Best plug choice

[eagleguy]

What would be the best brand and gap for plugs needed for the following mild additions or would stock plugs be just fine?

TA49 turbo
36# injectors
160 thermostat
100# valve springs
turbo tweak chip
hot wire upgraded fuel pump

 

[turbojd]

1. NGK UR5's
2.AC Delco R43TS
3.Autolite 24's gap at 32

 

[getdowngranny]

NGK YR5. Gapped at 28-30


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[Ttype6]

It doesn't matter which of the offered plugs you use. You won't need to reduce the gap from .035" until you're making a lot of power with a lot of boost. Then again,your ignition system will let you know when it's time to reduce the gap.

 

[eagleguy]

Thanks

 

[eagleguy]

Just found that my car has Autolite 24 spark plugs which I have never used in any of my cars so I don't have an opinion. In my older Buick I liked the way NGK's held up as compared to the AC Delco which seemed to foul easier. What is the difference between the NGK YR5 and the NGK UR5?