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Old 12-09-2005, 12:32 PM   #1
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Default How much HP can a 5.3 handle??

I was just wondering what is the most power that a stock 5.3 Bottom end is holding up to?
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Old 12-09-2005, 12:45 PM   #2
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I think some have gone into the 500-550 rwhp area, i dont think many have done that though But im not sure how much more than that.
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Old 12-09-2005, 01:21 PM   #3
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id say a good safe number is 425 rwhp...
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Old 12-09-2005, 01:30 PM   #4
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yeah, i wounldnt think it could sustain numbers in the mid 500s for long. I know f8tl's z71 according to his numbers was pushing close to 550rwhp(i believe, correct me if im wrong f8tl) that was with a gt 67 and 6.0 heads i think.
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Old 12-09-2005, 01:50 PM   #5
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Been running 450 rwhp on mine for about 30K.
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Old 12-09-2005, 10:48 PM   #6
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I am trying to pick between the 6.0 for the engine for my chevelle and the 5.3 that has 30,000 miles for 400.00
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Old 12-09-2005, 11:15 PM   #7
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I really do not know how much horse power the 5.3 / 6.0 crank can take.

the 5.3 / 5.7 / 6.0 come with the same size crank shaft, some on here and ls1tech have had 500 to 600 horses on the stock crank, so far no one has broke one yet from too much horse power, and no one has found out just how much horse power these cranks can hold up to.

the book states 550 horses, but we know that is a lie because too many have pushed far more horse power then that, I would not be surprised if the stock crank was not equal to a forged crank and can hold up to 700+ horses with no problem.
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Old 12-10-2005, 01:03 AM   #8
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For $400 I would say go the 5.3 route and spend the rest on a GT67 turbo The 6.0 has more potential for power but you are gonna spend way more trying to find one and its gonna suck down gas like there is no tommorrow.
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Old 12-10-2005, 04:18 PM   #9
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You are right Beeftip. Well as far as we can be without dyno #s

I only put about 5k miles on the setup around the 500rwhp range. The 550ish I was pushing at the track was only because I put race gas in and turned up the boost from 13-14 to 14-15.

I think what it will come down to is having good luck and getting a solid stock motor. Obviously not all are built exactly the same and some parts may be inherently weaker (flawed castings etc) than others and could give at much lower HP levels. Also the stress put on those parts by varying loads (3400lb car vs 6000lb SUV).
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Old 12-10-2005, 07:43 PM   #10
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i believe most of it comes down to the tune and also driving habits.
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Old 12-10-2005, 07:43 PM
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