Spark plug question

[RT1$]

What spark plug should I use for a 1968 440 with high compression?

 

[dadsbee]

Hit the search bar. You'll see the past 100 arguements on this from days past.

I'll start the 101st argument ... J11Y's.

 

[twecomm]

I have had good results with E-3 plugs in my 383.

 

[Orig69]

Autolite 75

 

[moparedtn]

Hit the search bar. You'll see the past 100 arguements on this from days past.

I'll start the 101st argument ... J11Y's.

What they came with, yep.

 

[Geoff 2]

NGK '5' heat range. From my NGK catalog [ remember them? 440 cu in from 1960-74
BP5S plugs.

 

[kiwigtx]

I'll start the 101st argument ... J11Y's.

......and then the fur began to fly.

 

[Geoff 2]

NGK numbers

 

[BSB67]

What spark plug should I use for a 1968 440 with high compression?

How high?

 

[beanhead]

How high?

I'm glad someone finally asked that!
And does '1968 440' mean the heads are the factory irons? 'High compression' says this engine's been built up and that makes me wonder if there may possibly be different cylinder heads on there.