Mystery or normal occurance? - 460 Ford Forum
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post #1 of 10 (permalink) Old 04-03-2019, 01:34 AM Thread Starter
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Question Mystery or normal occurance?

I recently made an observation, for which I could find no explanation on the forum. The vehicle in question is a 1976 F-250 with an essentially stock 460 and C6 transmission with 61K original miles. While replacing the valve cover gaskets, I observed that two of the push rod holes in the passenger side head were filled with carbon. The two holes were the two nearest the center of the head (#2 exhaust & #3 intake). The carbon was "granular" or "gritty" and could be easily removed with a probe. All of the other 14 push rod holes were clean, as were the heads in general. As they were near the center of the head, my attention was directed to the heat riser passage (though the carbon did not occur in the driver side head). I'm wondering if this is a normal occurrence on the 460 or do I have a leak in the intake manifold gasket at the heat riser? I don't have a photo of the carbon filled push rod holes, but here you can see the heads. Thanks for any advice.
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post #2 of 10 (permalink) Old 04-03-2019, 09:25 AM
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I've seen that a lot on these as well as on big block Chevy engines. I don't think it generally hurts anything even though I've seen engines with the center of the pushrod turned blue and or polished.
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post #3 of 10 (permalink) Old 04-04-2019, 08:40 AM
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HI, Maybe the heat crossover in the intake is plugged causing excess heat at those locations
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post #4 of 10 (permalink) Old 04-04-2019, 10:51 AM Thread Starter
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Thanks for the responses, guys. My current plan is to do a compression check so I'll have a "base line" for this engine, and ultimately remove the intake manifold and do a bit of inspection and cleaning if needed. Someone suggested that since I live in a warm climate, plugging the heat riser passage might keep some of the heat away and stop the carbon from forming.
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post #5 of 10 (permalink) Old 04-04-2019, 11:09 AM
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carbon build up from intake gasket leaking, change gasket. this carbon is not good to run thru the eng,and it will find its way to the pan

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post #6 of 10 (permalink) Old 04-04-2019, 11:14 AM Thread Starter
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Quote:
Originally Posted by BOSS 429 View Post
carbon build up from intake gasket leaking, change gasket. this carbon is not good to run thru the eng,and it will find its way to the pan
Yes, that's what I was thinking. I would like to stop it from forming if possible.
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post #7 of 10 (permalink) Old 04-04-2019, 02:45 PM
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carbon build up from intake gasket leaking, change gasket. this carbon is not good to run thru the eng,and it will find its way to the pan
How could carbon build up inside of the pushrod holes in the head from an intake gasket leak? Nonsense. It happens because that area of the head gets hot enough to actually burn the oil...

I had a customer one time who had a 460 in a little dump truck. He said that it was bad about really cooking the intake so I blocked off the heat passage by putting the heads in the mill and machining a little step .125 deep around the opening. Then I took a piece of .125 steel and cut a little piece that would fit down into the step and then stuck it down using some high temp RTV. Worked great.
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post #8 of 10 (permalink) Old 04-04-2019, 03:33 PM
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How could carbon build up inside of the pushrod holes in the head from an intake gasket leak? Nonsense. It happens because that area of the head gets hot enough to actually burn the oil...

I had a customer one time who had a 460 in a little dump truck. He said that it was bad about really cooking the intake so I blocked off the heat passage by putting the heads in the mill and machining a little step .125 deep around the opening. Then I took a piece of .125 steel and cut a little piece that would fit down into the step and then stuck it down using some high temp RTV. Worked great.

Yup coked the oil. High heat area and or cheap oil / infrequent oil changes.


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post #9 of 10 (permalink) Old 04-04-2019, 08:53 PM
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[QUOTE=DaveMcLain;1662701]How could carbon build up inside of the pushrod holes in the head from an intake gasket leak? Nonsense. It happens because that area of the head gets hot enough to actually burn the oil...



when hot oil forms to sludge it basicly turns to .a hard carbon like fourm, this is seen more so with FE engines that the intake gasket leaks ehx more often , Im betting this is toward the center of the eng more then the ends,and the heat riser crossover at the gasket is prob leaking past some,making things worse




It happens because that area of the head gets hot enough to actually burn the oil.. (quote).< this is what I ment, but you take things way diff then most

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post #10 of 10 (permalink) Old 04-05-2019, 06:50 AM Thread Starter
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Quote:
Originally Posted by DaveMcLain View Post
How could carbon build up inside of the pushrod holes in the head from an intake gasket leak? Nonsense. It happens because that area of the head gets hot enough to actually burn the oil...
I'm wondering if the intake manifold gasket could leak only at the heat riser connection without leaking elsewhere, adding to the heat in that area?

I'm the second owner of this vehicle. The original owner put about 95% of the miles on it, so I don't really know the history too well. I believe he used Quaker State oil and changed it in a timely way. The rest of the engine that I have seen is "clean" as the photos show.
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