Home | Product & Installation Articles | COMP Cams | Speed Secrets: Zex Nitrous and Small Block Chevy Engines

Speed Secrets: Zex Nitrous and Small Block Chevy Engines

Whether from a turbo, blower, or nitrous, there is a lot to love about power adders. Especially when used in a Small Block designed specifically for them, like the SBC 383 Stroker from Blue Print Engines. It has everything you’d want for power adder applications, Including forged internals, low compression, and aluminum free flowing heads. Making the 383 that much more desirable, BPE chose an adequate cam for the small block, that was not too wild for street applications, but not too mild either. With a little help from the guys at Zex, Richard Holdener with Speed Secrets put this BPE SBC 383 stroker to the test. 

Since the SBC came from BPE as a long block, all that was needed to get it ready for the dyno was an intake, carburetor, and distributor. Once installed, the 383 SBC made 446 HP @ 5,900 RPM and 455 Lb-Ft of torque @ 4,300 RPM naturally aspirated. With a good healthy start, it was time for the Zex nitrous kit. Perimeter plate technology not only simplifies installation, but ensures even distribution of nitrous as well. Another really nice part of this kit is the adjustability, Zex offers different jets to adjust the shot of nitrous from 75 HP all the way up to more than 200 HP. With the bottle warmed, and nitrous and fuel pressures optimized, Richard started with a 75 HP shot. 

The SBC made great power gains with the 75 HP shot but a 100 HP Shot bumped it up to 572 HP @ 5,600 RPM and 609 Lb-Ft of torque @ 4,800 RPM. Thats nearly a 130 HP gain out of a 100 HP shot of nitrous, which is not unusual results from Zex nitrous but it does require taking the time to optimize the tune. With the right tune a SBC intended for power adder applications, coupled with a shot of Zex nitrous, is a powerful combination.