different stock heads?
Apr 18, 2006 | 12:00 PM
#1
Thread Starter
Staging Lane
Joined: Sep 2004
Posts: 70
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different stock heads?
is it true that the heads are different on some trucks, like on the 5.3 engines?
and if so, what are the differences and witch are better? i got an 03 sil head says 706 my friend has an 04 sil his says 862.
and if so, what are the differences and witch are better? i got an 03 sil head says 706 my friend has an 04 sil his says 862.
Apr 18, 2006 | 02:43 PM
#2
TECH Resident
Joined: Feb 2005
Posts: 976
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From: Edinburg, TX
Originally Posted by loco_silverado
is it true that the heads are different on some trucks, like on the 5.3 engines?
and if so, what are the differences and witch are better? i got an 03 sil head says 706 my friend has an 04 sil his says 862.
and if so, what are the differences and witch are better? i got an 03 sil head says 706 my friend has an 04 sil his says 862.
Originally Posted by Snake Eater
Did some research and from what i get the 862 are sand castings and the 706 are die castings. The 706's flow a little better due to the cleaner casting, and smoother ports.
But they are 4.8/5.3 heads.
Why are most castings 862's and ever so rarely you find a 706? Were they meant for another country or something and chevy ran out of 862's?
But they are 4.8/5.3 heads.
Why are most castings 862's and ever so rarely you find a 706? Were they meant for another country or something and chevy ran out of 862's?
Hope it helps.
btw, my truck (2003 5.3 Silverado) has 706 cast# heads while my brother's 1999 5.3 Sierra has 862 cast# heads.
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