Lord_Vaders_Hawk

iTrader: (5)

Hopefully I have posted this in the right forum. I'm currently looking for a LQ4/9 bare block, may have one pending a sale. From what I have researched on here and finding information. This block can be built to a 377 ci. Is this with machining it to .030/.040 over?

My plans are to have a very solid running motor. My LS in my Firehawk is needing rebuilding and I'm interested in going larger for displacement. I'm well aware of being able to use my stock crank & finding a nice set of LS3 rods/pistons if able .

My question is can that be done with using stock crank, LS3 internals? My. 243's are getting the full head job at AI. And I am upgrading my cam from the TSP 224R. To something more custom give or take. If that combo doesn't work. Can I use the stock crank with a com o set of rods /pistons to achieve to out. One of a. 377? A 6.1/6.2 ltr fits what my goals are for my car. Don't plan on doing anything crazy like FI for a few years. But nitrous is a def within the year.

Thank you for your time and responses ,

gnx7

iTrader: (28)

Considering an LS3 bore is 4.065" I would say you shouldn't use LS3 pistons and overbore a 6.0 (4.0" bore) block.

Have you thought about buying a takeout running 6.0/6.2 truck motor and save machining/parts costs?

KCS

iTrader: (20)

You can use your stock LS1 crank with LS3 rods and pistons. The LS3 piston is for a 4.065" bore, which will put you at 376ci.

If you eventually plan on adding a power adder, I'd suggest limiting it to a 4.030" bore, which would give you 370ci. You would need aftermarket pistons for that bore size though.

Lord_Vaders_Hawk

iTrader: (5)

Gnx7 ya I have been thinking that route. Local junk yards don't have anything more then 5.3 motors. If you know of a site I can check out. I most certainly would appreciate it! Reason as to why I am asking this is to price out using my parts and piecing it together vs. buying whole. I'm always trying to find ways to build by budget .


KCS, power adder is definitely in the future. So I'll keep that recommendation in mind!

chevyrunner

iTrader: (4)

you can bore a 6.0 (4.0) bore to 65 over and use ls4 stuff its not that big of a thing to do or you can bore it 30 over and get custom pistons made for about 6-700..

Lord_Vaders_Hawk

iTrader: (5)

You mean LS3? I'm looking to head up to high 5 low 600 range. So I'm thinking of doing a .030 over and getting forged piston.

chevyrunner

iTrader: (4)

this post says lq9 with ls3 parts.. so im saying YES YOU CAN BORE A 6.0 to .65 over i have seen them .70 over.... .60 over is the most id go if you want to squeeze, you can easily make 500 rwhp with a 6.0 block i did it with my stroker, you can message me if your interested in the info on what i did.

you dont have to use a 6.2 block, while you can bore out the 6.2 remember its aluminum and not as strong as a iron block especially when you start to bore it out. yes you start with a larger bore compared to a iron 6.0 you start to lose wall strength as soon as you bore, the cast iron 6.0 is a better block to bore imo...

hope that helps

KCS

iTrader: (20)

You can bore the 6.0L iron blocks to 4.065". I did it and the engine is in my Trans Am.

I wouldn't do it on an aluminum LS2 though, which is why I went to 4.030" on the LS2 going into my Mustang.

Lord_Vaders_Hawk

iTrader: (5)

I'll definitely send ya a pm. I'm always interested in learning new ways to make more power. I just wanted to clarify on the LS4 thing, I figured it was a typo.

Lord_Vaders_Hawk

iTrader: (5)

Thanks for the input, is the motor in your sig the 6.0ltr? What was your build? Cam, heads etc? Power output?

KCS

iTrader: (20)

Yeah, it's in my Trans Am. It made 412whp and 433ft-lbs, but the numbers are low because of the slipping clutch. The cam is 235/235 and less than .600" lift and the heads are just 241's with a valve job and blending.

Build Thread: 376ci Iron Block

The new clutch is in and a set of 243's, new headers, and motor mounts are about to be installed as well. I've been working on my Mustang so I can send it to paint and put the TA in my garage.

Lord_Vaders_Hawk

iTrader: (5)

That's a very detailed thread! And right up the alley of what I have planned. Thanks for that! Like I stated before, my 243's are getting the full job from AI. 232cc with new Manley valves intake/exhaust . I'm wanting to build a strong set up off OEM parts for the foundation. I'm planning a larger cam if it calls for it. In your opinion, is a ported LQ4/9 to .065 still strong enough for a 150 shot?

KCS

iTrader: (20)

Yeah, I think 150 shot would be okay with a safe tune.

Lord_Vaders_Hawk

iTrader: (5)

I trust my tuner, hasn't steered me wrong yet. Thanks again for the information!