Exhaust manifolds - The 1947 - Present Chevrolet & GMC Truck Message Board Network

real69ss · 04-27-2014, 03:30 AM

My 68' was an inline 6 with a power glide. At some point a 350 with a th350 made it's way between the fenders. It has a hokey exhaust so I bought a complete new one from LMC to be used with the exhaust manifolds. The manifolds on the truck came with what ever engine that is in it now now. Does anyone know what the correct manifolds look like? Gonna call LMC Monday to see what they suggest and if they have the ones I need.

Thank you!

jjzepplin · 04-27-2014, 05:07 AM

These I think.
http://www.ebay.com/itm/370906437869...84.m1423.l2649

71K20chevy · 04-27-2014, 08:11 AM

It's my understanding that all the trucks came with the ramhorns pictured above, the 2wd ones are exactly are shown, but the 4wd ones dump straight down due to crossmember fitment issues.

Mike C · 04-27-2014, 10:33 AM

What position is the small block in? If they dropped it in the rear position (left the 6 cylinder mounts on the frame) then you can probably do the straight dump manifolds. Get some 2 1/2" Corvette ones from Speedway motors.

I've thought about moving my motor in my '69 short step back to use the straight dump manifolds, and if I wind up doing a TH200 4R I will for sure. This will shorten the rear driveshaft which makes a one piece-er shorter.

sKnNyPpY · 04-27-2014, 10:33 AM

Quote:

Originally Posted by jjzepplin

These I think.
http://www.ebay.com/itm/370906437869...84.m1423.l2649

I bought a set of these till I get my originals redone. I think they are Dormans with the serial numbers removed and some rough flashing ground off. Good fit horrible finish great price.

68gmsee · 04-27-2014, 10:37 AM

Be aware that some of the cheaper aftermarket rams horn manifolds don't have the same finish quality that the originals had. Best thing is to look for them in the salvage years or post in the WTB forum. Another thing is to buy the more expensive but better quality aftermarket ones.

seattle gmc · 04-27-2014, 12:22 PM

I also bought an exhaust kit from LMC. I ended up needing to replace my original rams horn on the passenger side because it was cracked. Decided to replace both, but i made the mistake of buying each from two different vendors. I bought one from LMC and the other from rok auto. Despite what everyone is thinking, the one from lmc fit great with no issues while the one from rok auto was complete junk. It had the holes for the smog tubes, even the description said it didn't. And the casting wasn't machined properly, so I cant seem to stop the exhaust leek on the side of the engine, that this manifold is mounted to.

To help answer you question we need more info on the truck, 2wd or 4wd? The good thing about a 4wd, is the rams horn dump straight down and are not specific to one side of the engine. Pics would help. Dont even bother trying to call lmc for tech support, as there is none.

real69ss · 04-27-2014, 01:38 PM

Thanks everyone. I'm just going this route as a temporary fix on my daily driver, until I can afford to upgrade my drive train. Crate motor, 700r4, 5 lug etc... I'll contact LMC on Monday.

04-27-2014, 03:30 AM	#1
real69ss Registered User Join Date: Apr 2010 Location: Glendale,AZ Posts: 45	Exhaust manifolds My 68' was an inline 6 with a power glide. At some point a 350 with a th350 made it's way between the fenders. It has a hokey exhaust so I bought a complete new one from LMC to be used with the exhaust manifolds. The manifolds on the truck came with what ever engine that is in it now now. Does anyone know what the correct manifolds look like? Gonna call LMC Monday to see what they suggest and if they have the ones I need. Thank you! __________________ 1968 C/10 short bed 1969 SS 396 Camaro "there's no replacement for displacement"

04-27-2014, 05:07 AM	#2
jjzepplin Registered User Join Date: Feb 2012 Location: Ruskin Florida Posts: 4,569	Re: Exhaust manifolds These I think. http://www.ebay.com/itm/370906437869...84.m1423.l2649 __________________ 70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350

04-27-2014, 08:11 AM	#3
71K20chevy Registered User Join Date: Jul 2012 Location: Ft Wayne Indiana Posts: 1,205	Re: Exhaust manifolds It's my understanding that all the trucks came with the ramhorns pictured above, the 2wd ones are exactly are shown, but the 4wd ones dump straight down due to crossmember fitment issues. __________________ 71 K20 64 GMC mud truck

04-27-2014, 10:33 AM	#4
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,734	Re: Exhaust manifolds What position is the small block in? If they dropped it in the rear position (left the 6 cylinder mounts on the frame) then you can probably do the straight dump manifolds. Get some 2 1/2" Corvette ones from Speedway motors. I've thought about moving my motor in my '69 short step back to use the straight dump manifolds, and if I wind up doing a TH200 4R I will for sure. This will shorten the rear driveshaft which makes a one piece-er shorter. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

04-27-2014, 10:37 AM	#6
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Exhaust manifolds Be aware that some of the cheaper aftermarket rams horn manifolds don't have the same finish quality that the originals had. Best thing is to look for them in the salvage years or post in the WTB forum. Another thing is to buy the more expensive but better quality aftermarket ones. __________________ 68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive...

04-27-2014, 12:22 PM	#7
seattle gmc Registered User Join Date: Dec 2013 Location: Seattle, WA Posts: 155	Re: Exhaust manifolds I also bought an exhaust kit from LMC. I ended up needing to replace my original rams horn on the passenger side because it was cracked. Decided to replace both, but i made the mistake of buying each from two different vendors. I bought one from LMC and the other from rok auto. Despite what everyone is thinking, the one from lmc fit great with no issues while the one from rok auto was complete junk. It had the holes for the smog tubes, even the description said it didn't. And the casting wasn't machined properly, so I cant seem to stop the exhaust leek on the side of the engine, that this manifold is mounted to. To help answer you question we need more info on the truck, 2wd or 4wd? The good thing about a 4wd, is the rams horn dump straight down and are not specific to one side of the engine. Pics would help. Dont even bother trying to call lmc for tech support, as there is none. __________________ 1970 GMC K2500 aka MaTeR 2007 Chevy Silverado 1500HD Classic

04-27-2014, 01:38 PM	#8
real69ss Registered User Join Date: Apr 2010 Location: Glendale,AZ Posts: 45	Re: Exhaust manifolds Thanks everyone. I'm just going this route as a temporary fix on my daily driver, until I can afford to upgrade my drive train. Crate motor, 700r4, 5 lug etc... I'll contact LMC on Monday. __________________ 1968 C/10 short bed 1969 SS 396 Camaro "there's no replacement for displacement"



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