Thank you Mike. I will check again.
My only experience of this is when the top flanges of the exhaust do not marry up perfectly with the engine and do not make a gas tight seal. The flanges are sturdy and may not pull up if the exhaust is poorly formed.
If this is the case the gaskets will show witness marks where the exhaust gases have been escaping. This poor joint will cause popping on lift off.
I used double gaskets in the hope of avoiding this issue. Interesting whoever fitted the previously exhaust also used double gaskets. I believe this was Larry Markham who has forgotten more about 356s then I know
I did do a quick check before putting it all back together but will check again. I sprayed wd 40 around the joints to see if it interacted with any escaping gases but will do the spray check for a an increased idle too. I believe that Mike Smith also recommended blocking the exhausting and listening too!
"Leaks can also occur at the other end of the exhaust system when these clamps do not nip up well enough."
I had so much trouble getting the old pipes I had to hit the exhaust with a large rubber hammer. When that didn't work I had to heat the joint and hit harder with the hammer not leaving the old exhaust in a good way. I'm hoping too avoid having to do that.
“A REMINDER. I would be grateful if those members who have borrowed bits from me in emergencies (e.g starter motor, oil cooler, etc) would return them and/or contact me”. – Chris Turner RIP
