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Gen 5 pistons (5.3)

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Old 08-03-2017, 07:37 PM   #1
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Default Gen 5 pistons (5.3)

Ok, I have been looking for some time now and Cannot find the answers I am looking for. If I missed a thread please let me know.

I have a new gen3 block and I am wanting to put the gen5 flat top pistons (w/reliefs) installed on Scat I-beam rods(icr6100-927). I am building a high compression 5.3 and i was told the cam might cause PTV issues. The questions I have.....

--- will the gen5 fit correctly in the gen3 block, I have not seen any builds for it, or any info on the pistons at all.

--- do the valves reliefs allow for more PTV clearance on a 862 heads.(I don't want to assume).

Plan for the build

Gen3 5.3 block
Gen5 5.3 piston
Scat I-beam rod
862 heads (61cc)
Stock head gasket
10.5:1 compression
Carbed
Cam motion "little chopper" cam

If the clearance is there I would go to a Cometic .040 gasket and have the heads milled to 59cc, for 11.0:1 maybe a bit higher.

Thank you, I have been snooping in the shadows for some time and thanks for the forum it is full of useful info.
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Old 08-04-2017, 12:52 AM   #2
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Gen5 5.3 pistons arent flat tops.

Maybe you mean gen4? Your scat rods wont work with any ls piston. The pin is too small. They are all a .945 not .927.

Gen4 5.3 floating pin pistons will work just fine but not with those rods. Youd need a scat 26100944P for them or a 66100945 h beam.
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Old 08-04-2017, 08:49 AM   #3
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#19208675 (2010-14 Hummer) only descriptions I could find is flat top with reliefs.

Is this considered a gen 4 ?
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Old 08-04-2017, 08:51 AM   #4
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Also the part number you have (26100944p) comes up as press fit. Atleast on Summit Racing. I will try to call scat today.
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Old 08-04-2017, 10:04 AM   #6
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Thank you for the knowledge.
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