Simple???? spark plug question

[Rex T.]

What is your preferece for spark plugs for our 67 L-79 327-350 hp engines? Not much choice on today's market. AC (I hear they are foreign made), Autolite (in a Chevy??????) and Champion (foreign made also??). Welcom to all thoughts.
Thanks,
Rex

[Jim T.]

Re: Simple???? spark plug question

Have used Champion plugs in my 68 327-350 for over 35 years. Another member gone from this earth liked Autolite plugs. I installed Bosch plugs in my 85 years ago. Still running the factory plugs in my original owner 96 LT4 with 38K interstate highway miles. My ZZ1 350-345 HP crate engine I installed in my 70 over 10 years ago still has the original AC plugs.

[J M.]

Re: Simple???? spark plug question

I have been running Autolite 295 in my 66 327/350 with good results.

[Duke W.]

Re: Simple???? spark plug question

The NGK B4 and Denso W14-U are NON-RESISTOR equivelents to the out of production AC 45, which is the best road use heat range for ALL SBs regardless of power rating. The NGK and Denso also have a better corrosion resistant finish than ACs.

New Corvettes use Denso plugs.

Duke