ronniescamaross

just curious how many have done a similar swap, needing intake options or if i can still do a F- body intake.

FultonPerformance

doing a rebuild on a 4.8 with cam and worked 853 heads, ls6 intake and same headers, my whole top end has came off my blown up 5.7

Carolina_Ryan

Can we revive this thread?

Im looking into putting a 5.3 in a 2002 Fbody as well. Will a gen3 5.3 be a direct swap for a 5.7? I have everything I need to get the car running, short of a longblock, intake, and fuel system. If I can throw in a 5.3 for half the cost of a 5.7, Ill take the HP hit just so my car will run again.

King Nothing

iTrader: (9)

The blocks are identical. The differences in the engines are heads, cam, crank, intake, exhaust manifolds and I think the front drive accessories.

Carolina_Ryan

Great! Obviously you'd want to keep the 799s/243s that come on the 5.3.

So what are my options for upgrading the cam? Are there off-the-shelf cams for this setup?

King Nothing

iTrader: (9)

Stock for stock an LS6, LS9 or LS1 hot cam would be good choices and make more power than the stock cam in a 5.3L. If you want bigger it depends on what you plan to use the car for.

stockA4

I did a 4.8 swap on a 02' Z28 that I got with a blown up longblock so I've been there already. Don't forget that if you go with an iron truck block your going to have to drill and tap a hole on the front driver side of the block for the alternator bracket.

don't worry, it's really easy to do but it's definitely something you'll want to do before you drop the engine in the car. Otherwise everything bolts up the same.