Jamesbond2509

iTrader: (1)

Well I finally blew the engine after 100000 miles of 15 lbs boost everyday for 6 years and have ordered an LS9 cam for a new engine build. Does anyone know if the LQ4 Blocks have the provisions for the timing chain damper and do I need one? Your help would be much appreciated.

03sierraslt

iTrader: (22)

As to your question, I am not sure. What let go on your motor?

Vortec350ss

iTrader: (20)

I'm impressed it lasted so long with that much boost.

As for the cam, isnt that better suited to rectangular ports with boost? Most custom cams I see for cathedral port heads dont have quite that much split.

03sierraslt

iTrader: (22)

That actually a good split for boost but it wouldn't be my first choice do to the 122.5 LSA

What size motor is going back in?

Jamesbond2509

iTrader: (1)

The lifters got pooched and looking back now it made sense. I put in the Com 918 springs which increased the load by at least 50lbs at full valve opening and I should have also changed the lifters to the comp cam ones. Eventually all the lifters collapsed and I found needle bearings in the oil. Had the lifters held up there is no doubt in my mind that I could have gotten 150000 miles.

I am picking up a new LQ4 tomorrow and retrofitting the motor with the LS9 cam and LS9springs. I considered the LPE GT9 cam which will need comp springs for sure but elected for some fuel economy since it is a daily driver. The dyno chart on the LS9 seems to pull very hard past 6600. The LSA should allow me to idle at 500.

Im also considering a powerbond pulley to get some extra boost while the motor is out.

Jamesbond2509

iTrader: (1)

Also I found out the LQ4 blocks do not have the provision for the chain dampener. I will be relocating the cam sensor to the front cover so we'll have to see how that pans out.

doublenot

iTrader: (12)

Lpe has a cam sensor relocation kit. Lq4 blocks have untapped bosses but the chain dampener for the ls1 is different than ls2. I was going to run the ls9 cam but have changed direction. I'll be interested to see your results.

Jamesbond2509

iTrader: (1)

Yeah, I really should be porting the heads while the engine is on a stand - that should really wake up the engine up top.

dueces

iTrader: (2)

If your going with the LS9 cam on a 6.0, why not just go with the L92's and have the rec ports? I would think That would flow as well as getting the stockers ported....

John

Rick_Vor

iTrader: (36)

...and the cam was desinged with the low intake/exhaust flow ratio of the L92's. Rectangular port cams have a ton more seperation between in/ex duration.

Rick