I've not seen a 5.3 engine and would like some info please.

Is it the same block casting as 5.7 LS1?
What is it's bore and stroke, does it use same crank as LS1? Or does it use same pistons and less stroke with longer rods?

Thanks guys.

5.3 specs:
325 cubes
3.78 bore
3.622 stroke<same as ls1>
6.098 rod length<same as ls1>
1.890 intake valves
1.551 exhaust valves
stock comp ratio 9.5

Thank you YellowLS1truck for the info. Do you happen to know if it's the same aluminium block but with thicker sleeves? |

Nope, Iron block.

Dratt, so it's only the LS1/6 which have the aluminium blocks then, the rest being truck or pick up motors?

yES BUT DONT DESPAIR i believe 5.3 aluminum block will be coming in SSR pick ups.And Cadillac CTS is coming out with v8 option that im told will be 5.3 and that should have aluminum block also!

It's definitely coming, it'll be in the Trailblazer - here and there's some info here

Thanks guys for the info and link. I am looking for the best option of making a maximum of 5.0 litres with an aluminium block. For now it looks like mods with the 5.7 block and maybe sleeve it down.

Hey everybody i just bought a 99 5.3 with 81,000 miles on it with all acces for $450 and with about $2000 more to spend i was looking for good spending advice. This motor is going in to my 67 camaro. Oh yeah i will definetly be going wit a carb set up so -$1000 for carb,intake,and ignition and 6.0L flex plate + spacer bolts and cup some filing required.. springs? cam? pistons? Thanks

Holy Bump from the dead..... Start a new thread of your own.