What bolt do I need to blank off the vacuum port on the rear of my intake manifold?

mrtask

mrtask

Well-Known Member
Hello P6 Brain Trust.
When I ran a NADA air filter set-up on my V8 I fitted a 'Banjo bolt' to take a vacuum signal from the threaded port on the top of the intake manifold, behind the carb tower. Now I just want to black that hole off with a shorter bolt. Can anybody tell me what thread that needs to be? Better yet, has anybody got the short stubby little bolt I need going spare? Happy to part with some folding.
 
Sounds like you need a servo pipe blanking plug. Have I got one? Probably. Would I sell it if I have? Most definitlely. Can I find it? Errr....Maybe.....
 
I don't know if it is the same size threaded hole as for the brake servo? My servo hose comes from the front of the manifold, I'm talking about another hole, also on the top, but behind the carb tower. I bow to your knowledge, as ever!
 
I think you'll find it's the same thread as the servo fitting, if you want to know for sure, remove the fitting at the rear, then remove the servo hose non return valve, and screw that into the hole at the back.
 
I imagine it is the same thread, for other applications where perhaps the brake servo was situated behind the V8. Landy and/or Rangey?
 
Yep, I reckon you're right, that's why the RV8 is so good for conversions, lots of variations so you could make it look like it's always been where you want to put it. I think it's also the same thread and plug that used to be screwed into the front of the manifold tower when the AED got thrown into the skip...

That looks like it, but I would imagine it's a UNC thread on the Rover as it goes into an ally manifold, but I couldn't be sure on that.
 
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