91 Spark Plug suggestions

[tj 413]

I asked google what are the best spark plugs for my 91 350 V8 Blazer.

It says Best Overall- AC Delco R45TS for reliable stock performance. (Weirdly when I put my info into Summit Racing webpage these plugs come up as do not fit)

Alternative (Performance/Reliability) NGK V-Power UR5 (shows it fits)

I have aftermarket headers so google recommends

Best Options- Accel 8198 or Accel 0576S because they are shorty style plugs (shows they both fit)


Seeing I have aftermarket headers does it make the most sense to go with the Accel spark plugs?

 

[Wes Harden]

What plug do have in there. The shorty plugs help when you have clearance problems with the primary tubes.

Do you have aftermarket heads ?

 

[tj 413]

What plug do have in there. The shorty plugs help when you have clearance problems with the primary tubes.

Do you have aftermarket heads

I don't know what plugs are installed now. I do have aftermarket headers, unsure of make of them other than they are orange.

 

[Wes Harden]

heads and headers are two different things. Both do have an effect on spark choice. Aftermarket Aluminum Cylinder heads sometimes use totally different spark plug than factory GM heads.

Exhaust Headers only get in the way and can require the short "header" spark plugs.

So the cylinder heads have the biggest say in which plug you need.