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Ls1 pistoons in a lr4(4.8) block

This is a discussion on Ls1 pistoons in a lr4(4.8) block within the Internal Engine forums, part of the LSx Technical Help Section category; I lately been toying with the ideal of running ls1 in my 4.8 block that i Have.I already know that ...

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    1980 monte carlo

    Ls1 pistoons in a lr4(4.8) block

    I lately been toying with the ideal of running ls1 in my 4.8 block that i Have.I already know that the block needs to be bored over to the size of a ls1 block which should be around 3.904 something in that range.I just came up with this idea because of a recent test that super chevy did.They had the 4.8 vs the 5.3 in a max power contest between the two.They both produced horse power numbers very close to 500hp the 4.8L produced peak numbers of 476 hp at a lofty 7,000 rpm and 392 lb-ft of torque at 5,900 rpm. Torque production exceeded 350 lb-ft from 4,500 rpm to 7,000 rpm.Both motors had a set of CNC-ported (Stage 2) heads from Total Engine Airflow. Full CNC ported, a 2.00/1.54 stainless steel valve package combined with a multi-angle valve job to produce exceptional flow numbers. The heads were combined with a healthy Crane hydraulic roller. The Crane cam offered .590 lift, a 224/232-degree duration split at 0.050 and 115 LSA. The final upgrade was the LSXRT intake from FAST combined with a 102mm throttle body. the 4.8 can put out power that has been establish.what i was thinking what if a similar combo only with ls1 pistons.Inside of the 4.8 block with modified ported stock heads(port and polished)a elderbrock victor jr intake which i currently have and the same exact cam that was used in the build.I think the out come would be great.Is anyone currently running a similar setup or ls1 pistons in there 4.8 block.

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    Most guys are building iron 6.0's. A few have swapped 5.3's into their cars with good results, but I have not seen anyone playing with a 4.8 that I can recall.

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    Ls1 pistons in a 4.8 will be no problem. The 4.8 and 5.3 are essentially the same block just one is bored out more than the other. The 5.3 can be bored out to the standard 3.898 bore in the ls1, so the 4.8 would be capable of that as well.
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    Thanks for the quick response,Thats what I was thinking that the 4.8 would be very capable of using the ls1 pistions.I do have plans for using my holset he1 turbo in this build.I just wanted the motor to be extremely efficient before the turbo boost kicks in.I do plan on head porting the heads my self as well as port matching the intake to the heads.I do know that i have a long road ahead of me.I plan on spending a week on each head to make sure that everything is neat and done correct.I am reading my port books and you tubing on head porting as we speak.My heads are the most critical aspect of my soon to be build.Im shooting for 500 hp with this motor without the turbo.I have a lot of time on my hands so i am confident that if could be pulled off.

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