Torque Bolt Question

[Larry S.]

I am replacing the exhaust system on my 66 427-450 car and am wondering what torque spec to use for the 3 manifold to exhaust pipe bolts ( 3 on either side of engine)?I cant seem to find it in any of my current information.

[Pete L.]

Re: Torque Bolt Question

Larry,
Torque should be 13-17 Lbs-ft

[Carl N.]

Re: Torque Bolt Question

I always go back and re-torque after several starts then again in about 6 months - the heat can effect these fastners

[Michael G.]

Re: Torque Bolt Question

Well, not really the fasteners, but certainly the parts they're attaching...

[Joe L.]

Re: Torque Bolt Question

Well, not really the fasteners, but certainly the parts they're attaching...

Michael------


Yes, the heat and compression definitely affects the exhaust packings. However, there's a way around this-----use sintered iron rings instead of the packings. These are all I use. They're essentially "immortal" and pretty much eliminate the need for repeated re-torquing of the flange nuts.

2" = GM #3731062

2-1/2"= GM #3768711

Are the above original for Corvette? Only if you have a 1975-81. But, they work very well for all earlier.

[Gary B.]

Re: Torque Bolt Question

Michael------


Yes, the heat and compression definitely affects the exhaust packings. However, there's a way around this-----use sintered iron rings instead of the packings. These are all I use. They're essentially "immortal" and pretty much eliminate the need for repeated re-torquing of the flange nuts.

2" = GM #3731062

2-1/2"= GM #3768711

Are the above original for Corvette? Only if you have a 1975-81. But, they work very well for all earlier.

Does anyone know if Fel-Pro# 60985 is sintered and is that item the 2" size?

Gary

[Joe L.]

Re: Torque Bolt Question

Does anyone know if Fel-Pro# 60985 is sintered and is that item the 2" size?

Gary

Gary-----


I believe it is sintered iron but I'm not 100% sure. It is for 2" exhaust.

[Larry S.]

Re: Torque Bolt Question

Thanks for all that good information. It really helps.