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I have a 1972 Jeep CJ-5 with a 3.73:1 gear and 33-inch M/T tires. The engine is an AMC 360 rebuilt with 8.75:1 compression, stock heads, and a COMP Thumper […]

I have a big-block Chevy in a ‘69 El Camino that I just purchased. I really don’t know much about the engine other than it is a 454 with an […]

I have a 2015 Silverado with a 5.3L with long tube headers and I’ve installed a Whipple supercharger. My 6-speed trans is now slipping. Can you give me any direction […]

I bought a set of TFS valve springs (PN 16918-16) for my Summit 8702 cam for an LS engine and I realized these springs are only good up to a […]

I’ve been reading you for years at various magazines like PHR, Hot Rod, and Car Craft. I’ve been curious about the lower end of the torque curve. Looking at various […]

I have a 2012 F-250 Ford built to use flex fuel. What is the best way to maximize miles per gallon? Is there any advantage to running 1/2 tank of 93 […]

I’ve seen in a 4.8L LS engine story where you used a COMP short duration hydraulic roller cam and the engine made really good power. That cam, if I recall […]

I just bought a big-block Chevy pickup from my neighbor who has had the truck for years. He’s been tinkering with it but has finally decided it’s smarter than he […]

I’m in the process of tuning up the HEI distributor in my 350 small-block Chevy. The engine has a mild cam. My understanding is that to re-curve my distributor it […]

What does this code on my nitrous bottle signify? — M.A. Jeff Smith: The stamp on your bottle represents the date it was certified—in your case December 2017. Each nitrous […]