How do I tell the correct heat range spark plug for an engine? – Mark S. Jeff Smith: Simple questions sometimes require a bit longer answers. This is one of those cases. Let’s start with a typical street engine. For a stock engine, the answer is simply to use the recommended plug for the application. Clearly,
You did a tech answer around two years ago which was about adding a set of Vortec heads to a small-block Chevy. How much of a horsepower gain could you expect from porting these heads using the cam and everything? — R.B. Jeff Smith: We wrote about Vortec heads in 2016, and that article spawned
I’m confused. I see all kinds of opinions about iridium and platinum spark plugs versus the normal copper plugs. Some say they’re good while others say not to use them because they’re only for late model cars that are concerned with emissions. I like the idea of spark plugs that could last longer. I have
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