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477 gas engine questions

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Old 03-13-2007, 09:52 AM
fordpull fordpull is offline
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477 gas engine questions

I have a 477 gas engine IT backfires through valve cover 2 and4 cy have no builds upcompression is the intake or exhaust valves bent or sticking or cylinder damage compression builds up and blows the valve cover cap off any suggestions greatly app thanks
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Old 03-13-2007, 06:00 PM
HOTWRENCH HOTWRENCH is offline
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Sounds like you have a hole in a piston .

Good Luck ----------------Hotwrench
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Old 03-24-2007, 01:49 PM
85e150six4mtod 85e150six4mtod is offline
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You're going to have to pull the head at a minimum. Maybe that hole in the piston is brought on by a dropped valve.
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Old 08-31-2007, 03:09 AM
mchne33 mchne33 is offline
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blown pistons common to 477s?

hey are the 477 engines known to blow pistons? unrelated but important question: i have no crank for mine, is there any other cranks that share common main bearing spacings?
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Old 08-31-2007, 03:10 AM
mchne33 mchne33 is offline
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are 477s prone to blowing pistons?
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Old 08-31-2007, 03:14 AM
mchne33 mchne33 is offline
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hi fordpull -could it be really worn out/cracked valve guides?
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Old 09-01-2007, 08:23 PM
85e150six4mtod 85e150six4mtod is offline
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With an engine this old it could be anything. One thing it really is though is a teardown job. Until you pull it apart, it's all guesswork.

If you are hoping to pour a can of Motor Honey or something into it, you are dreaming. Get your tools or checkbook out.
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