1988 RT with 92,000 miles on the clock. Stripped out the fuel injection side this morning looking for air leaks. ( it runs like a three legged dog at low speed) Of the four inlet manifolds, number 4 the rear one is in pristine condition the other three, the rubber is breaking away from the aluminium body around the allen screw holes, However the rubber manifolds themselves where the throttle bodies clamp too are all in good condition and still flexible. Before stripping I had assumed there would be a loose 'O' ring creating the seal between manifold and head but it looks like its all part of the rubber moulding. As they are £31 each, do I replace them or will some gasket goo give me a good seal? All other rubber parts are in good nick. John

Permatex RTV red will do the job or the usual 3bond let it cure for 24 hours before you run it.

same as what i found john

by sealing up the face between the head and the rubbers i got a good reliable idle ...

you might notice a notch of rubber at one end of the rubbers that looks as though it might make the rubber sit high on the face  just there ,,,i cut mine off flush ...just in case ...

good luck

Yes Charlie its odd but three of them did have a raised piece of rubber at one end, yes have cut them off, must be a fault in the mould when they were made. My next problem is the RTV sealant. Can't seem to find either Permatex or threebond in the UK. Any one know of a UK equivalent that is petrol resistant? Have found a number of RTV sealants but not suitable for contact with fuel.  John

Motobins got threebonds..............but it's used as a metal to metal sealant.

I'll guess you could find something you could use among these:

http://www.ebay.co.uk/bhp/high-temperature-gasket-sealant