I have a co-worker who just acquired a 2006 Shelby AC Cobra Roadster replica made by Back Draft. While he's always admired performance Ford racers, he's relatively new to owning performance cars, his main hobby has been golf, and he might need some advice for what oils to run in this new-to-him magnificent beast.
It has a Ford Motorsports built 351 Windsor crate engine, stroked out to 393 cubic inches, +.030 bore (3.030 inch bore), +.350 stroker crank (3.850 inch stroke). 9.7:1 compression ratio, requires minimum 91 octane gas, was factory rated at 440 hp at the flywheel. The previous owner had it chassis dynoed at a performance shop in Michigan after some routine maintenance work about 3 years ago - I need to look at the dyno chart again to relay what those results were (but I think a little over 400hp on the wheels). It uses forged pistons, ported stock Windsor heads with 1.94 intake and 1.55 exhaust valves, true roller rockers, Victor Jr. intake manifold topped with a Holley square bore 750 cfm carburetor on a spacer, Crane hydraulic roller cam, headers, Laker pipes, and serpentine accessory drive. Fuel comes from a tank-mounted electric fuel pump. Emission controls are limited to PCV valve only. The factory manual states the main bearings are clearanced at +.025 to .030" and the connecting rods bearings are +.013 to .018".
The output drives through a Tremec close ratio 5 speed manual. I do not know the ratio in the differential (likely in the range of 3.3 to 4.1 but that doesn't pin it down), but will try to find out the engine rpms at a known speed in 4th gear, which I think is direct drive 1:1 - with the tire circumference I should be able to calculate it that way.
Maybe some of you folks with experience with high performance hot rods would like to offer your opinions about what oil and viscosity (range) that they would use in the engine, transmission, and differential. Like me, he lives in north Florida, absolutely will not drive in rain or cold weather - meaning it could get stored from December to February, and says he plans to mainly cruise around only in low traffic, with very limited numbers of "hard acceleration events". He thinks he'll put about 2,000 miles a year on it.
It has a Ford Motorsports built 351 Windsor crate engine, stroked out to 393 cubic inches, +.030 bore (3.030 inch bore), +.350 stroker crank (3.850 inch stroke). 9.7:1 compression ratio, requires minimum 91 octane gas, was factory rated at 440 hp at the flywheel. The previous owner had it chassis dynoed at a performance shop in Michigan after some routine maintenance work about 3 years ago - I need to look at the dyno chart again to relay what those results were (but I think a little over 400hp on the wheels). It uses forged pistons, ported stock Windsor heads with 1.94 intake and 1.55 exhaust valves, true roller rockers, Victor Jr. intake manifold topped with a Holley square bore 750 cfm carburetor on a spacer, Crane hydraulic roller cam, headers, Laker pipes, and serpentine accessory drive. Fuel comes from a tank-mounted electric fuel pump. Emission controls are limited to PCV valve only. The factory manual states the main bearings are clearanced at +.025 to .030" and the connecting rods bearings are +.013 to .018".
The output drives through a Tremec close ratio 5 speed manual. I do not know the ratio in the differential (likely in the range of 3.3 to 4.1 but that doesn't pin it down), but will try to find out the engine rpms at a known speed in 4th gear, which I think is direct drive 1:1 - with the tire circumference I should be able to calculate it that way.
Maybe some of you folks with experience with high performance hot rods would like to offer your opinions about what oil and viscosity (range) that they would use in the engine, transmission, and differential. Like me, he lives in north Florida, absolutely will not drive in rain or cold weather - meaning it could get stored from December to February, and says he plans to mainly cruise around only in low traffic, with very limited numbers of "hard acceleration events". He thinks he'll put about 2,000 miles a year on it.