When I left the house and went to the lake, the Freedom Bird would bog down everytime I tried to accelerate. I didn't know what was wrong. I thought that a tune-up was the first thing to try.
I was surprised that when I pulled the plugs that I found this plug installed. When I went to NAPA. They gave me the same plug. I was confused. Shaggy took a tapered seat plug and the shop manual said that it took a tapered seat plug. How was it This 440 had a washered plug?
The first thing I did was check the spark plug hole.
There was no Taper.
I pulled a plug on Shaggy and checked. It had a tapered hole. I decided that I would install the plus with the washer. During this tume up, I checked the Distributer. It had a lot of play that I was going to assume was the cause of the bogging. I was surprised that it didn't backfire because there was so much play.
I guess the best thing to do is replace the plugs with what comes out. The parts store did give me the correct ones.
Just after posting this page, I found my Engine Casting Number and Identification Guide.
As you can see in this chart, you could end up with either a tapered plug hole or a flat Spark Plug. Shaggy is tapered and The Freedom Bird is Flat. I guess it helps with cooling.