Re: 4.3L Volvo torque specs and sequence for the exhaust manifolds and risers?
Torque on 3/8 diameter bolts should be about 30 to 35. No pattern needed, just be even with incremental steps to full torque. On those long riser bolts really careful use suggests letting them sit and unload their spring (a few minutes is fine)then checking torque again.<br /><br />Gasket on dry with all surfaces cleaned. That riser setup tends to have quite thin, and long, walls between the water and exhaust - be sure all surfaces are in good condition or don't bother mating them.<br /><br />Re-torque riser after it gets hot.<br /><br />Anti-seize on bolts is one of my personal pet peeves. Put it on the shaft so the bolts don't weld to the manifold or riser tunnels and I can see the point. Put it on the threads (where most folks will put it) and in my opinion you are asking for a leak due to bolt that won't hold its torque.<br /><br />Spray on face is an absolute requirement. Apply in liberal doses as often as possible until supply is gone.
<br /><br />Thanks!