I completely disagree with this statement. They bolt on and work the valves down and up just like 1.6:1 rockers do, just with about 0.030' less travel. Why would anyone need 1.6:1 rocker arms to run this cam? Are 1.5:1 ratio rockers incompatible? answer: An LT4 hot cam will not work in an otherwise stock pickup truck.Ĭorrect for the most part. A well thought out combination of parts is what makes a vehicle perform better than in stock configuration. The LT4 hot cam is in thousands of old school SBC's both poorly matched and well matched to the rest of the combination. In a vehicle with an automatic transmission, a 'looser' torque converter is used to allow the engine to rev up closer or into the engine's actual operating range so that it can adequately propel the vehicle into motion from a stop. With less power available at or near idle rpm due to increased valve duration, it is more difficult for the engine to start moving the vehicle, or keep the vehicle moving. In other words, if typical operating range is from off-idle to 4500 rpm, when duration is increased, you should expect for the engine to start making respectable power at a higher rpm, in a direct relationship, where as the duration increases, so does the lower end of the operating range. This doesn't lend itself well to typical street operating rpm, as it shortens the rpm range where the engine is being efficient. Like any 'bigger' camshaft, lower rpm torque is compromised for mid to upper rpm torque when valve duration is increased. I don't claim smarter than GM engineering, but I wouldn't run that cam in anything.much less a Corvette. This cam is designed for a light vehicle ideally equipped with a manual transmission.

Ramjet 350 cam in l31