There are two plugged holes above the middle intake ports... and there is a nipple right next to the oil filler hole that is plugged with a rubber plug... any idea what that is?

 

You should post a picture

 

Pictures please

 

Wish my camera was workin.. .ill try and get some pics tonight

 

The nipple next to the oil filler neck means its an older intermediate housing. I see this plug on early '93 engines but not on later cars. Leave it capped off.

Jack

 

Yep, seen it too.

The other holes near the intake ports. Injector holes in the center housing?

 

Ok guys thanks for the clarification on the nipple... now just to figure out what these other holes are! lol

 

My reman has the same thing. Can anyone clarify this furter??
John

 

My reman has the same thing. Can anyone clarify this further??
John

 

Just something on earlier made engines

 

Scratch that.

 

Earlier made as in 87-91?? or early 93 engines?? How can you tell the difference?
Thanks,
John

 

87-91, but the housings are all pretty much the same as a 93-95 with the exception of 2 holes you have to fill in(I think on the 87-91 it was a coolant passage) and that thing thats capped off.

STEPHEN

 

I actually did a little research. The plate has n3a1 stamped on it, it is from an early 93.
Thanks

 

87-88 intermediate housings (I'm not sure about 89-91 but I assume they're similar) have the intake ports about an inch lower than the 93 making it imposible to bolt up to a 93 manifold. So I should hope it's not a 87-91 housing. In the pic the right is the 93 and the left is the 87. I compared these for my rew project to see if I could use the 87 housing in the 93 engine to mount it in the car easier.

 

My reman also has the nipple next to the oil filler neck. Mazda installed my engine and put a long vacuum hose on the nipple with a check value on the other end of the hose.