I know Ive read this info before, but cannot for the life of me figure out the right combination to search for it.

Im contemplating building my 4.8 into a 5.3. While Id love to just swap cranks, iirc there is more to it than that. What else is needed? Do I need the complete rotating assembly, or can I use parts and pieces from the 4.8?

If its too much BS, Ill probably just build on the 4.8 a little till I decide what Im gonna do with the "other" engine

 

I thought the bore is bigger ?

Im curious also, but there are lots of 5.3's out there for 500$ or less. ( not trying to be a smartass LOL )

 

same exact blocks...if you ever look at a 4.8 or 5.3 block they say 4.8/5.3....back to the story...same everything except stroke...different pistons different crank...

 

If I'm remembering correctly it all has to be changed. The 4.8 stroke is shorter, so either the rod is longer, or the piston pin height is different, or both.

No point in buying a 5.3, I got a 6.0 sitting on the stand, just can't decide what I'm going to do with it, and want all the supporting mods before I drop it in.
As far as building a 5.3, internal parts are cheap, and I really don't want to pull the block till I swap it

 

piston height the same. stroke/rods are matched and particular to each motor. also 4.8 pistons are flattop while most 5.3 pistons are dished. my opinion is jst play with the 4.8 while you build the 6.0. had a 4.8 in my ecsb. with cam, full exhaust, and tune, it was definately no slouch.. lol

 

All you need is the crank and rods. 5.3/LS1/6.0 cranks are all the same stroke and 5.3 and LS1 rods are the same. 4.8's do have flat tops but I'd keep them for more compression.

 

Use the 4.8 block, use the 4.8 pistons, find a cheap 5.3 crank and rods. Then you will have a flat-top 5.3. Which with the stock heads will be 10.3:1 CR vs the stock 5.3 CR of 9.5:1.... This will be a great little foundation for some fun. Then as mentioned save up for the 6 liter build. A 5.3 can get you pretty far before the stepup in cubes.. Just a thought

 

Sweet, thats what I wanted to hear, just wasnt sure.

Im not sure if Im going to go 6.0 so whatever I do with the 4.8 will probably be around for a while.

 

Yeah i wanted to do a 6.0 myself, but i have like 300.00 total in my flat-top 5.3 shortblock and my goal was 12's NA and maybe a Maggie later so i figure the little 5.3 will be plenty, plus with the flat tops you can throw some 799/243's on without milling and still be art 9.9:1 CR

 

Yep yep, flat tops, 243/799 head and nnbs/tbss intake and ull have a 24x gen 4 5.3! Lol! Go back on goir and check my build pics... i have flat tops!