ive heard 300
but ive heard 5.3 have around 315
sooo im kinda lost...
any help would be appreciated thanks....

 

345 i think

 

It depends on what vehicle the LQ4 came in as to what it was rated at. Example; the LQ4 6.0L in a Yukon Denali would have been rated at 335hp that year. Another example would be the LQ4 in the 2001 C³ and 2002 Sierra Denali was rated at 325hp, while the same engine in the 2500/3500 series trucks were rated at 300hp.

P.S., only the tune and exhaust configurations changes between the vehicles and not the engines themselves.

 

345 is all ive ever heard...I know lq9 has more compression making it a little more.

 

The 2007 Classic GMT-800 models with the LQ4, just as what I was previously stating, all depends on the vehicle that the engine was installed in. In the 2500/3500 series models, the LQ4 was still rated at 300hp/360ft-lbs, while in other vehicles it was rated at 335hp/375ft-lbs.

The 2007 GMT-900 series trucks with the LY6 6.0L were rated at 353hp/373ft-lbs. Vehicles with the L76 were rated at 367hp/375ft-lbs. Of course the LY6 and L76 engines were Gen IV’s.

Only the LQ9 was still rate at 345hp/380ft-lbs.

 

HD trucks with LQ4 were 300 hp/360lb/ft.

The LQ4/9 tuned out on the engine dyno make around 390hp, bioth engines are within 5 hp.

The GEN 4 LQ4 equivalent is the iron block LY6 with 9.9:1 CR. Its pretty much an LQ4 with L92/S3 heads. Cammed out its an easy 500hp engine, 540 with some detail.

peace
Hog