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ARP 12-Point Nuts - 3/8 in.-16 Thread Size - Free Shipping on Orders Over $109 at Summit Racing

You can get special nuts with the same threads.

Rough them up and use RTV. Two piece plates are the worse. I found that marking both sides of the plate for a gasket and then taking a dremel tool with a pointed carbide and grinding circles in the plate around the ports. This allows the RTV to have a area to bite into simulating an o-ring...

It also needs to be in the 10 to 2 o'clock position. Not horizontal or pointing up. Needs to be pointing down to keep the moisture away.

I guess you have never done one.

The hole is already there. All he is going to do is size it and retread it for the heli-coil. No reason to overthink a simple project.

Should be a blind hole. Easy to check. Fill it with brake clean. Thread should be 7/16-14

the 6-27-74 casting sounds right for the 7-26 assembly date. Blue in color sure makes it seem production.

My guess 5 would be 1975, T Trenton engine plant, 7-26 July 26 which could be early assembly for 75 model year.

Is there a VIN above the right pan rail? How about numbers by the distributor area?

Pictures are needed. There also should be casting dates. Also should have a VIN and numbers stamped by the distributor. That number has been brought up before and I believe it is a normal 1974 [aprox.] block.

There were different foundries as I recall. There were different ways to identify them and the different changes. Do you know the part number? Googling the number may come up with the Mopar sales information.

I thought they were. There were several versions of those blocks. I know my wedge had bolts but I upgraded to studs.

I would think so. The center 3 mains are cross bolted. As I recall they used ARP bolts.

Looks good. Bet it did not take long to do.

Mark it and make the cuts. Take your time and clean it up when done.

Just a regular cut off wheel. Make two careful cuts and the main piece is removed. Then clean it up. Its not a critical cut its just for clearance.

That can easily be cut with a disc and then finished with a grinder, flapper, or carbide cutter.

Its just cast iron so grind away.