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According to AKD3509 the tappet chest retaining bolts just had a washer behind the bolt head, should there have been a seal too?? It looks like later cars may of had what looks like a cup washer with a seal?? Gray

There is indeed a seal.

http://www.minispares.com/Product.aspx? ... 228&title=

Goes behind this:

http://www.minispares.com/Product.aspx?ty=pb&pid=34978

Yes, later cars with the convex tappet covers should have the cup and the rubber seal while earlier (concave) tappet chest covers were only fitted with a washer.
But you can fit the cup with the rubber seal to an early car and no one will notice. Don't forget, early covers need longer bolts and a dose of patience to keep the gaskets in place.

Thanks guys, I had some of the seals and cup washers in stock but was not sure if to use them or not but you say Ricardo who will notice!!