GMCSIERRA5.3

whats the difference? and i ask because im about to buy a 6.2 from a supposebly 2010 denali but to my concern i thought all denalis had 823 heads but the motor there selling me has 821 heads..just wondering whats the difference and what trucks came out with the 821s..heres a pic of the motor

62nalide

iTrader: (1)

the 821s arent those LS3 heads

62nalide

iTrader: (1)

From what I understand there is no real difference in the 821 and 823 other than valves and springs. can someone correct me?

GMCSIERRA5.3

So the motor is from a camaro? Lol or what truck carrys 821?

62nalide

iTrader: (1)

821s come in the LS3s ive never heard of factory 821s on a L92 but judging by the pic its a L92 hmmmm either way both are good in my book

GMCSIERRA5.3

How would u know its a l92? Lol well he said it was an.l92 but its wierd cuz it has those heads hopefully some other member.chime in

62nalide

iTrader: (1)

This is the L92 intake
http://www.proheads.com/webshots/l92...92exteroir.jpg

and this is the LS3
http://image.motortrend.com/f/946272..._manifold+.jpg

lsx408

valves are the difference

62nalide

iTrader: (1)

thanks, i was thinking the valves and springs good to know!

GMCSIERRA5.3

So how do I order a cam kit?? For l92 heads or ls3 heads..but dam I would think the springs would be the same