BBC how long to run hot?
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BBC how long to run hot?

  1. #1
    Member hollbrow's Avatar
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    Default BBC how long to run hot?

    As in, how long would it take a big block- cranked up from stone cold with NO cooling water to get hot enough to hurt anything at idle? I have always assumed that around 1 minute or so would not hurt anything. Anybody have any different knowledge/experiences? I have always pulled my driveline and run it on the trailer for a minute or so after I get it home to try and dry the headers. I seem to have a problem with moisture and my valves/rotating assembly getting stuck when I store it away. I even fogged it with WD-40 when I put it away a few years ago- and it still stuck- to the point I'm having problems getting it straightened out. Wondering if I could have hurt something trying to 'dry it out'.

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  3. #2
    Senior Member Mash on It's Avatar
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    +1 for unhooking the driveline
    derby cars run fur 45 to 60 mins. with little to no coolant, 2-5 mins should be OK, exhaust hoses (thru transom exh.) get pretty hot pretty quick.

    Daniel
    Mash on it

  4. #3
    Member hollbrow's Avatar
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    Default hot

    Thanks- I always have figured a min or two at no load would probably be ok- just looking for a consensus.

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by hollbrow View Post
    Thanks- I always have figured a min or two at no load would probably be ok- just looking for a consensus.
    Lite it for a few , you'll be fine , very long and yes it will get hot and with thru hulls it will start to affect the Exaust hose , with headers the'll get hot enough to raise a welt !

  7. #5
    Member hollbrow's Avatar
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    Default heads...

    The thru hull exhaust does seem to be the limiting factor within a min or two. Most specifically, I was concerned about heads/valves/guides as I am trying to sort a valvetrain issue with lifter noise after a stuck valve- apparently from sitting up for a long while. Im just looking at everything I have done in a critical light to solve my issue. Thanks.

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    Just Me snoc653's Avatar
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    Just a thought. Are you putting air tight covers over the exhaust after you shut it off? With the GA humidity, it is highly possible that air coming in past the flappers is creating condensation inside the exhaust. It doesn't have to be anything fancy, zip lock bags and rubber bands would work after the exhaust cools down.
    So many projects, so little time

  9. #7
    Member hollbrow's Avatar
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    Default exhaust open

    For much of the time it was stored, the exhaust was open. It has 4" square cut stainless tips with the external rubber flappers but they dont seal completely. It was stored under a covered garage under a tarp, but open to ambient air. Yes, its very humid here. I'm sure I had a bit of surface rust in the cylinders after that long, but tearing it down to see wasn't a pleasant option- so I hit it with penetrating oil and fired it off. Have had trouble ever since. A leakdown shows I still 'have an engine' so to speak if I can get the valvetrain straightened out. I bought a couple of those little nerf footballs to cram in the tips to keep the pipes dry now.

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