Motor Identification
 

Ive been exchanging texts with one of my friends that owns a shop (Audi Specific) about a motor he got laying around. But im a little lost on figuring out what motor it accually is. So heres what he tells me...

Iron Block 5.3
Out of a 07
243 cast heads

apparently its completely stock. never touched never opened up. so thats what confuses me.

I know the silverados and such around that year have the 5.3 with 243 heads, but I dont think its an iron block.

they are almost all iron blocks...very few have aluminum if any that I have seen.

Quick google search says Curt is right about most being iron blocks. I guess my dad got lucky with his van getting an aluminum one. More info on 5.3l block differences:

http://www.gm-trucks.com/forums/inde...pic=95383&st=0

Yeah most any that I have worked on are iron.

the aluminum blocks are very rare in the trucks, only ones I know of have been in trailblazers, Canyon(i believe) and a handful of vans/tahoe/suburbans.

They big man BiGal should be able to tell everyone what the deal is.

The SSR and some 1500 4wd pickups had them, Buick Rainier too.

Its either an LY5 or LMG if it was a flex fuel truck.

so is it a decent motor? its got 35k on it...


but hows that gunna work with the flex fuel ? the motor would be for my car...

flex fuel = cyls shut off when not needed or can run E85 or whatever ?

sorry, im not shure which one it is

Pretty sure its e85

I'm not all too familiar with it but it would be for e85. Shouldn't really affect you though especially if you are using an fbody computer. I really don't know much about the differences, if there are any significant ones.

Not 100% but I think flex fuel cars use different injectors/fuel rail

well its got 243 heads, so id be using my LS6 set up on it.


So this is what i would like to to.... Use the heads/bottem end from the 5.3, bolt up my LS6 intake on it, and use the harness out of my LS1 Car ? will the LS1 harness run the 5.3 ?

I wonder if there's actually a benefit somewhere because you have to move more E85 to make equivalent power to gas.

Yeah I was wondering the same. It's probably no difference :lol:

I'm too lazy to look this up or confirm it, but I though the FlexFuel cars would swap to only 4-cyl or something on the highway when cruising, and then when you're on the gas you get full power.

Hound BigAl for an answer.

Doesn't matter if he's using his computer. If he's using his ls1 top end, rest is negligible too. There might be a couple sensor differences though but I'm sure its doable.

Flexfuel and AFM are completely different things. One can change the tune to run e10 - e85, and one shuts off half the motor.

I say Potato, you say Active Fuel Management, let's call the whole thing off.


But in all cerealnes, I totally forgot about AFM. Good call.

wait... so 5.3 bottem end, 243 heads, LS6 intake, LS1 Computer/Harness is a work able combo ?

id imagine using the LS1 computer would make eliminate the Flexfuel stuff.... even thou it would be nice to be able to just toss some Corn in there :)

sensors & throttle & reluctor ring tooth count need to match your harness & ecm correct?

cmon guys, srs thread is srs.

i really need help knowing if this will work.

The plan as stated again...

5.3 Iron Block
243 Heads
LS6 Intake/TB
PCM/Harness/Ect from LS1 Camaro

reluctor wheel is key. what crank sensor is in the block?

i would think its got a 58x ?

no idea what crank sensor is in there... stock i would presume. both motors aparently were never touched