Truck Motor
Thread Starter
Teching In
Joined: Jan 2009
Posts: 36
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Truck Motor I picked up an 08 LY6 long block with very low miles. Story goes it was wrecked in 08 and been sitting in a warehouse since. I want to put it in my 1 ton Jeep where I only use 1500-4500 rpm range on the trails, streets and freeway driving on 40 inch tires. It's got 823 heads, pcm, harness,a/c, starter,alt, water pump. I have up 241 heads, ls1 corvette exhaust manifolds sitting around.
Question is should I run the ly6 heads and buy a LS3 or truck intake or revert the top of the motor to ls1 parts in effort to get better low end torque and economy? The latter would require a custom tune of course. Any thoughts or ideas here? any help is welcome!
It comes with dished pistons and 9.6 :1 cr, I'm thinking I would want to raise cr to 10.5 ish to get better torque.
Question is should I run the ly6 heads and buy a LS3 or truck intake or revert the top of the motor to ls1 parts in effort to get better low end torque and economy? The latter would require a custom tune of course. Any thoughts or ideas here? any help is welcome!
It comes with dished pistons and 9.6 :1 cr, I'm thinking I would want to raise cr to 10.5 ish to get better torque.
Thread Starter
Teching In
Joined: Jan 2009
Posts: 36
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Keep the truck intake, well ya know that would probly make it simpler as far as programming and allow me to keep the vvt feature.
If anyone knows where to find an LY6 intake, LMK.
Would anyone know if the L92 intake is the same or better? The LS3 intake would look better but cost more and maybe nor as torquey?
I would like to raise the CR. maybe mill the heads and/or a .040 head gasket?
If anyone knows where to find an LY6 intake, LMK.
Would anyone know if the L92 intake is the same or better? The LS3 intake would look better but cost more and maybe nor as torquey?
I would like to raise the CR. maybe mill the heads and/or a .040 head gasket?
TECH Junkie
Joined: Dec 2005
Posts: 3,092
Likes: 11
"Keep the truck intake, well ya know that would probly make it simpler as far as programming and allow me to keep the vvt feature."
That too. Keep the VVT but if it has DOD ditch that part. The truck intake is suppose to be a tad better than the LS3 intake in all regards. Problem is that with a lot of cars there is not a lot of clearance in order to fit the truck intake.
That too. Keep the VVT but if it has DOD ditch that part. The truck intake is suppose to be a tad better than the LS3 intake in all regards. Problem is that with a lot of cars there is not a lot of clearance in order to fit the truck intake.
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For your application the truck intake would be the better option. There is a comparison of flow between the two intakes here (there are small differences between the L76 and LS3, but mainly refinements. They flow the same).
https://ls1tech.com/forums/generatio...omparison.html
But I would also retain the variable valve timing. In my truck, the stock LY6 pulls really hard from the low RPM's through about 4000-4500. Probably the range you are looking for.
https://ls1tech.com/forums/generatio...omparison.html
But I would also retain the variable valve timing. In my truck, the stock LY6 pulls really hard from the low RPM's through about 4000-4500. Probably the range you are looking for.
Thread Starter
Teching In
Joined: Jan 2009
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casias, sounds good. That is the range I'm lookin fer. I'm picking up an L92 cam and just got the heads milled .04. should be 10.5:1 scr, little more cam, now to figure out how to get it tuned. Oh and the 4l80 rebuild.
casias, didyou ever get yours tuned?
casias, didyou ever get yours tuned?
I am still running truck manifolds, so I haven't seen the need to put in a cam yet. This truck just drives real good the way it is.