I am planning on installing my headers this weekend with the help of my friend. He says I need headers spark plug. I guess they are the shorter ones. Is this type of plugs really necessary for my 68 Firebird? I have a 350 engine. I just thought I'd verify with the forum. Thanks.

Pfffft. You should ask your friend about blinker fluid and muffler bearings.

I have the "normal" style plugs in my 455 with headers. I guess for '50's style fun, one could put a spark plug into the end of your headers (uncorked) and watch flames come out!

Salmon38, did you have to use a special socket wrench to install/remove the plugs on your motor?

Yes and no. I make sure my tool set has the specialized "spark plug" sockets for both the normal and "Cleveland" style plugs. These are the deep sockets with the sponge rubber washers in them so that you do not torque the socket off to one side and snap off the top of the plugs.

I used to have a Mustang with a 351 C so I have always had the 14 mm spark plug socket around. I believe the 454 in my Chevy truck also has that size plug.

I also put anti seize on spark plugs that go into aluminum heads.

Small block Chevy headers are right over the plugs so the Accel shorter plugs help in that application.
There is no need for them on a Pontiac motor.

I forgot one more advantage of the "spark plug" sockets. The plugs are nicely gripped by the socket and do not fall into inaccessible spaces after you remove them. Also, the socket along with an extension can help with getting a recessed plug into it's hole without cross-threading it.

Alright. Thanks Salmon38. Thats all I wanted to hear, "There is no need for shorter plugs on a Pontiac motors".