—Bauker™—

Just picked up an automatic ’05 4.8l rcsb on Sunday for $13,500.00. Id like to build a motor for this or maybe STS turbo it. I personally prefer the motor building route because it gives me the option of a turbo in the end if I really want. What do you all think?

While snooping around ebay I found 5.3L blocks for $75.00. Jegs has a 402ci rotating assembly for $2400.00. Or worst come to worst I could use the 5.3L crank and bore the block to a 6.0L and up the compression and use a nice flowing set of LS1 heads. My only worry is the computers in these trucks. How versatile are they? Am I beating a dead horse going this route? Looking for some opinions on making serious power. Thanks

moregrip

iTrader: (8)

put a Magnacharger Radix on it and enjoy your truck for 100K miles

—Bauker™—

Just doesn't do it for me. I'm looking for a project and something with a lot more power than a 4.8L Radix blown motor.

02sierraz71_5.3

iTrader: (2)

ask parish8 how much he got out of an FI 4.8

F8L Z71

PWNED!!!! Hahahaha


I wouldn't bother doing the 5.3L over the 4.8L. Both are good motors and the 4.8L has a better rod ratio than the 5.3L. If you are going to do any motor swap just do it right the first time and do a 6.0L block. Stroke is up to you.

Dez Racing is putting together a mean lil 4.8L STS combo which should turn some heads. It's in a RCSB truck also.

I opted for a 370ci long rod setup since I had to rebuilt the motor anyway.

Texas Terminator

there's no substitute for cubic inches. how deep are your pockets? keep in mind that your "options" of adding a power adder later on means you will spend more on it with a bigger motor as opposed to a stock motor. for example, my P1-SC would crank out 13+PSI on my old 4.8 (while it lasted) but is all it can do to make 6-7 with my new motor.

—Bauker™—

From the specs given on these motors I figured the 4.8/5.3/6.0 all derived from the same block. Am I wrong? 4.8 and 5.3 share the same bore but the 5.3 has a larger stroke, which is the same stroke as the 6.0 (and the LS1 I believe), but the 6.0 has a larger bore. So technically a 5.3 crank and 6.0 crank are the same, yes? Or did GM throw me a curve ball? So if this is all correct then a 4.8 block could be modified to a 6.0L, hypothetically speaking.

PSM

iTrader: (3)

The 4.8/5.3 share the same block, but the 6.0 has its own block

Not that I have much personal experience, but a 4.8/5.3 block max bore is 3.8ish. The 6.0 block starts at a 4" bore and safely goes up to 4.03"

moregrip

iTrader: (8)

How about a 6.0 with twin Radix's or M90's, now that's a project

Badzracing

iTrader: (12)

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