What's new
CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.

performer intake

carolinafan4life63

carolinafan4life63

1/2 ton status
Joined
Oct 13, 2008
Posts
481
Reaction score
0
Location
south carolina
any one happen to know what the two hole are for in the intake runners right below where the carb mounts? i dont ever recall seeing this on any other intake and it looks as if they were drilled ! will it hurt to run it like this or do i need to try and patch them ....if so , with what?:doah:

S7300435.jpg
 
wow...that doesnt seem right at all....isnt that coolant a coolant path that its drilled into? or into the lifter valley?
 
by shining a flashlight into the center coolaant runners i cant see any light coming through the drilled holes.....i'm at a loss , i have never seen this done before...just curious if anyone else has ........i dont want to install it and end up taking it right back off
 
ok so i took the intake out to the shop anb used my air compressor to blow air through the two holes and the air exits where the egr port is !! i am going to use a block off plate since i dont have an egr valve .......will it harm anything to run it like this or should i try and plug the two holes? maybe tap them and thread a short bolt in them with locktite? any ideas?
 
I'm thinking somebody was trying to get around smog issues.

Yeah, I like the idea of tapping and plugging with threadlocker; any chance of manifold leakage would, as it were, suck.

-- A
 
Do it with bolts. They would only create a tiny bit of turbulance in the air flow witch may just help atomize the air feul mix.

Only 2 reasons I can think of as to why they did this. Emissions or trying to warm the carb up faster in a very cold climate.
 
Can you get to the holes from the underside? If so I would scew a bolt in that way and then cut it off from the inside.
 
Look to me like the EGR feed holes. Looking at the EGR pad (never really looked at Chev EGR setups closely) is the "feed" portion (what feeds those holes) where the EGR mounts seperated by a cast aluminum "wall"?

Basically, you need to make sure that if you run a blockoff plate, the EGR feed passageway (the center crossover in the intake) is no longer allowing that crossover to feed those holes.

Buddy put a blockoff plate on his chev motor at one time, ran like crud. Put an EGR back on, but didn't hook it up, problem solved.
 
You can get a plug at the hardware store ... it'll be like the body of a bolt, but with an allen (hex) drive in the center. After you tap the holes (and blow them out real well with the air compressor!) you goop the plug with loctite and thread it in with an allen wrench.

Voila, no protruding head, but still removable down the line if you want.

-- A
 
ok here is another pic , the egr mounting pad is on the left( correct)? and the midle opening in the center is for a manual choke ? (correct)? when i use the air nozzle to blow air through the drilled holes shown in the first pic i posted , the air comes out of the openings on the left of the in take, so if i use a block of plate for the egr and the manual choke , would it be necessary to plug the drilled holes beneath the carb or not? i am running a q-jet with an electric choke. thanks , sorry if i am irritating you guys but i personally have never seen this before and dont want to do any unnecessary instalation and removal of the intake>

S7300438.jpg
 
id plug the holes by tapping and threading in a pipe plug and id run and egr block off plate as well.
 
You need to plug the holes. That cavity would fill with fuel otherwise.

Disturbance of flow really isn't going to make much of a difference unless you race, but you really have to make sure you lock whatever in that you use. Lost a head on my Oldsmobile plugging those type holes, when the bolt came out and wedged in the valve opening.

EGR is left in your pic. Looks like you can run a flat plate and be done with it. Of course verify, but that's how those types operate...one orifice is the EGR feed from the exhaust, one is the feed to the intake.
 
I cannot imagine for the life of me what drilling those holes would do in a positive manner. With their current location any time the engine is running exaust would be blowing straight up into the primaries of a carb. Talk about screwed up air flow.

I have the non-egr version of that manifold and the orifice on the right was for a "hot air" choke. It too plumbs directly into the exaust path.
 
I don't think that's right.

EGR valve blocks the exhaust gases from getting to those ports, UNTIL the valve opens, which clears the path from the exhaust to the intake. Otherwise you have a gigantic vacuum leak that is pulling in non-combustible "air".

Where else could EGR be introduced to potentially get the most diluted/spread between the cylinders but the floor of the intake beneath the carb?
 
The best way to fix the holes would be to weld them. But if that is not an option.
I would just JB weld the holes. There is no way I would thread a bolt on the inside of the intake that had even a remote a chance of making its way into my cylinders. There is a well known law called "murphys law" that covers things like that.
The JB weld will hold just fine if you push it thru the holes down into the passage below.
 
You must log in or register to reply here.

Latest Posts

Top Bottom