What spark plugs to run

[Damufuer]

Hi- Picked up a 1975 K5 Blazer a couple months ago. Slowly going through it and figured it’s time to give it a tune up as I can see the current plus are old and rusted. Did some searching on here for what plugs to run but it started to get confusing pretty fast, I have no idea how hot I want the plugs to be and what even goes into that decision. Any help would be greatly appreciated.

Original motor, sbc 350, guessing around 150k miles, no mods other than a new Edelbrock carb and manifold. Current plugs are AC Delco R44T

Thank you!

 

[Bent77]

You’d be hard pressed to do better than those Delco plugs. Replace them with the same number and range plug and have no worries

If it’s too rich, then worry about changing the carb setting and not the plugs

 

[Wes Harden]

Welcome @Damufuer Nice score 1975 full top convertible. What Bent said x2

 

[76zimmer]

I concur. Run the plugs designed for the heads!

 

[Damufuer]

Great! Love the consensus. Thanks all!