Exhaust & cat sealant C3 and C4

[Frank K.]

Did GM use a gasket or sealant when installing a new car exhaust system? Are replacement pipes and mufflers a advantage to use a sealer and what type?

[Terry M.]

Re: Exhaust & cat sealant C3 and C4

Did GM use a gasket or sealant when installing a new car exhaust system? Are replacement pipes and mufflers a advantage to use a sealer and what type?

You didn't mention the year C3 you are interested in, but your reference to a cat (I presume not a feline) would indicate a later C3.

Your AIM for whatever year you are interested in should show you if an exhaust pipe sealant was used. The sealant is called out in the 1968-72 AIMs and there was sealant present at the junction of the front to rear pipes on my 1970 when I first disassembled the system.

[Frank K.]

Re: Exhaust & cat sealant C3 and C4

I found the sealant at one place on the cross over but nothing else in the aims. Question? I did not know the c4 (93) had a aims

[Terry M.]

Re: Exhaust & cat sealant C3 and C4

I found the sealant at one place on the cross over but nothing else in the aims. Question? I did not know the c4 (93) had a aims

To my knowledge there are no AIMs as we know them from earlier Corvettes for C4s. There are, however, product description manuals. These are not sold to enthusiasts and I have no idea if they contain the information you are looking for.