Billy Stop posting broken links...

 

Standard 4.8/5.3 heads. As mentioned The search button will help you find what your looking for. Some times it takes a little time but it's usually out there.

 

Whoops...WTF?

 

They were all being sarcastic when they said 862 heads are rare, You made it seem like you couldnt find info cuz they are so rare..

 

yeah i know...but my stupid comeputer not bring nothing up on them....nothing i want...

 

Tech Only section. Titled "Head Casting Info". Its been Sticked... covers all gen 3 cathedral port heads.

 

Here is the thread link.

https://www.performancetrucks.net/fo...d.php?t=434396

Snippit from that Thread:

"Casting Number 706 and 862
Head: 1999+ 4.8L / 5.3 Liter Truck
Material: Aluminimum
Part Number:
12559862
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

Stock Head Flow Numbers
Chamber 61.15 cc----0.100--0.200--0.300-- 0.400--0.500---0.550---0.600
Intake 200 cc----------63 ---128----179-----210----218----221-----226
Exhaust 70 cc----------54 -- 93 ----121----145-----163----168----174


What you need to know:
These small combustion chamber truck heads offer no advantage over an LS1 head except the smaller combustion chamber. This along with milling of the deck surface will allow a slightly higher compression ratio to be achieved. Because of the smaller intake valve installed in these heads a valve upgrade is practically mandatory."

 

why dont you step up to some better heads, rather than the stock ones

 

im looking at genx 205 heads for the 5.3.....2000 tho:/