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post #1 of 8 (permalink) Old 03-30-2014, 05:10 PM Thread Starter
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Default Aluminium Black Bolts?

Hi guys, I can't remember if this was answered on here before but can the alloy black bolts that they use to replace the ones in the cam covers and primary covers ok in the to of the heads? I know you can't use alloy bolts in brakes or suspension as they aren't as strong as steel but should they be ok here? I love the look but don't want them to brake if that is potentially going to happen. Thanks.
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post #2 of 8 (permalink) Old 03-30-2014, 05:26 PM
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You might find black allen bolts at the hardware store

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post #3 of 8 (permalink) Old 03-31-2014, 04:21 PM
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You might find black allen bolts at the hardware store
You don't want the black oxide socket headed caps screws found at the hardware stores unless you want rusty bolts in a week or so. Find ones painted or powder coated. Also most of the alloy socket heads are stronger than the standard steel bolts. You don't use them in certain applications because they are brittle in shear areas because of their high strength.
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post #4 of 8 (permalink) Old 03-31-2014, 05:24 PM Thread Starter
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I have the ones from ProBolt UK. They are aluminium. I have them in my bike already (as per the pics) but I just haven't run the bike yet. I just wanted to make sure it was ok before I took it for a run.

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post #5 of 8 (permalink) Old 03-31-2014, 05:41 PM
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I have the ones from ProBolt UK. They are aluminium. I have them in my bike already (as per the pics) but I just haven't run the bike yet. I just wanted to make sure it was ok before I took it for a run.
I wouldn't use those unless you know which type of alum it is. I would assume it is a 2024t? The t the type of hardening usually 4 or 6But I wouldn't use either one of those either way. I believe audi/Porsche had problems with using aluminum bolts with aluminum heads in one of their engines and the heads would snap because of the expansion from the heat of the motor. Their are some type that probably would fit the bill but I don't have enough experience with the aircraft industry to tell you what type but I could find out.
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post #6 of 8 (permalink) Old 03-31-2014, 06:01 PM
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There not aluminum bolts on your rocker covers. There steel.
Aluminum would strech when it gets hot and not seal. There silver in color only

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post #7 of 8 (permalink) Old 03-31-2014, 06:20 PM Thread Starter
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The ones in the photo are aluminum. I put them in. Should I take them out and put the steel ones back in and paint the ends?

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post #8 of 8 (permalink) Old 03-31-2014, 06:28 PM
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The ones in the photo are aluminum. I put them in. Should I take them out and put the steel ones back in and paint the ends?
I would use high heat paint and primer and use a scotch brite to rough up the heads. Also use some antiseize on the threads and try to find the zinc plated ones. The black oxides are usually covered in oil so you would have to clean them first. The steel ones as you call them are an alloy. If the are metric which I assume they are they will have a grade stamped on top of the head. Most are a 12.9 some are 8.8. If they are 8.8 you may be able to get away with the aluminum but again without knowing the grade of aluminum I would change them.

Last edited by shanko; 03-31-2014 at 06:32 PM.
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