Water neck seal: Silicone or gasket, or both

[D-Day]

Thing of it is, it leaked 5 minutes after I put it on. The surface of the neck and the manifold are just too flat/smooth to make a seal; no grooves like with the stock/steel one (neck or manifold).

I didn't think to get an o-ring; perhaps I'll ask when I pick up my Holley choke cable tomorrow. If not, then I'll scratch up the water neck, and use the silicone and gasket.

[63 & 64 Bowties]

Originally Posted by wedgemon

I switched to an O-Ring style last year. No leaks at all.

- Dave

+2 they're great

Originally Posted by D-Day

I didn't think to get an o-ring; perhaps I'll ask when I pick up my Holley choke cable tomorrow. If not, then I'll scratch up the water neck, and use the silicone and gasket.

You can't just get an o-ring, the neck has to be designed for an o-ring. It needs the o-ring groove in it.