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Author Topic:   number 4 header tube glowing
posted August 08, 2004 09:24 AM           
guys i need advice or help nut it sounded like we dropped a valve in the number 4 cylinder but we pulled head and found nothing yet we havent pulled springs off yet either.

But what would the header glowing red on THAT CYLINDER ONLY be a sign of? it was only glowin right at the bend right at the head itself

posted August 08, 2004 09:41 AM
exaust valve is where your problem would be

posted August 09, 2004 01:36 PM
timing or fuel mixture. Because it's only that cylinder i'd blame the timing. Make sure the cap tower hasn't shifted.

posted August 09, 2004 03:54 PM
I'm with the timing. Double check your firing order on the distributor cap! Having 2 wires switched will do it, and we have all made dumb mistakes. How does the plug from that cylinder look compared to the rest?

posted August 09, 2004 05:36 PM
look at the intake gasket and make sure it's not pulling air. you could be leaning the one cyl. from a leaking gasket.

posted August 11, 2004 07:39 PM
something with the timing more then likely

posted August 12, 2004 01:01 AM
I have seen where one bank got red but for one cylinder alone is a new one to me. Please bear with me through my thought process, I know it will surprise my ex wife to know that I have one, lol. I would assume that for it to be isolated to one cylinder would indicate a condition that only exists in that cylinder. You said that you pulled the heads and found no explanation as far as valves etc., I would be curious as to valve springs on that cylinder though, also curious to the history of the engine, was it new or have some races on it? If you ran it before with no problems what has been changed from previously? To me it would seem that timing would effect all cylinders pretty much equally. Also considering that 3 and 5 are the worst on small blocks from what I know. (which isn't much) Could a vacuum leak appear and effect only one cylinder if it was on the intake runner for example? Possibly a cracked cap? Sorry I have no answers but was hoping to help by asking questions anyway. Please let us know what you find. good luck.

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