I think the ‘pop’ rivit is a factory fitting.
However sure it will be confirmed by others.
Cylinder head rivet
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rpb203
- 1275 Cooper S
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CMC
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Re: Cylinder head rivet
The pop rivet was indeed factory fitted from approx. '88. I always assumed to distinguish heads suitable for unleaded fuel.
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Spider
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Re: Cylinder head rivet
They used the rivet in the head and also on the blocks, for the Oil Pressure Relief Valve Vent drilling on the front of the blocks from about 85-ish. It was just a cost cutting measure, it can be replaced with the original Brass Plugs, though I tap them for screwed plugs.
(The unleaded heads did appear until 89 or 90).
(The unleaded heads did appear until 89 or 90).
