The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => A7 & A10 Engine => Topic started by: Lindsay S on 24.08. 2024 19:57
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My Golden Flash iron head has small holes in the top of each exhaust port where the pipes go; that could possibly be threaded. Has anybody come across this before, is it ‘factory’ or is it somebody’s modification to stop the headers from vibrating out? See attached picture.
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Looks like a mod to me. Probably to retain the pipes, wonder if it worked?
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i have seen them with springs attached to the exhausts
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Looks like a mod to me. Probably to retain the pipes, wonder if it worked?
Obviously not as the pipes aren't there, are they?.. ;)
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Rex *lol* *lol* *lol* *whistle*
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Maybe had pins or screws through into the pipes, to hold them in.
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G'day Lindsay.
I did that to my A7SS head to use a spring onto the pipes.
Cheers
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That certainly seems a possibility, either that or a grub screw. I have read that Siamese pipes can be a problem with regard to falling out, so maybe the previous owner of this head had those fitted to their bike.
I bought this head off eBay to replace the head on my engine which has a rather unfortunate crack from a valve seat to the spark plug hole!
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i put a tie bar and allen grub screw on mine
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I have the same holes in my A10 head, I always thought they were oil drain holes.
The head gasket and the block have holes in a similar position.
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raindodger you are looking at the wrong holes mate.
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Is raindodger a father?
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Yes, he is! But the eyesight is not what it was
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Lucky wifey then... "missed by that much!"
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Keep it clean, Lads.