Wristpin height 4.8 vs 5.3?
12-27-2008, 07:23 PM
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Wristpin height 4.8 vs 5.3?
picked up an L33 5.3L block+caps for a project motor to build. I found a brand new set of 8 replacement 4.8L pistons for really cheap. the aluminum block is going to stay the same bore at 96.01mm (+/- a few thousandths after a hone) and heads are going to be virgin 5.3L heads. I'm wondering if the wrist pin heights are the same between the 4.8L and it's 6.278" rod and 83mm crank vs the 5.3L and it's 6.098" rod and 92mm crank, so I can use the 4.8L pistons in the 5.3L block. 5.3L rotating assembly.
12-27-2008, 09:37 PM
#2
I don't remember how much different they are but they're different. Might be able to use them with some custom length rods. I think this subject has come up on here before. I think the cost of the custom length rods would be too much. Might as well buy a set of new 5.3 flat topped pistons.
12-28-2008, 07:20 PM
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So I'm supposed to build a motor off of this kind of info?
Does anyone have first hand experience with using 4.8 pistons in a 5.3 or vica versa?
I don't remember how much different they are but they're different.
Crap I could be wrong
Might be able to use them with some custom length rods.
They are pretty much the same piston
i was going to do this, but last time i was told they were different, but now im hoping that was wrong
12-28-2008, 08:28 PM
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Ok, this is been covered before.
4.8 stroke: 3.27
4.8 rod : 6.276
4.8 deck height: 9.240
5.3 stroke:3.62
5.3 rod: 6.098
5.3 deck height: 9.240
Now do the math: the centerline of the cank is half the stroke of couse and the deck height is measured of the centerline of the crank.
3.62/2=1.81
3.27/2=1.635
5.3:
1.81+6.098=7.908
9.240-7.908=1.332
4.8:
1.635+6.276=7.911
9.240-7.911=1.329
So yes, they have the same pin height, give or take a few decimal place rounding in my numbers.
4.8 stroke: 3.27
4.8 rod : 6.276
4.8 deck height: 9.240
5.3 stroke:3.62
5.3 rod: 6.098
5.3 deck height: 9.240
Now do the math: the centerline of the cank is half the stroke of couse and the deck height is measured of the centerline of the crank.
3.62/2=1.81
3.27/2=1.635
5.3:
1.81+6.098=7.908
9.240-7.908=1.332
4.8:
1.635+6.276=7.911
9.240-7.911=1.329
So yes, they have the same pin height, give or take a few decimal place rounding in my numbers.
Last edited by TurboGibbs; 01-17-2009 at 10:50 PM.
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12-29-2008, 12:00 AM
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