h23 lower manifold question

[cb7h23]

i was working on cleaning/drilling my egr ports from my h23 untill i notice some holes on the top, inside the manifold .. just wanted too know is this normal ? or are the holes coming from the ports of the egr? or did i just screw up my manifold

.... ill try too post some pics asap... just need some answers ..

[GhostAccord]

Hard to answer without seeing what it is that you are referring to.

I am going to say that they are EGR ports, but that's going at it completely blind. There are 6 EGR ports on the top side of the lower manifold that require you to drill and tap them.

[cb7h23]

They look like vtec oil sqiurters but on the topside of the manifold ((looking from the part where the manifold meets the head)) ... im guessing it is the egr port? i just wanted to know if im doing the job right ... or did i go a lil too far with the drill?




this is not the manifold just showing an example of where the holes are theres 6 holes by the way... im trying to put everything back this week if anyone can help??

[Granite CB7]

Yeah, that's normal. All the exhaust gases flow through those 1/8" (or there abouts, from memory) holes, 1 hole for each runner. Then you have the other 2 which are where it branches off, then you should have a 7th on the end on the d/s by the BMC to get down the line w/ a bore brush or pipe cleaner. But obviously you do not want to make those small holes bigger, so do not drill too far down.

[cb7h23]

Thanks, i gratefully appreciate the info. I just finshed drilling/cleaning it and just cap them off with allen-head screw caps( looks oem) ...im also going 2 use bisimoto heat-shield gasket... hopefully the weather gets better this weekend .

[steelbluesleepR]

Thanks, i gratefully appreciate the info. I just finshed drilling/cleaning it and just cap them off with allen-head screw caps( looks oem) ...im also going 2 use bisimoto heat-shield gasket... hopefully the weather gets better this weekend .

I have one suggestion for you; use extended studs and make sure you re-install the block/manifold brace. when I installed my h23 manifold with the bisi gasket, the studs were BARELY long enough to fully engage with the nuts. I also forgot to reinstall the brace and about two months later the far passenger-side stud and corner of the intake manifold both broke off causing all the coolant to puke out on the road.

[Granite CB7]

^That is a great suggestion. I've seen you post this info afew times over the years and it's the reason why I always tell people to run the brace! I've seen quite afew swaps where it wasn't used

[cb7h23]

Do you really have too extend the bolts on the intake while using this gasket?? N I also know about brace had a friend manifold flyout because of it ...