project nose bleed (383 build) - Page 8

mudseeker · 12-23-2009, 08:23 AM

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

hotrodpc · 12-23-2009, 09:41 AM

Quote:

Originally Posted by mudseeker

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.

mudseeker · 12-23-2009, 10:03 AM

see post #75

hotrodpc · 12-23-2009, 10:30 AM

Are you saying they use the same crank too?

mudseeker · 12-23-2009, 10:44 AM

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.

hotrodpc · 12-23-2009, 10:57 AM

Quote:

Originally Posted by mudseeker

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.

mudseeker · 01-06-2010, 02:59 PM

Crmzendrgone · 01-06-2010, 03:30 PM

Well I think somone is sure stimilating the economy one part at a time

Those are some clean looking pistons.

bradrhale · 01-06-2010, 07:09 PM

jut wait til he shows you pics of them melted down.

mudseeker · 01-06-2010, 07:15 PM

i don't break every toy i get.............

12-23-2009, 10:03 AM	#73
mudseeker Senior Moderator Join Date: Feb 2006 Location: michigan Posts: 7,155	see post #75 Last edited by mudseeker; 12-23-2009 at 10:46 AM. Reason: oops

12-23-2009, 10:30 AM	#74
hotrodpc Senior Member Join Date: Jul 2008 Location: OK Posts: 6,932	Are you saying they use the same crank too? __________________ *Winners NEVER Quit , Quitters NEVER Win !!!*

01-06-2010, 03:30 PM	#78
Crmzendrgone Senior Member Join Date: Apr 2009 Location: Arizona Posts: 3,167	Well I think somone is sure stimilating the economy one part at a time Those are some clean looking pistons. __________________

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12-23-2009, 08:23 AM	#71
mudseeker Senior Moderator Join Date: Feb 2006 Location: michigan Posts: 7,155	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

12-23-2009, 10:44 AM	#75
mudseeker Senior Moderator Join Date: Feb 2006 Location: michigan Posts: 7,155	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.

01-06-2010, 02:59 PM	#77
mudseeker Senior Moderator Join Date: Feb 2006 Location: michigan Posts: 7,155

01-06-2010, 07:09 PM	#79
bradrhale Senior Moderator Join Date: Apr 2006 Location: Texas Posts: 9,512	jut wait til he shows you pics of them melted down.

01-06-2010, 07:15 PM	#80
mudseeker Senior Moderator Join Date: Feb 2006 Location: michigan Posts: 7,155	i don't break every toy i get.............