[stan_the_man]

I just wanted to share the results of my research.......

NGK 2771 plugs are 1/4" shorter than AC Delco R44T and a little more than a 1/4" shorter than Autolite 25 series plugs. I didn't get to compare them to Accel but they have a lot of room for those tight headers, which was my problem. I can fit my finger in between the NGK plug and my summit headers (1-5/8" primaries).

Hope this helps

 

[6NOVA4]

whats the other number on that NGK plug? the 2771 is the stocking number.

 

[stan_the_man]

UR5 but most auto part stores use the stocking number.

 

[nukledragger]

I just wanted to share the results of my research.......

NGK 2771 plugs are 1/4" shorter than AC Delco R44T and a little more than a 1/4" shorter than Autolite 25 series plugs. I didn't get to compare them to Accel but they have a lot of room for those tight headers, which was my problem. I can fit my finger in between the NGK plug and my summit headers (1-5/8" primaries).

Hope this helps

Good info, I have one plug with the same issues. Is the NGK a small short reach tapered plug, or the 3/4 inch reach shouldered plug?

 

[stan_the_man]

Here's the specs on it.
http://www.sparkplugs.com/results_cross.asp?pid=ur5&x=0&y=0

It has a tapered seat