Is it essential to replace this when re-fitting the upper manifold? Also what is the hole for?
powey 106 GTI Feb 4, 2009 #1 Is it essential to replace this when re-fitting the upper manifold? Also what is the hole for?
mark123 172 race 250 meg mx5 Feb 4, 2009 #2 I've always reused mine without any problems. I think it is for breathing, to reduce the pressure inside the engine.
I've always reused mine without any problems. I think it is for breathing, to reduce the pressure inside the engine.