exhaust restrictor tabs - The 1947 - Present Chevrolet & GMC Truck Message Board Network

veltex · 01-20-2004, 03:20 AM

Does anyone use those exhuast restrictor tabs that come with the fel pro intake set, is the point to keep the fuel cooler? does it take the truck longer to warm up?

68speedalert · 01-20-2004, 03:31 AM

I'm assuming you're speaking of the tabs in the middle of the gasket. They are to slow or restrict the exhuast flow under the carb, to warm it &/or allow the choke to get heated so it can open.

When the engine is cold, the heat riser closes. The engine starts and the exhaust is forced thru the intake to the other manifold. the tab should be placed on the OPPOSITE gasket compared to the heat riser.

Most have the riser on the R.S. manifold. 67-68s have them on the D.S. 72's have a restriction in the right pipe at the donut instead of a heat riser.

Longhorn Man · 01-20-2004, 08:08 AM

I've always been told to plug them off...but I have no heat riser at all.

68speedalert · 01-20-2004, 01:38 PM

you're right, longhorn man, if you have other-than-stock set up, it may work best. Especially if you going for high performance, with no regard for cold driveability, you want cold intake air.

It comes down to your choke set up. Manual choke or electric choke, it won't matter much. Divorced choke, (stock set-up), it will matter.

01-20-2004, 03:20 AM	#1
veltex Registered User Join Date: Oct 2003 Location: Idaho Posts: 257	exhaust restrictor tabs Does anyone use those exhuast restrictor tabs that come with the fel pro intake set, is the point to keep the fuel cooler? does it take the truck longer to warm up?

01-20-2004, 03:31 AM	#2
68speedalert Semi-Senior Member Join Date: Feb 2003 Location: Washington, MO Posts: 390	I'm assuming you're speaking of the tabs in the middle of the gasket. They are to slow or restrict the exhuast flow under the carb, to warm it &/or allow the choke to get heated so it can open. When the engine is cold, the heat riser closes. The engine starts and the exhaust is forced thru the intake to the other manifold. the tab should be placed on the OPPOSITE gasket compared to the heat riser. Most have the riser on the R.S. manifold. 67-68s have them on the D.S. 72's have a restriction in the right pipe at the donut instead of a heat riser. __________________ '68 50th Anniversery LWB Custom Fleetside, '77 305 v-8, turbo 350, factory speed alert (still works), '71 drivetrain w/front discs. Some call it ugly yellow, others call it Ochre '83 Jeep CJ-7, <80,000 miles, original owner '04 Chevy Suburban, 4x4, 2500, 6.0 ltr, Predator Diablo programmer '95 GMC K1500 Extended cab

01-20-2004, 01:38 PM	#4
68speedalert Semi-Senior Member Join Date: Feb 2003 Location: Washington, MO Posts: 390	you're right, longhorn man, if you have other-than-stock set up, it may work best. Especially if you going for high performance, with no regard for cold driveability, you want cold intake air. It comes down to your choke set up. Manual choke or electric choke, it won't matter much. Divorced choke, (stock set-up), it will matter. __________________ '68 50th Anniversery LWB Custom Fleetside, '77 305 v-8, turbo 350, factory speed alert (still works), '71 drivetrain w/front discs. Some call it ugly yellow, others call it Ochre '83 Jeep CJ-7, <80,000 miles, original owner '04 Chevy Suburban, 4x4, 2500, 6.0 ltr, Predator Diablo programmer '95 GMC K1500 Extended cab

01-20-2004, 08:08 AM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	I've always been told to plug them off...but I have no heat riser at all.



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