87stocker

OK. I have a possibility of 2 options. Lets say all these parts are free or dirt cheap.

1) L33 short block(no heads, in this case no cam) - possible scored lifter bore(will know shortlly)
Comp XR265HR cam
Mild port 706 heads or find some 243's
Ported 78mm tb or TBSS/07+90mm Intake and t body.(I know the 90mm would be better, but I could swap it later if that doesn't fall into my hands)
LT headers.
I-6 TC (I tow a 7000lb trailer 10-12 times a year)
or

2)Iron 4.8. If L33 block is un-usable.
Take rods and crank from L33.
Comp XR265HR cam
Mild port 706 heads or find some 243's
Ported 78mm tb or TBSS/07+90mm Intake and t body.(I know the 90mm would be better, but I could swap it later if that doesn't fall into my hands)
LT headers.
I-6 TC (I tow a 7000lb trailer 10-12 times a year)

Labor is free(from me). Down time is not a huge issue(have other vehicles). Parts are free(friends) or dirt cheap(I'm a parts-man) or already own. Extras(ex. push rods,valve springs, lifters, gaskets) at cost(I'm a parts-man).


Thoughts?
Cam recommendations?

Whitecrewcab

iTrader: (2)

I would port the 706's and put 2.0/1.57 valves in them. Compression will go up even more over the factory L33. The cam choice is a great one for daily driving and towing.

silverado6.2

I would have the lifter bore repaired and use it.

69Camaro427

The aluminum blocks are around 90-100lbs lighter, but idk how long they would compare to a iron block, maybe the iron block would last 300K and aluminum 200K.

Why not get a 6.0?
I have a buddy with that cam in a 05 ss and another in an ext cab z71 same bolt ons, 3.73 gear though, but that ss has whooped his *** about 20-30 times in the past few years. Plus all that extra tq would be sweet when towing 7K

6.0

87stocker

I've thought of it. But like I say I have all the parts kicking around for most of it.

87stocker

I was also thinking that if the aluminum block is fine and its just bad cam bearings (low oil pressure), that I would sell the block for some bucks to put into mine. Hopefully making the job next to no cost.

69Camaro427

Fair enough, The 5.3L is the best of both worlds between a 4.8 and 6.0. Power plus fuel mileage, which us dd guys kinda care about. haha

87stocker

So true. Nice numbers on yours. Calculations correct you are running 335-345 hp with a tune and lt headers. Decent. For a truck that started with 285hp. You should really look into a cam. It wakes these trucks up. The heads and Intake are really choked by the cam.

GREENSIERRA

these L33 motors respond really well to mods.
I have been asked numerous times if I had a modded 6L. I always reply with no, its a little baby 5.3

87stocker

That's the fun part about this lil 4.8 with headers and a tune. I tell them to check the 8th digit on my vin. This little thing really hauls ***.