Which spark plugs for shorty headers?

[handloader90]

79' K5
6.6l 400 SBC

Currently has stock manifolds which will stay on for a little while, going to run shorty headers after I get the engine running.

I was going to run some these: http://m.summitracing.com/parts/ado-r45ts

Worried about clearance issues with headers though.

Saw these:
http://m.summitracing.com/search/part-type/spark-plugs/make/chevrolet/engine-size/6-6l-400/engine-family/chevy-small-block-gen-i/shorty-spark-plug/yes

Just trying to see what people are running to make sure everything clears.

 

[76zimmer]

I try to run the manufacturer OEM plugs whenever possible...in this case it may not be...do the headers say there is plug interference?

 

[handloader90]

Haven't made my mind up on exactly which ones I'll end up buying.

 

[handloader90]

I try to run the manufacturer OEM plugs whenever possible...in this case it may not be...do the headers say there is plug interference?

What are you running OEM wise?

 

[76zimmer]

I have BBC 781 heads and not positive, but I think R45TS in those.

 

[toomany]

If you have stock heads, or any straight plug heads....most headers (long or shorts) will clear decently with a regular spark plug. At least in my experience. When you get into angle plug heads you start to have clearance issues. I run Accel shorty plugs in my Bowtie heads. Cylinders 3&4 are tight, had to dimple the tube slightly. The others clear fine. That is with Headman 69230's.