1969 Z28 DZ302 with 140 First Design Offroad Camshaft. Headers and Gardner Chambered Exhaust
Here is the car idling.
Soundbite of 1969 Z28 Camaro with Comp Cams XR274R Cam No. 12-770-8
Stock Z28 "DZ" 302 cu. in. motor with upgraded valve train including Comp Cam's solid roller cam 12-770-8, springs, lifters, push rods, cam button, and #1804-16, 1.5 ratio Ultra Pro Magnum Roller Rocker Arms. Initial timing set at 12 deg. BTDC, idle speed between 900 - 950 RPM. Results: Very responsive and reliable power from 2200 to 6200 RPM. Soundbite is through stock Exhaust manifolds and Exhaust system with the transverse muffler, and without resonators.