What is the best spark plug for 327 ?

[Wayne64]

Just wondering what is the best spark plug for my 327 solid lifter horse power ?
300. I curently run a/c delco.

 

[wallyknoch]

Use a AC R45.

 

[Wayne64]

That is the plug I have installed. I guess my question is their a better plug on the market now days ( Bosh etc.) I also have headers if that makes a difference with a breakerless se electronic ignition conversion kit. New reg wire set. thanks

 

[jimbo64]

I agree with Wally and thats what I have in my 64 -327/300

 

[Wayne64]

Thanks jimbo64. I guess i will stay with a/c delco. OOPS I took out my plugs and they are r43 not r45.
I have ordered a/c delico r45 thanks

 

[JohnZ]

The Delco plugs are fine - all the rest are marketing hype, and will only make your wallet lighter.

 

[Wayne64]

Thanks just ordered from gm. gap I assume is .035 thanks all
I replaced the plugs what a difference between the a/c 43 and the 45.