DAH32

Have a LQ4 that I will be turning into a 370 with a set of hyper flat tops and LS2 rods. Truck is a daily so this is not the normal build you see here. Just freshing up the bearings and the like. Going to run 87 octane as compression will be around 10 to 1. Not looking for anything more than 375 horse maybe 400. Got to be able to afford driving this thing everyday. Thinking a LS6 cam should be on the smaller side of what I need. Dont care about lope and all that. Truck has a 6 speed out of a GTO and 4:56 gears. I use this truck to towing a trailer with a car from time to time. Trying to get by as cheap as I can. Dont see the need to spend 400 plus dollars on a valve train when I can reuse the lifters and just get a used ls6 cam and new springs and pushrods.

What are you opinions on the choice.

George C....

87 octane wont go so well with the 10.1 cr

also the T56 isnt meant to tow with so heavy loads will cause it to break

honestly for what your saying find a used low mile motor

Vortec350ss

iTrader: (20)

It will run pretty well. Take it from someone who went down this path, if you tow the LS6 cam isnt your best friend. Its a little soggy down low. A different grind will help you a lot, and they cay be made mild to fulfill the exact requirements you have better. It's a good option, but there are better to be had.

I kind of agree with George here... you are better off finding a used LQ9 in good shape.

DAH32

Interesting.

Im sorry I think compression will be closer to 10.2 with a stock chamber 317 and 0 flattop. Not sure what head gasket to use yet maybe the LS3

I dont see a big increase from the LS6 (zo6) cam from the LQ4 cam. There aint any difference in a LQ9 and LQ4 except .5 bump in compression.

Maybe just a rebuild of what is there and just replace pistons.

Machine work might set you back as much as a used LQ9. If I do the build then that is a wash on having to pay for the engine to be assembled.

Towing is very limited. Maybe towing a car two to three times a month. After that, just maybe a lawn mower in summer. No boat or anything like that.

Was looking to keep the build strong from idle to 5200 to 5500.

The build on a DCR chart with the LS6 cam which has 270/282 duration on a 117.5 lsa and I assume the ICL is 113. Comes up to right about 8.0.

Anyone have the advertised duration of the stock LQ4 cam or a LS2 cam?

Can you improve on the stock valve springs of the LQ4 cam to make it rev another 1000 rpms and get a little more power out of it?

03sierraslt

iTrader: (22)

The LS6 is not a ideal choice for towing, the higher LSA hurts it over a stock cam. Duration in the 210-218 range and a 112 LSA will make good torque. If you raise comp at all plan to run better fuel as it won't take a whole lot of timing on 87.

DAH32

This is what I figured already. Take a look at what I posted above and see what you think.

Just trying to keep a 370 strong from idle to 5200 to 5500.

Towing is minimal as you can see from the above post. Truck has a 4:56 gear with a locker.

George C....

You can find used 6.0s for 600-1200 bucks

DAH32

Right.

Depending on mileage.

I already have a good running 6.0 with close to 200,000.

I have another 6.0 that I have torn down that had a broke crank in it.

I think I could spend the money on getting the torn down 6.0 machined and putting it together for a few more dollars and have a fresh 370 with no mileage.

03sierraslt

iTrader: (22)

Spinning a stock cam past 5500 is of no advantage as power is falling off. Even something like a Isky triple 212 would work well.

DAH32

So, your saying that a improved valve spring for a stock lq4 cam to try and potentially increase power is no advantage.

Your saying a Isky cam with 212 would work well.

Question:

That cam is bigger than a used LS6 cam.

Whats the difference?