Join Date: May 2012
Location: Surrey, United Kingdom
I have JBA shorty headers on my 302 and one spark plug on the drivers side is difficult to access as you say. I was determined not to have to remove the header just to remove a spark plug.
I was able to slide my spark plug socket over the spark plug, but there was no room to plug a ratchet or anything else into it.
I ended up drilling a hole through the end of the socket, and using a metal rod slid into the hole, I could tighten the spark plug. I would hand tighten it as much as possible first and then give it a bit more using the metal rod. As spark plugs do not have to be done up very tight, I found the metal rod worked fine. I drilled holes through the socket in several places, so there was always a hole visible at any rotation of the spark plug.
Alternatively, if your spark plug socket has a hex end on it, then you might be able to get a ring spanner ( sorry wrench ) on the end once it is slid over the spark plug.