i tried seaching this but nothing.........................

im considering buying a 5.3 gen III engine (these engines can be found in 98-present chevy and Gmc pickup trucks) and installing it into my 3rd gen.anyways would the install require the same mods as the ls1 swap, and are the demensions of the blocks the same and could i get away with a L98 fuel pump
has anyone done this swap or know know if it the exactly the same as the ls1 swap.

 

read up on the ls1 swap because its pritty much an identical swap.

 

ive read it but are they the same or slightly different puting in

 

Everything is the same as an LS1 swap. The trucks came with a different taller intake manifold dubbed as "big ugly". Although it flows pretty good you may opt for the sleeker LS1 or LS6 intake. Either or is compatible. The Gen III 5.3's had iron blocks which made the engines a little bit heavier than their aluminum brothers. I can't remember if any of the 5.3's came with iron heads but I don't think so. The aluminum ones are great heads and many LS1 guys opt for them over their stockers. You may want to keep your eyes peeled for a 6.0 truck engine. There were two versions though and you should opt for the one with the aluminum heads (found on 345hp trucks and caddilac trucks). It may have the same price tag and you get a few more cubes out of it. Either motor can make gobs of power.

 

I belive all ls heads are aluminum. The 6.0 caddy heads flow the same numbers as ls6 heads. The only difference with the 6.0 heads is they have a bigger combustion chamber. Personally I would keep my eye out for a 6.0. Also I know this is off subject but have you seen the new Impalas. The come with an all aluminum 5.3 with ls6 heads. Also the motor sits transversly. Think how sweet the thing would be with a 427. Can you say sleeper.

 

the only ls head that is iron came on some of the later 6.0's I know because that was the longblock mine was built off of . also, you need to find a car oil pan and car accessories to run with . the truck pan is too low and will hit and the truck accessories sit too high if you go with a ls1/6 intake. these are some of the basics you wil get into before you do this. also the 5.3 asks for the same fuel pressure that a 5.7 and 6.0 asks for so a new pump is needed.

 

thanks for clearing that up
is there any way to not have to buy te $200 fuel pump and could i just get one out of something in a junk yard or could i run a L98 pump i believe the engine requires 53 psi could i find a pump like that in a junk yard .

 

You can buy a walbro pump that will support any Gen III mill for less than $100 to your door.