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07-23-2004, 01:11 PM
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#1 |
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Registered User
Join Date: Oct 2002
Location: Phoenix, Arizona
Posts: 4,703
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Intake Manifold Gasket Leak ?
Some of you may have read about my problems with oil in cyl. #4.
Quick review: Engine crate 350 ($1300 one) w/ est. 50,000 miles. Compression 150 psi all around Valve stem seals checked and good on cyl. #4 Truck runs fine with new spark plug. After 10-15 miles of driving the spark plug gets oil on it and doesnt fire correctly causing engine to run rough. Once oil is on the plug it still runs ok until 3000rom at which point it becomes rough. With a friend following me he can notice a small amount of smoke out of my tail pipe under heavy acceleration (the oil being burned). If I put in a new plug it runs fine again for awhile (10-15 miles). Also checked plug wire and even tried another one, distr. is new msd. I pull the intake off and there is a crack in the intake gasket at the bottom intake runner of cyl. #4. Its not a big crack but I noticed it right away (Ill post pics later). I am guessing this is how the oil is getting into the cyl. I plan to replace the gasket and try it out. Does this sound like a likely cause to you guys? If the intake gasket doesnt fix the problem then I will pull the head and replace the piston ring. I want a great quality intake gasket, can someone recommend one?
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* AVOID: LOPER'S PERMORANCE / LOPERSPEED.COM OF PHOENIX, AZ & COTTMAN TRANSMISSION * Last edited by PHOENIX; 07-23-2004 at 01:14 PM. |
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07-23-2004, 01:32 PM
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#2 |
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Slots go on anything!
Join Date: May 2003
Location: Richardson, TX
Posts: 5,957
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It wouldn't take a big crack in the gasket to pull oil out of the lifter valley. I would try the intake gasket before doing anything too major. Since you are right there, you are almost halfway done.
I would suggest just using FelPro or equivalent gaskets.
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1974 Jimmy- 5.3/4L80e/NP241 |
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07-23-2004, 04:42 PM
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#3 |
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Right turn Clyde
Join Date: Nov 2002
Location: Cincinnati, Ohio
Posts: 2,911
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What kind of Intake mainfold do you have?
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1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI |
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07-23-2004, 04:59 PM
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#4 |
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Registered User
Join Date: Oct 2002
Location: Phoenix, Arizona
Posts: 4,703
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Edelbrock aluminum performer. Not sure the part number, but I can find out.
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* AVOID: LOPER'S PERMORANCE / LOPERSPEED.COM OF PHOENIX, AZ & COTTMAN TRANSMISSION * |
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07-23-2004, 05:17 PM
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#5 |
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Slots go on anything!
Join Date: May 2003
Location: Richardson, TX
Posts: 5,957
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You might want to run a straightedge on the flanges of teh intake and heads to make sure that they are flat, too.
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1974 Jimmy- 5.3/4L80e/NP241 |
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07-23-2004, 05:21 PM
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#6 |
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Right turn Clyde
Join Date: Nov 2002
Location: Cincinnati, Ohio
Posts: 2,911
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Edelbrock recommends Fel-Pro Printoseal intake gaskets for there manifolds. Im searching for a part number now.
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1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI |
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07-23-2004, 05:21 PM
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#7 |
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Registered User
Join Date: Oct 2002
Location: Phoenix, Arizona
Posts: 4,703
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Good idea, I didnt think about doing that, but I will just to make sure they are straight and allow for a good seal.
I used the gasket that came with the kit. I am about to place an order with summit, filling cart now  .I need to know what size ports this motors heads have. Anyone know? I believe this is the head on my motor (goodwrench crate): Cylinder Heads- part # 14034808 casting #33417369 1.94" Intake valve , 1.50" Exhaust Valve 76cc Combustion Chamber
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* AVOID: LOPER'S PERMORANCE / LOPERSPEED.COM OF PHOENIX, AZ & COTTMAN TRANSMISSION * Last edited by PHOENIX; 07-23-2004 at 05:24 PM. |
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