5.3 or 6.0
Thread Starter
Staging Lane
Joined: Sep 2005
Posts: 68
Likes: 0
From: columbus ga.
5.3 or 6.0 Hey everyone, I have a buddy that tells me I need to skip the 5.3 and go 6.0 so that I can run the LS3 heads. He says that I will never make 700whp with a street able turbo 5.3. I don't believe this is true. I told him that a 5.3 with rods and pistons and heads and cam will make this no problem and probably a lot more. What do you guys think, am I wrong is the expense of the 6.0 and LS3 heads really worth it? Thanks
TECH Fanatic
Joined: Jan 2022
Posts: 1,034
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From: Seattle
You will absolutely be able to make 700whp with cathedral heads if you have the right turbo. You could make 700whp with a 4.8L and cathedral heads if you wanted to. Show him any number of Richard Holdners videos where he does just that. In those equations the turbo being able to support the HP number is the key.
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TECH Fanatic
Joined: Dec 2019
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I did about 900 wheel on pump/meth on a stock 5.3 with a billet S475 with a small cam and it drove great.
I did 900 wheel on a stock 4.8 with a larger cam, some China turbos and E85, surprisingly on less boost than it took me to do it with the 5.3. Also a street car.
The right combo and tune, you could build a daily driver with a 5.3 well above 700 wheel.
I did 900 wheel on a stock 4.8 with a larger cam, some China turbos and E85, surprisingly on less boost than it took me to do it with the 5.3. Also a street car.
The right combo and tune, you could build a daily driver with a 5.3 well above 700 wheel.
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Staging Lane
Joined: Sep 2005
Posts: 68
Likes: 0
From: columbus ga.
Thanks guys I got a 5.3 for $150, thats why I want to build it. The 6.0’s are way more expensive then you've got to get the ls3 heads he wants to use. I will be running pump 93 and don't mind running meth to get where I need to be.
There's been videos on youtube where a tuner took a 200k mile 4.8, pulled it down, cleaned it up, put all the stock components back in (gapped rings, I'm sure, but still the stock rings/pistons/rods/crank), put a cam and twin turbos on it and dyno'd at over 900 rwhp. Your friend sounds like an old school thinking guy.