Chevy's V8 entries into the direct injection marketplace, the LT1 and LT4, are absolute screamers. But, when more isn't enough and it never is for us horsepower hounds Edelbrock is here with two new performance head offerings. The first, the Performer RPM, features upgraded valvetrain hardware and .75-inch thick decks for added strength in high power applications. The chambers are CNC ported and the runners are packed with extra meat for additional porting. They flow about 330cfm, about 15 percent more than factory heads, and all factory hardware, including the direct injection hardware, bolts right up. According to Edelbrock engineer Rob Simons, a CARB EO number will make these heads 50-state legal.
The next head, the Victor JR. takes the ante way, way up. The valve angles are rolled back to 11.5-degrees and canted to 4.5-degrees for massive 375cfm intake airflow. The revised geometry also takes advantage of oversize, hollow-stem, stainless valves. The biggest change to the Victor JR.'s architecture is the relocation of the exhaust ports forward to straighten the exhaust runner out, significantly improving flow.
"The factory head wraps the exhaust port around the intake port, likely to fit vehicle applications already in existence, but it's a huge detriment to airflow," said Simons. "The exhaust on the Victor JR. has a nice straight shot and fully CNC'd intake and exhuat ports."
The change does necessitate a custom header, but Edelbrock worked with Kooks Custom headers from early in the development process to ensure that there is a header available that fits 2016 Camaros, and they are working on one for the 2016 Corvette as well. "On older cars, if you use an LS Swap header on an LT, they will bolt right up," adds Simons.