Mike96z

iTrader: (78)

Okay, im needing some help here, if I have a 5.3L and a 4.8L Vortec engine, how would I tell the difference between the two? Part number or wat? On the back of the engine it says 4.8/5.3L so wats the best way? Both have exactly the same crap on them, same heads etc. Can both be bored to 5.7?

Thanks
Mike

Tootall

iTrader: (79)

both can be bored . . . check the part number on the crank, . . . that's the only way

5.3s come with dome and flat tops now

Mike96z

iTrader: (78)

Okay well one is a 99 and Ive pulled the heads on it, they are flat, in 99 the 5.3s werent flat correct? so its obviously a 5.3L. I have another which is an 02, is there a possibility of flat pistons in that yr? I could check the crank in it bu tnot sure what to look for, if anyone can let me know if 02s came flat tops thatd be nice.

kbracing96

iTrader: (26)

in 99 and 02, there where no H.O.'s, so if its flat tops, its a 4.8 and if its dished its, 5.3. I don't believe you would see a flat top 5.3 till at least 05 and it would be an aluminum block too.

Mike96z

iTrader: (78)

Thanks for the info, so an 02 with 862s would be a 4.8?