 2004
Location: Maple Grove, TN (West Side)
Posts: 30,477
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Re: LMC exhaust kits - will it work?
Not that matters, but i used to work PT doing this stuff and this
chart (Taken out of the Flowmaster Dealer Catalog) might help.
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Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T |
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