blwn327

can you tell me if this casting is a 5.3 or 4.8??? thanks!

NO-OPTION-2002

iTrader: (2)

Hello,

This was supplied on either 4.8L or 5.3L and will work on either.

Hope this helps!

blwn327

so they are the same exact head?? just want to make sure ..it is for a friend and I have these that came is a core at work...he wants the 5.3 heads. Thanks!

ktmrider

Both are exactly the same, no differences at all. My 99 4.8L had them as do all the other 4.8/5.3 motors I have looked at.
Might save you some money if someone thinks the 4.8L heads are not worth anything...

mrr23

iTrader: (3)

862 are 4.8L heads. i just put them on my wife's 99 formy. https://ls1tech.com/forums/generation-iii-internal-engine/209140-vhp-heads.html

ktmrider

Not specific to the 4.8L. BOTH the 5.3 and 4.8 have the 862 castings. Check out the sticky note above for "Head Volume..." for more info.

mrr23

iTrader: (3)

well he asked if the 862 was for a 4.8L or 5.3L. on the 862 heads i have, you flip them over and you'll see 4.8L cast into the head under an intake runner. but yes, it's for both motors.

taken from here: http://www.pera.org/CoreTalk/eb120317.htm
The cylinder head for both engines is aluminum with a casting number of 862, however on the deck face area in a small cavity there is a 4.8 cast onto the cylinder head. Do not be confused by this cast number for the cylinder head is for both 4.8L and 5.3L engines.

crazyhorse

anybody know if 4.8 heads can be upgraded for better performance and flow or are they not worth the time or money?

RIDINFILTHY

iTrader: (10)

i would say they are the same head

mrr23

iTrader: (3)

man this is an old thread.

anyways, my 862 heads were ported through www.vincihighperformance.com and 2.02/1.60 ferrea valves were put in.

here's the flow sheet.

ktmrider

Most/all the performance shops start with the 862 castings and port/CNC from there. They have more "meat" in the combustion chamber ( different CC for smaller 4.8/5.3 bore ), always easier to remove material than add.
Long story short, the 862 casting is great once you work them over a bit.