"P400

Early Miuras, known as P400s (for Posteriore 4 litri), were powered by a version of the 3.9 L Lamborghini V12 engine used in the 400GT at the time, only mounted transversely and producing 350 PS (260 kW; 350 hp). About 474 P400s were produced between 1966 and 1969 - a success for Lamborghini despite its then-steep $20,000 USD price (approx. $114,000 in today's terms).

Taking a cue from the Mini, Lamborghini formed the engine and gearbox in one casting and they shared common lubrication until the last 96 SVs, which used a limited slip differential requiring appropriate oil.

It has been reported, but not confirmed, the first 125 Miuras were built of 0.9mm steel and are therefore a bit lighter than later cars. All cars had steel frames and doors with aluminum front and rear skinned body sections."
http://en.wikipedia.org/wiki/Lamborghini_Miura