hp or boost on gen 3 rods.
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On The Tree
Joined: Nov 2020
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There has been over 1000whp on a gen3 4.8 on a dyno. Id almost say you're better off with the 4.8. Just don't ramp any real power into it until 5500+. I ran mid 9's for a year or so on a gen3 5.3. Turned it up and went 2 8 sec passes before blowing it all to hell... 
I didn't follow the high rpm rule... but It was a super low compression deal with a cam that didn't make decent power till 5500 plus. Dished piston 5.3 with 317 heads/ls9 gaskets and ls9 cam. All the "wrong parts" according to some...
I didn't follow the high rpm rule... but It was a super low compression deal with a cam that didn't make decent power till 5500 plus. Dished piston 5.3 with 317 heads/ls9 gaskets and ls9 cam. All the "wrong parts" according to some... Trending Topics
Teching In
Joined: Dec 2022
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There has been over 1000whp on a gen3 4.8 on a dyno. Id almost say you're better off with the 4.8. Just don't ramp any real power into it until 5500+. I ran mid 9's for a year or so on a gen3 5.3. Turned it up and went 2 8 sec passes before blowing it all to hell... I didn't follow the high rpm rule... but It was a super low compression deal with a cam that didn't make decent power till 5500 plus. Dished piston 5.3 with 317 heads/ls9 gaskets and ls9 cam. All the "wrong parts" according to some...
I didn't follow the high rpm rule... but It was a super low compression deal with a cam that didn't make decent power till 5500 plus. Dished piston 5.3 with 317 heads/ls9 gaskets and ls9 cam. All the "wrong parts" according to some...LS1 Tech Stories
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Teching In
Joined: Nov 2021
Posts: 12
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yes, but he also cammed them to help keep the torque down in the lower/mid RPM range. HP doesn't kill rods, cylinder pressure does, especially near peak torque. That said, I think that 3rd gen 6.0 still had peak torque over 1200ft-lbs.
Engine dynos will spit out some super inflated numbers IMO. Or the real world numbers calculated by weight and trap are just under inflated... How ever you want to look at it.
Holdner made 910 on 10lbs with that gen3 6.0. You have to run closer to 20-25psi on a factory long block "cam only" motor to make 900ish hp in my experience. Unfortunately we don't get to see what any of Holdners "1000 hp" motors actually run in the 1/4. I think most would underwhelming...
Remember Freiburgers F-BOMB camaro? Dyno'd 1500hp at Westech engine dyno. Couldn't manage to get in the 8's with it. Trapping the same as my maybe 900chp setup at similar weights going 8.70... in an SBE 4.8 I'll add. So take the "1000+HP" westech dyno numbers with a gain of salt IMO.
Last edited by Forcefed86; Jan 13, 2023 at 09:02 AM.