Gasoline or E85 ethanol-blended fuel? David Freiburger and Steve Dulcich at Engine Masters wanted to find out which makes more power and by how much. So they grabbed a 489-cubic-inch, 13.5:1 compression big block Chevy, teamed up with our partners at Summit Racing for a couple of key parts, and started playing. To ensure a level playing
Conventional wisdom says roller rockers increase horsepower by reducing valvetrain friction—with the biggest benefits showing up at high RPM. But Engine Masters’ David Freiburger and Steve Dulcich are always willing to question conventional wisdom and will leave no horsepower sacred cow untouched. They’ve tested parts to see what really works, built engines to find the
The Motor Trend show Engine Masters is all about finding out what makes horsepower and what doesn’t. Hosts David Freiburger and Steve Dulcich have tested everything from headers and carburetors to camshafts, superchargers, mufflers, and air cleaners. In Engine Masters Episode 28, they set out to learn whether cylinder heads with big intake runners really
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