Can some one tell me what the hole inside the manifold are for. I have seen them with and without these holes? You can see them when looking straight down through the carb opening, they are about 1/2'' wide. Kinda like these.
CK5
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Intake manifold holes?
- Thread starter camok5
- Start date
possible for heat riser flow or egr stuff. never seen a gm with them.
01maroonz71
1/2 ton status
me either...the only thing i can think of is for is if under the manifold(between the block and manifold) there can be vaccuum nipples to run vac lines off of since i don't see really any up top.
There inside the manifold not under it (like in the pic) so I dont believe they would be vacuum ports. I pulled a GM edelbrock performer off the engine I'm building that had them. At first I though it was some kind of casting error but when I started looking online I found more pics of different manifolds with them. I'm still confussed as for what they are for and wouldnt fuel get trapped in there?
Oldsmobile used a setup like that, fed EGR through pipes screwed into the intake in about the spots in the picture.
Never heard of it on Chev motors though.
Never heard of it on Chev motors though.
Nothing attaches to them they are just holes that go into the bottom of the intake(not threaded) and I have never delt with them before but the manifold came off a chevy engine( not the same as the one in the pic, just using it because it shows the holes clearly).
This is one like the one I pulled off.
Someone on Pirate just told me that they are the blow holes for the EGR, is this true?
Russ
1/2 ton status
The edelbrock TBI manifold I put on my big block has those holes also. They go to the EGR.
Russ
Russ
Yeah, threaded.
probably EGR passages..
Mopar small blocks used similar holes with "floor jets" inside the intake to allow EGR gases to mix in with the fuel/air mixture to be re-burned..I'd guess the Edelbrock manifolds use a similar setup,going by your photos...
Mopar small blocks used similar holes with "floor jets" inside the intake to allow EGR gases to mix in with the fuel/air mixture to be re-burned..I'd guess the Edelbrock manifolds use a similar setup,going by your photos...
