Burn on intake Manifold - The 1947 - Present Chevrolet & GMC Truck Message Board Network

skokie · 06-18-2005, 10:43 PM

I was checking the oil and I noticed this. Has anyone had this happen to them? Is this a exhaust leak? I checked the bolt and its good and tight. I also checked the wire and it is not touching the intake.

Sweet72 · 06-18-2005, 11:13 PM

That's where the exhaust crossover is on the intake. It could be a leaky intake gasket, but probably not, the exh. crossover area gets extremely hot, nearly as hot as your exhaust manifolds and will eventually burn off most engine paints.

OhioDan · 06-19-2005, 06:03 AM

Didn't they used to sell, or maybe they still do(?), sell intake manifold gasket sets with a steel blank to cover that hole? Thought I remembered seeing those a long time ago?
Or, is my OFS (Old Fart Syndrome) acting up again?

GMC AMI · 06-19-2005, 06:20 AM

Yup, they still have them!

midyearvet@aol. · 06-19-2005, 01:26 PM

Try Summit or another speed parts house.
Rick / Ca.

Green Machine · 06-19-2005, 02:10 PM

NAPA has them also, in any flavor you want, Victor gaskets I think. Don't know part numbers but they can find them. There is the completly open style, ones with a 1/2 inch restrictor plate, and complely blocked. In Cali, you may not need much heat under there, in colder areas some heat is desirable for cold operation, also if you have EGR to be emmisions legal you need to have some exhaust available under there. You can mix and match gaskets also. Fully open on both sides gives most heat,(and the most most burned paint) older SBC were that way. Your choke spring may be heated from this also. One combination that may work is to block the drivers side, and use the 1/2 restrictor on pass side to warm choke spring.

tmcgrawlookalike · 06-19-2005, 03:34 PM

felpro has them.they have it where you can partially block off the ports,or completely.if you look in the catalog,or on their computer,tell them it`s for a propane powered engine.they come blocked off completely.nothing at all/no hole/nada!!!i used to sell the sh%# out of these to racers that wanted a stock type gasket with that blocked off,and they are cheaper than mr.gasket,edelbrock,etc.....it`s also what i run on mine,and they do great.good luck!!

06-18-2005, 10:43 PM	#1
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,354	Burn on intake Manifold I was checking the oil and I noticed this. Has anyone had this happen to them? Is this a exhaust leak? I checked the bolt and its good and tight. I also checked the wire and it is not touching the intake. Attached Images __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234 Last edited by skokie; 06-18-2005 at 10:43 PM.

06-18-2005, 11:13 PM	#2
Sweet72 Registered User Join Date: Nov 2003 Location: Alexandria, VA Posts: 1,534	That's where the exhaust crossover is on the intake. It could be a leaky intake gasket, but probably not, the exh. crossover area gets extremely hot, nearly as hot as your exhaust manifolds and will eventually burn off most engine paints. __________________ '72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction.

06-19-2005, 06:03 AM	#3
OhioDan Registered User Join Date: Apr 2002 Location: New Carlisle, Ohio,USA Posts: 1,404	Didn't they used to sell, or maybe they still do(?), sell intake manifold gasket sets with a steel blank to cover that hole? Thought I remembered seeing those a long time ago? Or, is my OFS (Old Fart Syndrome) acting up again? __________________ LIFE AIN'T EASY WHEN YER FAT AND GREASY! GMC= Got More Class! 1970 GMC LWB, Fleetside, 350/4spd, Flowmaster "40's", 2002 GMC 16" Rallies, cowl hood,and added a bunch of options that weren't there when I started. Last edited by OhioDan; 06-19-2005 at 06:03 AM.

06-19-2005, 06:20 AM	#4
GMC AMI Registered User Join Date: Apr 2004 Location: The Other Maine! Posts: 2,236	Yup, they still have them! __________________ 1968 Chevy 4x4 307 4 speed

06-19-2005, 01:26 PM	#5
midyearvet@aol. Registered User Join Date: Jun 2003 Location: Napa, Ca. Posts: 103	Gaskets Try Summit or another speed parts house. Rick / Ca.

06-19-2005, 02:10 PM	#6
Green Machine Senior Member Join Date: Jul 2004 Location: Estherville, Iowa Posts: 3,371	NAPA has them also, in any flavor you want, Victor gaskets I think. Don't know part numbers but they can find them. There is the completly open style, ones with a 1/2 inch restrictor plate, and complely blocked. In Cali, you may not need much heat under there, in colder areas some heat is desirable for cold operation, also if you have EGR to be emmisions legal you need to have some exhaust available under there. You can mix and match gaskets also. Fully open on both sides gives most heat,(and the most most burned paint) older SBC were that way. Your choke spring may be heated from this also. One combination that may work is to block the drivers side, and use the 1/2 restrictor on pass side to warm choke spring. __________________ 1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0

06-19-2005, 03:34 PM	#7
tmcgrawlookalike Registered User Join Date: Jun 2004 Location: warr acres,oklahoma Posts: 650	felpro has them.they have it where you can partially block off the ports,or completely.if you look in the catalog,or on their computer,tell them it`s for a propane powered engine.they come blocked off completely.nothing at all/no hole/nada!!!i used to sell the sh%# out of these to racers that wanted a stock type gasket with that blocked off,and they are cheaper than mr.gasket,edelbrock,etc.....it`s also what i run on mine,and they do great.good luck!!



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