I have a 455 toro block that I have had hot tanked, magnafluxed, and pressure tested.Everthing checks out great and the block looks new. I removed the front gallery plugs no sweat, but the rear plugs are stuck big time. I put a torch on the outer driverside rear plug and used an air impact wrench on it but it did not move and the allen type head started to strip. I didn't heat it too much because I was afraid I would hurt the block.The inner plug is some wierd square type head that I don't think I have a wrench for. I put kroil inside and out on both of them 2 days ago and left it. Any suggestions???

 

Those plugs need to be drilled out and removed with square tapered extractors. You will probably have to drill them to at least 3/8. You will need square sockets to drive them.
Seems like a big pain , but this will work. Also the oil galleries will need to be cleaned again. Thanks Milan

 

Where would I find these at?? I've never seen them before.

 

I have found Mopar spray rust penetrant to work well. You can also whack on them with a hammer to help break them loose.

 

You might benefit from reading this thread (most recent post about an hour and a half before you started this thread).

- Eric

 

Is the Allen head plug on the back, not down in a hole? You might try brazing something to it that you can get some torque on. Either a section of the allen wrench, or even a bolt.

Then for the other piece, here's a thread talking about the plug with a square hole in it.

https://classicoldsmobile.com/forums...ving-plug.html

 

Eric... you must type just a little faster than I

 

Good post. I had to use this method yesterday to remove my plugs from a 73 455. I let the plug sit with penetrating oil and heated them fail. After stripping the head of the plug I tried to shock it free with a chisle notch and punch fail. I could have saved my self some time if I went straight to the easyout.I used the 3/8 easyout and it came out easy.Good luck removing your plugs.

 

Thanks guys for all the help, wish me luck!!!!!!!!!!

 

Got my set at Sears , you will need square sockets too ......