[RMS25thta]

I got a free 5.3 engine today from a guy locally. It was blown, the block is bad. He said it was a 5.3 from his 2002 truck. I have a few casting numbers hopefully you guys will help me verify that this is a 5.3 and not a 4.8.

Block: 12567393 (says 4.8/5.3 on it)
Heads: 706
Crank: 12552218 ???

I guess the crank is the tell tale seeing that the 4.8 and 5.3 had the same bore and used the same heads but the stroke is different. The crank does say Mexico on it and the LS1/LS6 book I have says the 4.8 motors were only made in Michigan so I am thinking it is a 5.3, just hoping someone can confirm.

Also, my 02 Tahoe 5.3 has 862 heads, this motor has 706 heads, are one better than the other?? What is the difference??

Help me out if you can. Thanks.

 

[[email protected]]

How is the block bad? Cracked internally? How was this verified?

 

[RMS25thta]

#8 rod broke and put a hole in the block, I can put my finger in the hole.

 

[FarmTruk]

block and crank casting #'s are not listed at www.mortec.com...

:think:

 

[Kevin]

put a hole in the block? damn.


so... what do you plan on doing with the engine?

 

[RMS25thta]

not really sure. There are a lot of good parts. The crank is fine, heads, got all the coil packs, 7 rods are good. For free, couldn't say no. My friend owns a machine shop so lets just say I get the family discount on any machine work.

 

[maka]

put a hole in the block? damn.


so... what do you plan on doing with the engine?

He could weld a socket in the hole :hmm:

 

[FarmTruk]

According to this, the "218" crank is for a 5.3L...

http://www.enginebuildermag.com/Art...fusion_concerning_gm_gen_iii_crankshafts.aspx

 

[RMS25thta]

whatz up Maka.....hows is going tonight??

 

[RMS25thta]

thanks for the number info farmtruk

 

[maka]

whatz up Maka.....hows is going tonight??

bored.... :crazy:

 

[JennaBear]

It is a 5.3L.

 

[RMS25thta]

Thanks guys.....

Anyone know about those 706 heads???

Maka.....why bored?? nothing happenin up in NY tonight??

 

[JennaBear]

They are just the stock 5.3L heads.

 

[RMS25thta]

are the 706 heads the same as the 862 heads on my Tahoe?? what is the difference and which is better??

 

[theholycow]

He could weld a socket in the hole :hmm:

:roflsquared:

 

[Kevin]

are the 706 heads the same as the 862 heads on my Tahoe?? what is the difference and which is better??

i'm 99% sure the 706 heads are the same as the 862, but the only difference is one head was cast in a sand mold, and one in a metal one, or something like that. someone correct me if i'm wrong and fill in any missing info.

 

[RMS25thta]

will be interesting to see which one is which. thanks for the heads up