LM7 on 2003 astro cargo 2WD

LM7 on 2003 astro cargo 2WD

Postby astromstro123 [OP] » December 2nd 2015, 11:25am

wtssuuuuup astrosafarians im new to the site. i just got my astro. its a 2003 astro cargo 2WD. i live in Southern Cali just recently talked with a carb referee.i told em i wanted to get an LM7 from a 2005 2007 silverado to pit in my astro and he said it was legal so im super excited. the thing is ive never done anything close to an engine change. so where the hell do i start so that i can do this right the first time? the ref i spoke with said my astro pretty much has to be a silverado when i open the hood.
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Re: LM7 on 2003 astro cargo 2WD

Postby Sailing_Faith » December 3rd 2015, 5:38pm

Does an LM7 do the shut down every other cyl thing?

It would be amazing to get 30mpg on the hwy!
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Re: LM7 on 2003 astro cargo 2WD

Postby DRZ » December 3rd 2015, 7:07pm

I thought the LM7 or even better the L33 Silverado motors would be an easy swap for our 2WD Astros until one of our members had to modify the dog house to clear the truck style "intake". The Silverado DOES have the correct oil pan for a 2WD swap, the truck wire harness has the computer on the left same as our Astros to save the 180 wire splices it took to get the LS1 from a Trans-Am to hook up in my '98 Astro. You will have to clearance the frame slightly to clear the A/C compressor. I would recommend getting the engine with the correct transmission also rather than mix and matching any more than you have to. On my '98 I had to remount the coil pacs above the intake as there wasn't room in the stock location due to the tight fit at the dog house opening in the van floor. I made the engine motor mounts myself and the stock V6 frame motor mount location is fine.
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Click on one of the pictures and it will take you to some of the photobucket pics that Mike saved from my album. Clicking on the arrows lets you see the rest. This shows the LS1 intake which clears everything.
Get your engine as a "Dropout" which includes everything to make it operate in any vehicle and don't be fooled with low prices on just an engine. The cost of swapping that way ends up costing more and makes the job way harder.
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Re: LM7 on 2003 astro cargo 2WD

Postby DRZ » December 3rd 2015, 7:28pm

Sailing_Faith wrote:Does an LM7 do the shut down every other cyl thing?

It would be amazing to get 30mpg on the hwy!

I think the LM7 that does the shutdown thing is renamed the L59. Wouldn't bet the ranch on that tho.
The LM7 comes two ways, with a cable throttle body or the drive by wire deal. I only have used the cable style myself so have no advice on the electronic system.
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Re: LM7 on 2003 astro cargo 2WD

Postby DRZ » December 3rd 2015, 7:47pm

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Re: LM7 on 2003 astro cargo 2WD

Postby astromstro123 [OP] » January 6th 2017, 7:38am

can i get a 5.3 from one of the newer trucks?? also can i get the ecm seperately and is it a good or bad idea??
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Re: LM7 on 2003 astro cargo 2WD

Postby chevymaher » January 6th 2017, 1:19pm

astromstro123 wrote:can i get a 5.3 from one of the newer trucks?? also can i get the ecm seperately and is it a good or bad idea??

I would get the ecm with the motor. It is there and you need the wiring and ecm.
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Re: LM7 on 2003 astro cargo 2WD

Postby WoodButcher » January 6th 2017, 3:47pm

astromstro123 wrote:can i get a 5.3 from one of the newer trucks?? also can i get the ecm seperately and is it a good or bad idea??

You want the motor, trans and all the related harness and computers for that motor, "turnkey" is what they call it I believe. Unless your a top dog mechanic and understand all the systems and can build each part of that given motor from scratch it is the only way to go.
As it is you'll have modifications to make as DRZ pointed out so why add more complications if you don't need to?

I went the easy road with my '93, same year and type of intake / ignition just 2 extra cylinders.
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Re: LM7 on 2003 astro cargo 2WD

Postby AstroWill » January 6th 2017, 4:54pm

astromstro123 wrote:the thing is ive never done anything close to an engine change. so where the hell do i start so that i can do this right the first time? the ref i spoke with said my astro pretty much has to be a silverado when i open the hood.


Well, as a first time swap, I would highly recommend getting the same year van engine, it's so much easier.

If you are willing, anything can be made to fit, but there are a lot of vehicles that get sold as 'project' vehicles, just because they got in too deep and never finished.
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Re: LM7 on 2003 astro cargo 2WD

Postby DRZ » January 6th 2017, 10:17pm

It seems the stock LM7 inlet manifold won't clear the "dog house" so I bought a LS1 manifold from eBay because I know that one clears with no problems. It looks like I will have to use the LS1 water pump or modify the upper hose outlet to clear the now lowered Throttle body.
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Re: LM7 on 2003 astro cargo 2WD

Postby astromstro123 [OP] » January 7th 2017, 8:09am

is there such a thing as a rebuild manual for the 5.3l lm7 that has visual aids on what parts belong on the engine and where they go, all the wiring circuits?? can i get one at a dealer?? whats a good guide to rebuilding one of these engines?? or is it require me many years of experience to rebuild one of these?? tearing one down isnt a problem but i really want to be able to put one back together the right way. and i dont wana just take it to someone ao they can have all the fun.

thanks
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Re: LM7 on 2003 astro cargo 2WD

Postby Master slacker » January 7th 2017, 2:28pm

No Astro. No Safari. Just dreams.
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