I need exhaust advice.

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dartnabout

dartnabout

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I know this is for "A" bodies but I needed to put a transmission in my 1988 dodge RAM truck. The old 318 had several oil leaks so why not do some freshening up. I noticed when I removed the exhaust manifold to repair some broken studs, that there are 3/16" holes below each exhaust port. One of them is open and it is at least 1 1/2" deep. The other three on the passenger side are plugged tight. I looked on my old 318 sitting here ready for the dart and there are none on it. What are they for? Can I drill them out? and how do I keep the carbon from going in and building up for that matter. Are they for the heat regulator? Maybe 1988 is too new for me to be working on!
Thanks!
Dartnabout
 
The pictures shown are missing the little holes. Yes they are directly under the exhaust ports. I have not taken the heads off just the exhaust manifold. On the pictures you sent you can see like a milled lobe hanging down on each exhaust port. There are actually bigger holes in the manifold to match the holes in the head. But I can't determine where they go!
 
dartnabout said:
The pictures shown are missing the little holes. Yes they are directly under the exhaust ports. I have not taken the heads off just the exhaust manifold. On the pictures you sent you can see like a milled lobe hanging down on each exhaust port. There are actually bigger holes in the manifold to match the holes in the head. But I can't determine where they go!
Click to expand...

there for smog if i remember, just plug them if ur not using the matching manifolds
 
Those holes are there for the air injection system (smog). I just tap them and run in some Allen head plugs.
 
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