I gotta motor noise...HELP...Please - The 1947 - Present Chevrolet & GMC Truck Message Board Network

784X4GUY · 12-17-2003, 07:55 AM

Alright yall,

My motor developed a popping noise around the number 7 cylinder. Thought it was a header gasket replaced it to no avail...So i thought my cam was going out so i replaced the cam,timing chain,lifters,pushrods,but left the stock rockers on it. Ive got the lifters adjusted right. I know its not that. But its still making that sound...Oh by the way as the motor is running it is popping and if you let it run long enough it will blow the gasket out at the number 7 cylinder. Oh if you hit the gas hard you can really hear the pop but if you ease the throttle to like 3000 or 3500 and hold it there the sound dies down a lil bit...please any help would be greatly appreciated...Oh also ive had the heads off and took them to a machinist and he pressure checked the valves to see if they were seating right and they were all perfect...he also checked for loose studs,broke springs and such but everything was good...please any help would be appreciated

TwinTurbo · 12-17-2003, 08:16 AM

What gasket are you blowing on the no 7?? The header gasket???? did you check for a warped flange???

784X4GUY · 12-17-2003, 08:32 AM

I blowing the header flange gasket that goes between the header and the cylinder head...no i sure havent checked for a warped flange...Im just wondering why it makes that sound even when its got a brand new gasket in there

TwinTurbo · 12-17-2003, 08:38 AM

If your header flange is warped it'll leak and sound like a can full of marbles rattling away

12-17-2003, 07:55 AM	#1
784X4GUY Did someone say MUD? Join Date: Aug 2003 Location: Pullman,WA Posts: 1,089	I gotta motor noise...HELP...Please Alright yall, My motor developed a popping noise around the number 7 cylinder. Thought it was a header gasket replaced it to no avail...So i thought my cam was going out so i replaced the cam,timing chain,lifters,pushrods,but left the stock rockers on it. Ive got the lifters adjusted right. I know its not that. But its still making that sound...Oh by the way as the motor is running it is popping and if you let it run long enough it will blow the gasket out at the number 7 cylinder. Oh if you hit the gas hard you can really hear the pop but if you ease the throttle to like 3000 or 3500 and hold it there the sound dies down a lil bit...please any help would be greatly appreciated...Oh also ive had the heads off and took them to a machinist and he pressure checked the valves to see if they were seating right and they were all perfect...he also checked for loose studs,broke springs and such but everything was good...please any help would be appreciated __________________ Im in the market guys...so keep ya eyes peeled -------------------- Mini trucks are for guys who cant get it up! Last edited by 784X4GUY; 12-17-2003 at 07:59 AM.

12-17-2003, 08:32 AM	#3
784X4GUY Did someone say MUD? Join Date: Aug 2003 Location: Pullman,WA Posts: 1,089	I blowing the header flange gasket that goes between the header and the cylinder head...no i sure havent checked for a warped flange...Im just wondering why it makes that sound even when its got a brand new gasket in there __________________ Im in the market guys...so keep ya eyes peeled -------------------- Mini trucks are for guys who cant get it up!

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12-17-2003, 08:16 AM	#2
TwinTurbo Registered User Join Date: Sep 2003 Location: The Netherlands Posts: 994	What gasket are you blowing on the no 7?? The header gasket???? did you check for a warped flange???

12-17-2003, 08:38 AM	#4
TwinTurbo Registered User Join Date: Sep 2003 Location: The Netherlands Posts: 994	If your header flange is warped it'll leak and sound like a can full of marbles rattling away



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