The final version of the “Merlin F85” heads were dyno tested. The heads were fitted to a 5 litre engine, which had been converted from a 3.9, using our 5litre stroker kit. The heads performed very well, we obtained 353ft lbs of torque. Also, the torque exceeds 321ft lbs between 2500 & 5500rpm. These figures were obtained using 10.5:1 compression, and our new “Tornado” camshaft, 224/231 degrees @ .050” lift, .508”/.512” lift.
The cylinder heads are much stiffer than the standard Rover unit, which can distort easily, and the rocker gear is not very stable. Two extra rocker pedestals are supplied for each head. Rocker covers are supplied, complete with bolts. Valve guides are manganese bronze, and the valves are stainless (1.73 & 1.45”). The exhaust seats are very hard, and will withstand most fuels including LPG. As supplied, the heads are good for .520” lift. Use an PP-BYRC9YC spark plug to begin with. Exhaust ports are raised slightly. Regular inlet manifolds fit.
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