I read a lot of threads about the best plugs for 455 engines.
What are the best for 350's? This is a two part question. If I want performance which ones are the best? If I want longevity which ones are the best? Also who has the best wire set? My car is a 72 cs. Thanks!

 

To answer your question for a stock engine, then stock and ...stock. For performance engines it's a little more complicated, everyone has their own favorite brand and heat ranges are based on combustion characteristics. For wire sets I like Taylor Spiro-pro.

 

I am just talking about a stock engine. What I meant by performance was a plug that gives more boost.

 

Plugs don't give boost, they work or they don't. Higher voltage spark is gained by a performance oriented ignition system.

 

i dont think its that easy to answer... depends a lot on type of fuel used also...stock plugs should be fine, i have always used A/C