Innes,
Not much good to you now as you seem to have your manifold leaks sorted out.
I have measured some spare manifold gaskets, as supplied for the twincam, at 1.1mm to 1.4mm depending on whom you buy them from. These gaskets have virtually no "give" in them and certainly would not allow for any irregularities in manifold flanges. However, manifold gaskets for 1600cc VW beetle, aircooled engines fit exactly. These are approx' 2.8mm thick, are comprised of three layers and have a crush ring in both sides. I fitted these on my Elan when fitting my, ill fitting, manifold and they are leak free three years later. I used no sealant.
Regards,
Colin.
P.S. Cost down here from an independant VW restorer? $2.50 each.
Yeah only used the silicone on the manifold flanges. Used some shims and a clamp for pipe joins on the other sections of the exhaust and so far is air tight.
DeanG wrote:Bolted a tubular exhaust up to my Elan in 1982. No issues, no sealant.
Maybe better build quality in the 80's?
Horns now work after I added a jumper wire across the steering flexible joint.
Next job is checking the reverse light switch works, getting closer and closer for an MOT.
Innes[/quote]