The 3600 LY7 (and derivative LP1) are members of General Motors' new High Feature (or HFV6) engine family of modern DOHC V6s. This new family of engines was introduced in 2004 with the Cadillac CTS. Holden sells the HFV6 under the name, Alloytec. The block was designed to be expandable from 2.8 L to 4.0 L.

It is a 60° 24-valve design with aluminum block and heads and Sequential Electronic Fuel Injection. Most versions feature continuously-variable cam phasing on both intake and exhaust valves and electronic throttle control. Other features include piston oil-jet capability, forged crankshaft and connecting rods, variable intake, and electronic throttle control.

Rumors say that the family was developed by Honda as a follow-on to GM's purchasing of the L66 engine from Honda, but GM denies this. Other reports link it to the Cadillac Northstar engine, though GM already has an unused V6 variant of the Northstar, Oldsmobile's 3500 LX5, which is a 90° V6 engine vs. the 60° bank-angle of the HFV6. The truth, according to GM, is that this engine family was developed by the same international team responsible for the Ecotec, including the Opel engineers responsible for the 54° V6 with involvement with design and development engineering from Ricardo PLC of England.

High Feature V6 engines are produced at Fisherman's Bend in Port Melbourne, Australia, and St. Catharines in Canada.

notizia di una fonte americana, notare che nonostante si parli di date dopo il 2000 viene nominata l'honda(smentita) ma non la fiat.

questo articolo e' pieno di stronzate....

non essendo fonte gm è solo per rigor di cronaca.