Complex sentence: It is a 3.9 litre Ford flathead V8 with similar dimensions as the original engine used in the Ford V-8, but with about 50% more power at 125 b.h.p.
Split into simpler sentences: It is a 3.9 litre Ford flathead V8 with dimensions similar to the original engine used in the Ford V-8. However, this engine has 50% more power at 125 b.h.p.