Accel not so shorty plugs

[67possible]

I have a 67 Coronet with a 440 and Hedman headers. I recently changed from iron 452 heads to Edelbrock RPM. Most of the spark plugs were a pain to change with the iron heads. Changing to the Edelbrock heads made it much easier because of the angled plugs vs the straight. EXCEPT for the #6 plug..... I bought Autolite 3924 plugs for the new heads and the tip of the plug actually touched the header tube that loops over from the #2 cylinder. I didn't want to hammer away at the tube to make it fit so i started searching for a "shorty" plug. I bought Accel shorty plugs since they seemed to be hyped up the most.



Save your money unless you just want a tiny bit more clearance.

 

[WileE]

It's the plug-angle & header-design conflict.

 

[67possible]

Yeah, I was thinking the "shorty" plugs would be like for a lawn mower, about 1/2 inch ceramic or so and would clear pretty well. Apparently nobody makes anything like that, so I bought some Accel 9000 ceramic boots and hoping they don't melt.

 

[HT413]

I'm running Autolite 2974's. a good 1/2" shorter than standard plugs and plenty of clearance for headers.

 

[67possible]

Those appear to be much shorter, but with the Edelbrock heads, I need .750 reach.

 

[HT413]

Oh, right. Forgot about that with the eddie heads.

 

[Wedgeamacallit]

The Edelbrock heads call for 2 inch header tubes unless you buy a set that is specifically made for the head. The bigger tube header will give you more spark plug clearance. I'm surprised you only had issue with #6. I'm not aware of any shorter plug that would help your problem.