🔌 ACDelco CR43TS Spark Plug (5614029) - Box of 8: Professional Conventional Pick for Reliable Performance Review

I bought these about a year ago and really smoothed out the V8 engine in my '94 Ford F150! This seems to be the real deal for quality spark plugs. I love her!

Remember to use anti-seize threads. You're probably better off getting the Iridium version or even NGK, who will post their product specs in detail.

AC Delco spark plugs are great! Smoother idle, better throttle response, better gas mileage. These plugs are highly recommended.

I bought a '94 Burban and immediately started tuning it. Collected back - misfires, after replacing additional vacuum hoses and sensors, the misfires did not go away. I pulled out every cork and they were soaked. Tried Bosch spark plugs, stopped misfiring.

These plugs are different than those that were released. Now that they installed them and just noticed the difference. They protrude further down into the bore of the cylinder. I agree with another 1* review. Is this a design change? 1/2 of my ports are hard to reach and I don't want to change them. Not sure if that's a bad thing as they don't hit the pistons (I tested that) and the truck runs fine. I'll leave that for now and update later.