Compared to last year we needed to modify the engine concept, but next year we will keep the same concept. (wtf1.com)
We can tell you what spark plug to use for a stock engine, but once you start modifying the engine, all bets are off. (mechanics.stackexchange.com)
One in four Corvette owners modify their engine control systems, valvetrains and electrical systems, while the most popular accessories include floor mats, license plate frames and alarm systems. (corvetteblogger.com)