Header on 250 I6? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

briarpatch · 05-16-2005, 10:43 AM

The exhaust manifold on my '70 C/10, 250 L6 w/ man. trans., is in rough shape. I noticed LMC Truck sells a header for this engine. Any advice on whether I should or shouldn't go this route will be appreciated.

Tim

shifty · 05-16-2005, 11:05 AM

Not sure. I just bought a new Dynomax header kit (with all bolts, gaskets, flanges and everything) for $160. It's setup for dual exhaust now. I install them next week. I'm very happy with the purchase and happy with the service also. He (Ed) beat everyone else's price on the web.

The instructions say it will work with a MT, so I'm hoping my linkage for the 3onTree won't be a problem.

Are you buying a replacement for the factory exhaust manifold or ?

briarpatch · 05-16-2005, 11:10 AM

Yes, this will be a replacement for the factory exhaust manifold. Where do I find Ed on the web? The 3onTree is one thing that has concerned me. Can I stick with single exhaust?

70 shorty · 05-16-2005, 12:20 PM

I have a header on my 250, but it has a floor shifter for the 3 spd. No clearance issues though. I does leak pretty bad at the head, I just haven't gotten around to changing the gasket (I hope that fixes it!). I don't know what kind of header it is, it came with the truck.

68w/sbc406 · 05-16-2005, 12:27 PM

i had a really bad exhaust leak at the head and ended up with 3 carb fires in one day. the first one i was able to put out with a 20 bottle of water. the second one was in a gas station but was able to suck all the flames into the carb when she fired. and the 3rd was put out by a nice man with a fire extinguisher

let me be the first to say you might want to get that fixed before it gets worse

shifty · 05-16-2005, 01:52 PM

Find Ed at www.Mothertruckers.net. Tell him you want the Dynomax headers for a 250 inline 6. Tell him you're a board member and that one of the other members sent you.

His email is ed @ mothertruckers.net, I think, but phone is a lot quicker and easier than email.

PS - I can take photos of the kit I got from him if you want to see pics before you buy.

oj70chevy · 05-16-2005, 02:15 PM

Shifty, I would like to see some befor and after pic's when your done. This sounds like something I would like to do to my 70 c/10.

shifty · 05-16-2005, 02:21 PM

I'm waiting on header paint/coating from Eastwood. I don't like the look of black headers.

I'll surely be taking pictures

briarpatch · 05-16-2005, 02:21 PM

Would like to see pics, Shifty. Thanks a lot for all the info...

*dtlilly* · 05-16-2005, 07:16 PM

You can also buy a high performance intake for these trucks that will let you run a 2 BBL carb. Combined with the header, the 250 will become alive and sound real "throaty"! A friend in Memphis had that set up on his 68.

shifty · 05-16-2005, 09:25 PM

Left the camera at the office. I gotta go in for surgery tomorrow, so I won't get the camera again until ... shoot, until I get to work on Wednesday

**Palf70Step** · 05-16-2005, 10:08 PM

I have a set from Clifford for my 250, not sure if they make them or they are made by someone else to sell with the Clifford name. Couple of things. Make sure you replace the front and rear manifold nubs with threaded studs. That tends to help with leakage that may occur over time. Also note, if this is a daily driver, you will loose the heat source for the bottom of you intake. This means it may be a bit more cantankerous on first start and take a while longer to melllow/stabilize the enging until it warms up. The aftermarket intake manifolds normally have a water source flowing through them and uses the engine water/coolant as the intake heat source.

shifty · 05-16-2005, 10:08 PM

Okay, borrowed a camera. Only thing I didn't see in the box was the new bolts, but I didn't look hard (they should be in there, it was sposta come with everything!).

Here you go:

**Palf70Step** · 05-16-2005, 10:12 PM

The listed the bolts seperate on mine, so........ they git you for more. Again remeber to get new studs for the head. The come in kits in Auto Zone and other like stores.

shifty · 05-16-2005, 10:13 PM

My current header setup is using bolts, not studs

**Palf70Step** · 05-16-2005, 10:49 PM

Bolts will works, studs make it easier to mount. Mainly replace the two end unbs with a stud (or a bolt) so you can tighten the ends down.

moodybo · 05-16-2005, 10:58 PM

The headers that lmc sells are heddman. I bought a set from a local speed shop. i had a floor shifter in so clearance was not an issue. I was not satisfied with the low clearance of the collectors. They hung down way too low for me! As for power increase it was a big differance!my 2 cents

**pjmoreland** · 05-17-2005, 01:19 AM

I had a set of Clifford headers and a Clifford intake manifold with a small four-barrel Holley carburetor on a 250 about 10 years ago. It performed pretty well for a 250. I had a single sided 2.5" exhaust with a Flowmaster muffler. It had a nice throaty sound at idle, but had a way higher pitch than a V8 at higher RPMs. Here's the link to Clifford's website. It's not cheap stuff, but it is high quality.

http://cliffordperformance.net/Merch...egory_Code=C21

05-16-2005, 10:43 AM	#1
briarpatch Registered User Join Date: May 2005 Location: Beauregard, AL Posts: 64	Header on 250 L6? The exhaust manifold on my '70 C/10, 250 L6 w/ man. trans., is in rough shape. I noticed LMC Truck sells a header for this engine. Any advice on whether I should or shouldn't go this route will be appreciated. Tim __________________ ------------------------------------- Tim '67 C/10, '04 Tahoe ------------------------------------- Last edited by briarpatch; 05-16-2005 at 11:32 AM.

05-16-2005, 11:05 AM	#2
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Not sure. I just bought a new Dynomax header kit (with all bolts, gaskets, flanges and everything) for $160. It's setup for dual exhaust now. I install them next week. I'm very happy with the purchase and happy with the service also. He (Ed) beat everyone else's price on the web. The instructions say it will work with a MT, so I'm hoping my linkage for the 3onTree won't be a problem. Are you buying a replacement for the factory exhaust manifold or ? __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

05-16-2005, 11:10 AM	#3
briarpatch Registered User Join Date: May 2005 Location: Beauregard, AL Posts: 64	Yes, this will be a replacement for the factory exhaust manifold. Where do I find Ed on the web? The 3onTree is one thing that has concerned me. Can I stick with single exhaust? __________________ ------------------------------------- Tim '67 C/10, '04 Tahoe -------------------------------------

05-16-2005, 12:20 PM	#4
70 shorty Where's my beer? Join Date: Oct 2004 Location: Glen Allen, VA Posts: 1,768	I have a header on my 250, but it has a floor shifter for the 3 spd. No clearance issues though. I does leak pretty bad at the head, I just haven't gotten around to changing the gasket (I hope that fixes it!). I don't know what kind of header it is, it came with the truck. __________________ 70 C10, shortstep, .30 over 250,Hurst shifted 3 spd parts hauler. Holley 390, Clifford Intake, Header, ported cylinder head, unknown bigger cam. 79 Corvette L82, 4 spd, black, red interior, headers, flowmasters, and unkown bigger cam. '03 Grand Cherokee Laredo, 4.0 4x4 daily driver. 165K miles, and runs great '08 Tahoe LTZ 4x4 155K

05-16-2005, 12:27 PM	#5
68w/sbc406 Got Light Emitting Diode? Join Date: Apr 2004 Location: Newberg, OR Posts: 2,485	i had a really bad exhaust leak at the head and ended up with 3 carb fires in one day. the first one i was able to put out with a 20 bottle of water. the second one was in a gas station but was able to suck all the flames into the carb when she fired. and the 3rd was put out by a nice man with a fire extinguisher let me be the first to say you might want to get that fixed before it gets worse __________________ 1968 1/2 ton 2wd lwb 6 lug disc and bags up front. Next c notch and rear bags '02 Chevy Silverado LT ext cab short bed 2WD 5/7 drop on 22's(the family car) 1993 Cherokee work ride/weekend wheeler

05-16-2005, 01:52 PM	#6
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Find Ed at www.Mothertruckers.net. Tell him you want the Dynomax headers for a 250 inline 6. Tell him you're a board member and that one of the other members sent you. His email is ed @ mothertruckers.net, I think, but phone is a lot quicker and easier than email. PS - I can take photos of the kit I got from him if you want to see pics before you buy. __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. Last edited by shifty; 05-16-2005 at 01:53 PM.

05-16-2005, 02:15 PM	#7
oj70chevy 250 V-6 Club Join Date: Feb 2005 Location: San antonio, TX. Posts: 898	Shifty, I would like to see some befor and after pic's when your done. This sounds like something I would like to do to my 70 c/10. __________________ 1970 Chevy C/10 6 Cyl. 43k original miles all factory .http://67-72chevytrucks.com/vboard/s...d.php?t=197523 Never ask a stupid question unless you want a stupid answer .

05-16-2005, 02:21 PM	#8
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	I'm waiting on header paint/coating from Eastwood. I don't like the look of black headers. I'll surely be taking pictures __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

05-16-2005, 07:16 PM	#10
dtlilly Account Suspended Join Date: Jan 2003 Location: Shadow of Lambeau Field Posts: 5,597	You can also buy a high performance intake for these trucks that will let you run a 2 BBL carb. Combined with the header, the 250 will become alive and sound real "throaty"! A friend in Memphis had that set up on his 68.

05-16-2005, 09:25 PM	#11
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Left the camera at the office. I gotta go in for surgery tomorrow, so I won't get the camera again until ... shoot, until I get to work on Wednesday __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

05-16-2005, 10:08 PM	#12
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 46,754	I have a set from Clifford for my 250, not sure if they make them or they are made by someone else to sell with the Clifford name. Couple of things. Make sure you replace the front and rear manifold nubs with threaded studs. That tends to help with leakage that may occur over time. Also note, if this is a daily driver, you will loose the heat source for the bottom of you intake. This means it may be a bit more cantankerous on first start and take a while longer to melllow/stabilize the enging until it warms up. The aftermarket intake manifolds normally have a water source flowing through them and uses the engine water/coolant as the intake heat source. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

05-16-2005, 10:12 PM	#14
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 46,754	The listed the bolts seperate on mine, so........ they git you for more. Again remeber to get new studs for the head. The come in kits in Auto Zone and other like stores. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

05-16-2005, 10:13 PM	#15
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	My current header setup is using bolts, not studs __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

05-16-2005, 10:49 PM	#16
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 46,754	Bolts will works, studs make it easier to mount. Mainly replace the two end unbs with a stud (or a bolt) so you can tighten the ends down. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

05-16-2005, 10:58 PM	#17
moodybo Registered User Join Date: Oct 2004 Location: Oklahoma Posts: 261	The headers that lmc sells are heddman. I bought a set from a local speed shop. i had a floor shifter in so clearance was not an issue. I was not satisfied with the low clearance of the collectors. They hung down way too low for me! As for power increase it was a big differance!my 2 cents



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05-17-2005, 01:19 AM	#18
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,369	I had a set of Clifford headers and a Clifford intake manifold with a small four-barrel Holley carburetor on a 250 about 10 years ago. It performed pretty well for a 250. I had a single sided 2.5" exhaust with a Flowmaster muffler. It had a nice throaty sound at idle, but had a way higher pitch than a V8 at higher RPMs. Here's the link to Clifford's website. It's not cheap stuff, but it is high quality. http://cliffordperformance.net/Merch...egory_Code=C21

Register or Log In To remove these advertisements.