862 casting number. heads
#1
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862 casting number. heads
Off a 2004 5.3 liter. The casting numbers are 862, does anyone know the specs for these heads? Combustion chambers. Valve sizes. Anything that would help. Wanting to see if I buy these and port and Polish them if they would be much better than my stock 4.8 liter heads off 2008 4.8. Any help would b appreciated
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So the 862's ported will definitely better than the imported 4.8's? I mean yes that makes sense LOL! Do you know anything about combustion chamber sizes? I need to get a compression ratio
#4
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You should take a look at the casting number on the heads that are on your motor. You should either have an 862 casting or a 799. If there is an 862 casting on the motor right now then obviously you have just purchased the same thing. If it is a 799 casting it is actually and LS6 head which will flow a little better then a 862 casting will once ported. 4.8l motors don't have heads specifically made for them, the runner will be same size as on a 5.3l truck head.