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Old 12-23-2009, 08:23 AM   #71
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Casting Number 706
Head: 1999+ LR4 4.8 Litre Truck
1999+ LM4 /LM7 5.3 Litre Truck
Material: Aluminimum/Iron
Part Number:
12559852
12561706
Combustion Chamber Volume: 61.15cc
Compression Ratio: 9.5:1
Intake Port Volume: 200cc
Exhaust Port Volume: 70cc
Intake Valve Diameter: 1.89 inches
Exhaust Valve Diameter: 1.55 inches

9.24” deck height

6.125" con. rod

-15cc DISH, 3.903 bore, 4.00 stroke
or
-8cc DISH, 3.903 bore, 4.00 stroke
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Old 12-23-2009, 09:41 AM   #72
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Quote:
Originally Posted by mudseeker View Post
Casting Number 706
Head: 1999+ LR4 4.8 Litre Truck
1999+ LM4 /LM7 5.3 Litre Truck
Material: Aluminimum/Iron
Part Number:
12559852
12561706
Combustion Chamber Volume: 61.15cc
Compression Ratio: 9.5:1
Intake Port Volume: 200cc
Exhaust Port Volume: 70cc
Intake Valve Diameter: 1.89 inches
Exhaust Valve Diameter: 1.55 inches

9.24” deck height

6.125" con. rod

-15cc DISH, 3.903 bore, 4.00 stroke
or
-8cc DISH, 3.903 bore, 4.00 stroke
Are the parts #'s to your build? Is it my understanding the 4.8 and 5.3 use the same heads? Which would mean compession ratio is obviously decided by the cc of the piston dish since 4.8 and 5.3 have the same advertised compresssion ratio. Good info to know. So someone knows all they have to do to convert a 4.8 is change the crank.
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Old 12-23-2009, 10:03 AM   #73
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see post #75

Last edited by mudseeker; 12-23-2009 at 10:46 AM. Reason: oops
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Old 12-23-2009, 10:30 AM   #74
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Are you saying they use the same crank too?
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Old 12-23-2009, 10:44 AM   #75
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bah, i had it backwards......

4.8L
The 4.8L crankshaft is an iron crankshaft with 2.1” rod journals and 2.65” main journals. The stroke is 3.267” and is designed to work with a connecting rod length of 6.275”. They started out with a 24-tooth reluctor wheel and this was used through the 2007 model year in the classic 800 series trucks. However, in 2007 starting with the 900 series full size truck, they were changed to the 58-tooth reluctor wheel.
5.3L-6.0L-6.2L
The crankshafts used in these engines are iron, with 2.1” rod journals and 2.65” main journals. The stroke is 3.622” and is designed to work with a connecting rod length of 6.100”. They started out with a 24-tooth reluctor wheel, but changed to a 58-tooth reluctor wheel in 2006. Each engine has a specific part number for it’s crankshaft due to balancing differences of the piston weights.
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Old 12-23-2009, 10:57 AM   #76
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Quote:
Originally Posted by mudseeker View Post
bah, i had it backwards......

4.8L
The 4.8L crankshaft is an iron crankshaft with 2.1” rod journals and 2.65” main journals. The stroke is 3.267” and is designed to work with a connecting rod length of 6.275”. They started out with a 24-tooth reluctor wheel and this was used through the 2007 model year in the classic 800 series trucks. However, in 2007 starting with the 900 series full size truck, they were changed to the 58-tooth reluctor wheel.
5.3L-6.0L-6.2L
The crankshafts used in these engines are iron, with 2.1” rod journals and 2.65” main journals. The stroke is 3.622” and is designed to work with a connecting rod length of 6.100”. They started out with a 24-tooth reluctor wheel, but changed to a 58-tooth reluctor wheel in 2006. Each engine has a specific part number for it’s crankshaft due to balancing differences of the piston weights.
Whew, OK cool. Boy did you have me feeling awful dang stupid for a minute there.
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Old 01-06-2010, 02:59 PM   #77
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Old 01-06-2010, 03:30 PM   #78
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Well I think somone is sure stimilating the economy one part at a time Those are some clean looking pistons.
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Old 01-06-2010, 07:09 PM   #79
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jut wait til he shows you pics of them melted down.
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Old 01-06-2010, 07:15 PM   #80
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i don't break every toy i get.............
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