The Stovebolt Site Forums The Shop Area Engine Shop Intake/exhaust Manifold weirdness and troubles

Thanks 1940GmcJoe!


What you describe makes sense to me.

I did get the two apart, which meant breaking off the Studs which held them together.

The Exhaust Manifold Heat Riser Baffle was long since frozen in the 'Block exhaust, Warm-up' Position...and, I removed it and gave it the Heave Ho. I will Plug it's Axel Hole of course.


Cut the broken off Studs off flush, and Drilled them out in stages, stopping right about where I thought the Threaded Hole Thread edges would be...

Took a nice crisp 90 degree end Round Nosed Punch, and tapped the 'shells' in and they fell out, showing no Threads in the Holes at all.

What the heck??? I guess the Studs were a press fit.

So, I grabbed a 3/8ths national Coarse Tap and I tapped the Holes.

I figure I will use some new Studs of course, or else Bolts.

However, to get the intake Manifold 'up' as much as it needs to be, I will have to have it's Holes Milled a little to be 'Good & Plenty' shaped.

My intake needs to come up about 3/16ths of an inch or so.

I will also need to have the respective mating surfaces, where the Intake and Exhaust Manifolds bolt together...have those 'surfaced' and this will likely need a thicker than original Gasket then.

I can likely make a Gasket using some thin Sheet Copper and some sort of heavy Hi-Heat material.

Once I get all this bolted up to align right with the ports on the side of the Head...I can then get all Manifold Flanged Surfaced, as an assembled 'Unit', so the assembled 'Unit' can be on a true flat plane same as the port Flanges of the Head are.

"PITA" is about right!! Lol...

Just seems mighty odd it would be so far 'off' like it was...but, I guess such things happened somehow.