Hi,
I need some advice please, I have a 350 SBC ZZ4 engine in my 1931 Model A, it has the aluminium adaptor plates fitted to enable the fitment of the standard type sbc valve covers instead of the centre bolt type, they have a rubber O ring which seals against the head face and they are leaking , I cannot find a supplier here in the UK for the O rings and wondered what you guys use, ie can I silicon the adaptor to head face.