Sealing bypass pipe in BB intake manifold

[Mark G.]

I have to install the bypass pipe on the front of my 427 intake manifold. What should I use to seal it with? anerobic sealer? Silcone? Or (gasp) j b weld?
Mark

[Stuart F.]

Re: Sealing bypass pipe in BB intake manifold

Mark;

I'm sure you would get some responses if you would better describe what bypass pipe you are referring to, I.e. Perhaps the heater hose type pipe nipple from the water manifold portion of the intake manifold to the water pump.

Stu Fox

[Joe L.]

Re: Sealing bypass pipe in BB intake manifold

I have to install the bypass pipe on the front of my 427 intake manifold. What should I use to seal it with? anerobic sealer? Silcone? Or (gasp) j b weld?
Mark

Mark------


I'm pretty sure that your application uses the absolutely miserable pressed-in type fitting. If so, I'm surprised you were able to get the old one out. Theoretically, you don't need to use any sealer with this type of fitting. However, if it were me, I'd probably use green Lock-Tite. This will make it virtually impossible to ever remove the fitting in the future but it will assure a seal and you'll probably never need to remove the fitting again, anyway. You DEFINITELY don't want to use JB Weld, though, unless the orifice in the manifold is in really bad shape.

It would be nice to convert this fitting to the threaded type. However, I don't think the manifold has enough material in this area to allow this. Later manifolds originally using the threaded type fittings have more material in this area for that purpose.

If it were me, I'd want to use a STAINLESS STEEL fitting. However, I don't know of one that is available for the pressed-in type fittings.

[Mark G.]

Re: Sealing bypass pipe in BB intake manifold

Thanks for the replies. The manifold is a 67 435. The fitting is the one that faces forward for the water pump bypass hose. Yes, it is the pressed in fitting. I bought the manifold without the fitting installed. I thought of using a 1/2 npt tap, but that would destroy the value of the manifold. I have a fitting coming and will have to see how tightly if fits into the hole.

Joe, green Loctie would be a better choice than anerobic sealer? I have both.

[Stuart F.]

Re: Sealing bypass pipe in BB intake manifold

Mark;

Glad you got a good reply from Joe.

StuFox

[Joe L.]

Re: Sealing bypass pipe in BB intake manifold

Thanks for the replies. The manifold is a 67 435. The fitting is the one that faces forward for the water pump bypass hose. Yes, it is the pressed in fitting. I bought the manifold without the fitting installed. I thought of using a 1/2 npt tap, but that would destroy the value of the manifold. I have a fitting coming and will have to see how tightly if fits into the hole.

Joe, green Loctie would be a better choice than anerobic sealer? I have both.

Mike------

Green Locktite (actually a Permatex product) is an anaerobic sealer. The advantage of using it is that it's designed for interference fit applications and it will wick in. However, you can use what you have. It should work fine.

You should find that the fitting will be a very tight interference fit. If it fits at all loosely, the manifold orifice is damaged or worn. If that occurs, then I'd definitely use the green locktite but I'm not sure that even that will work to adequately seal.