thermoquad manifold, do i need these ?

-
P

purplescamper

Well-Known Member
Joined
Jul 31, 2012
Messages
290
Reaction score
6
Location
scotrun pa.
I have a stock spread bore thermoquad intake manifold on my 360, looking inside my manifold I notice I have whats called egr floor jets inside my manifold. since I'm not running egr stuff in my engine do I need these ?
 
you don´t need these floor jets,,, some people do block them ...with NPT plugs ... ( IF I would prefer to weld them ) because IF a plug is going loose.... the eingine is gone

Greetings Juergen
 
Some guys block the passages at the head with thin stainless steel instead.
Some guys weld or braze the bungs closed.
Whatever you choose make sure the things don't leave home, cuz it will get real expensive, real quick.
 
Unless you can make the intake floor perfectly FLAT, there is zero need to change it. That intake flows almost as much as the 71 and 72 intakes. There is really no need to change it. You could end up doing more harm than good.
 
Last edited:
No those are not needed per say. I've heard of people milling them out for more plenum volume. I've never used one on any engine of mine so I wouldn't know how they would perform before you milled it vs after.
 
purplescamper said:
I have a stock spread bore thermoquad intake manifold on my 360, looking inside my manifold I notice I have whats called egr floor jets inside my manifold. since I'm not running egr stuff in my engine do I need these ?
Click to expand...
hi, drill and tap for allen pipe plug. use Loctite. they will stay in. I did my 340 intake this way. as for flow, the71 n 72 without egr, was .05 faster over the 73 intake with egr mounds .just food for thought.
 
perfacar said:
hi, drill and tap for allen pipe plug. use Loctite. they will stay in. I did my 340 intake this way. as for flow, the71 n 72 without egr, was .05 faster over the 73 intake with egr mounds .just food for thought.
Click to expand...
Maybe I'm wrong... I must be thinking of something else. Sorry!
 
purplescamper said:
I have a stock spread bore thermoquad intake manifold on my 360, looking inside my manifold I notice I have whats called egr floor jets inside my manifold. since I'm not running egr stuff in my engine do I need these ?
Click to expand...
blocking intake exhaust will not affect egr. system, is has it's own passage. it comes out next to carb base. which is a huge vac leak!!!! block it down in the floor of manifold. then have no problem with vac leaks .
 
Are you referring to these holes inside? I'm curious about them too. Where do they go?
RustyRatRod - are you saying they can just be left alone?
a.jpg
 
Leave them alone. The only thing you need plugged is the outside flange where the EGR bolts on. Trying to plug two holes in the bottom of the intake that you can hardly get to is stupid. Plug it where it's easily accessible. On the outside of the intake at the EGR flange. Just make a plate the same shape as the flange, drill the bolt holes in it, use a gasket or high temp RTV and bolt the plate on. Done.

I don't know why in the hell so many people turn things into such a complicated task when the easy approach always works. It's your intake. Do it like you want.
 
Last edited:
perfacar said:
they need to be plugged. they go out to the egr valve, which sits next to carb flange. will cause a huge vacuum leak.
Click to expand...
the reason, I plugged them was to keep raw fuel from accumulating down in the egr passage!! open holes will let fuel get down in there. I figured , that's not very bright to allow that!
 
You must log in or register to reply here.
-

Back
Top