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

VanceH · 06-30-2009, 11:09 PM

Stock Rams horns off a SB 283, cleaned up and ready to put on Sb 350. On the bottom where the Pipe goes there is some small spacers with a flapper inside. These are about an inch long. I have some pics and will upload first thing in the morning. Question is do i need them? can i remove them?

Thanks
Vance

JimKshortstep4x4 · 07-01-2009, 03:47 AM

The spring loaded valves were installed to help the engine warm up faster and force exhaust to circulate through the intake manifold.

They can cause problems if they rust up in the closed position and they restrict the flow of exhaust. Also, they can rattle and leak exhaust around the shafts.

They don't seem to make a difference in the cold operation of engines so we don't run them on our trucks.

Jim

VanceH · 07-01-2009, 09:26 AM

Cool i dont think the one side will stick shut as its not even there. SO what do you replace them with or do you just shorten the studs and go right to the exhaust pipe.

Here are some pics

thanks

neonlarry · 07-01-2009, 05:03 PM

There are several places that make a plain spacer to replace the flapper one. I got one from Ecklers, or try some of the board vendors they might have them.

VanceH · 07-01-2009, 05:06 PM

can you just remove them??

neonlarry · 07-01-2009, 05:12 PM

Sure if your exhaust pipes will pull up that far. I Just had one on the D\S and with an H-pipe connecting both sides together that was not an option.

06-30-2009, 11:09 PM	#1
VanceH Loving the Jimmster Join Date: Jun 2008 Location: Emmett, idaho Posts: 575	Exhaust Manifold question Stock Rams horns off a SB 283, cleaned up and ready to put on Sb 350. On the bottom where the Pipe goes there is some small spacers with a flapper inside. These are about an inch long. I have some pics and will upload first thing in the morning. Question is do i need them? can i remove them? Thanks Vance

07-01-2009, 03:47 AM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: Exhaust Manifold question The spring loaded valves were installed to help the engine warm up faster and force exhaust to circulate through the intake manifold. They can cause problems if they rust up in the closed position and they restrict the flow of exhaust. Also, they can rattle and leak exhaust around the shafts. They don't seem to make a difference in the cold operation of engines so we don't run them on our trucks. Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

07-01-2009, 09:26 AM	#3
VanceH Loving the Jimmster Join Date: Jun 2008 Location: Emmett, idaho Posts: 575	Re: Exhaust Manifold question Cool i dont think the one side will stick shut as its not even there. SO what do you replace them with or do you just shorten the studs and go right to the exhaust pipe. Here are some pics thanks Attached Images

07-01-2009, 05:03 PM	#4
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,746	Re: Exhaust Manifold question There are several places that make a plain spacer to replace the flapper one. I got one from Ecklers, or try some of the board vendors they might have them. __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI

07-01-2009, 05:06 PM	#5
VanceH Loving the Jimmster Join Date: Jun 2008 Location: Emmett, idaho Posts: 575	Re: Exhaust Manifold question can you just remove them??

07-01-2009, 05:12 PM	#6
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,746	Re: Exhaust Manifold question Sure if your exhaust pipes will pull up that far. I Just had one on the D\S and with an H-pipe connecting both sides together that was not an option. __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI



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