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5/8 of an inch

Dr. Jones' spacer installed:

It's going in my van, so there shouldn't be.

Here's the spacer sitting on the lower half of my ported manifold.

Lined up perfect with my ported manifold. I’ll take some photos when I have time.

Fits like a glove. (Albeit upside down...)

Got Mine!
High quality piece.

Interested

Should have asked Todd first!

https://www.amazon.com/Dorman-555-084-Expansion-Plug/dp/B0011N3746

HAlf as much here:

https://www.ebay.com/p/Engine-Expansion-Plug-Dorman-555-084/173922630

The plug was just there for the casting process. You can make a plug and weld it shut too.

I remember someone asking about that plug before. I don't think it was ever a seperate service part from Chrysler. You may have to hit up your local machine shop to see if they can source a core plug...

According to Stu Davis, the front of the upper plenum was supposed to be larger toward the valve cover. It was shortened up to make room to service the injectors. Every part on the engine was a...

I have a Forward Motion Enforcer engine that I plan to put in my van. It has a ported two piece. The port work done on the intake and on the runners of the head were left with a very rough finish by...