C2 Intake Replacement

[Ralph E.]

I pulled my intake off of my 327/300HP back in December. I would really like to begin my re-install. The weather has been cold here in Connecticut. I'm working in my garage. The temperature is usually about 45F. Any thoughts about using RTV and re-installing the manifold under these conditions.

[Christopher R.]

Re: C2 Intake Replacement

Look on the back of the tube. It should tell you the temperature range in which it should or shouldn't be used. I would be very surprised if you can't use it in 45F temperatures.

[Ralph E.]

Re: C2 Intake Replacement

Ultra Copper is good for temperature range -75F to 700F but it doesn't say the suggested application temperatures. I took the next step. I called Permatex. Per Permatex tech support "temperature will NOT effect the RTV, but relative humidity has the most effect on the silicone sealants". They recommended putting a bead down, put the pieces together, within 20 minutes, finger tightened snug, do not press out the sealant, wait five hours and tourque.
Anybody have any thoughts.

[John H.]

Re: C2 Intake Replacement

I've used the Ultra-Copper for years - usually apply it, let it sit for about 5 minutes, then install the intake and torque it down, then "dress" the exposed area with a wet finger to remove the excess. Even more important is to thoroughly clean the front and rear bare metal surfaces on the block AND on the bottom of the intake with lacquer thinner to ensure a good bond. I've NEVER had a leaker - can't stand oil leaks. Also be sure to use a thread sealer on the intake bolts, as all but the four corner bolts protrude into the lifter valley and if not sealed, hot oil will migrate up through the threads and show as seepage/staining on the intake under the bolt heads.