5.3 Head questions
03-23-2009, 07:00 AM
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5.3 Head questions Are all 5.3 heads the same with regard to I & E sizes? Combustion Chamber CCs? Casting #s? What seems to be the max safe valve lift with flat top pistons @ 112 LSA? Flow #s seem to be the same as #s for 5.7 #853 heads with the larger intake valve. Am I reading that correctly?
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03-23-2009, 01:44 PM
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If we're talking stock heads, heres what you get.
Casting Number 706 and 862
Head: 1999+ LR4 4.8 Litre Truck
1999+ LM4 /LM7 5.3 Litre Truck
Material: Aluminimum
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
Casting Number 706 and 862
Head: 1999+ LR4 4.8 Litre Truck
1999+ LM4 /LM7 5.3 Litre Truck
Material: Aluminimum
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
