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Rover 3.5L V8 Standard Engine vs Stage 1 Upgrade

Comparing 2 rebuilt V8 Rover engines. 100% standard vs minor upgrades to give it more performance! We could put a Holley carb on or a big fancy exhaust manifold to make it a lot faster, however the goal was to keep the car looking externally 100% standard. These two engines Dyno tested under the exact same conditions, same fuel etc. What difference can these minor upgrades make? Facebook -   / penguinmotorslimited   Instagram -   / penguinmotorslimited   Engine 1 for factory restored, standard Rover P6 3500 V8. Engine 2 for upgraded Rover P6 3.5L V8 which was later upgraded to 4.6L Upgrades: Switched out standard 14v heads for 4.6 10v heads. Small bit of port work, smoothing out intake ports where they meet the valve throats and the intake manifold. Poppet valves fitted to the carburettor butterflies replaced with flat ones. Cam swapped to a Newman Phase 1 Mild Cam.