Hey Guys,
I have a 2006 GMC Sierra RCSB 5.3L w/ 4L60E trans. I'm wondering if swapping in a BBC is possible. I know I'd have to modify the fuel system, cooling system, ignition system, exhaust system, but I'm wondering what else would be needed. Would I need to change engine mounts? Will the 4L60E bolt up to a BBC? Thanks Guys!

 

im gonna be the first to ask WHY?

it certaintly isnt for fuel mileage or power...

 

If it was me.... and i was going to go through all that trouble... i would make it a big Pain.... Why not put a D-max in it

 

BBC isn't worth it IMO...if you're going to big cubes go with a well-built 408 that will drop right in. All you'd have to change it the tune. And probably the tranny, I doubt the 60E would hold up for long. You'll get just as much (if not more) power, and better mileage.

 

i just cant believe we are actually saying the word mileage in the same breath as 408 and big block.... and truck for that matter

 

Mileage, you know....gallons per mile....

 

the only thing i can see it for is a show truck or bragging rights

unless you want monster power and torque in a NA motor as in 650rwhp(540BBC), but then again your could just a build up a LSX block and have that much power or more

 

Why do such a slice job on a basically new truck. Go with a LQ4 or LQ9 6.0L with a cam, tuning, stall converter/trans. mods, and other supporting bolt-ons. You would probably forget about that BBC quick.

 

 

look into the 01 with the HD conversion. that guy put a 8.1 BBC in it. he used two trucks. a HD frame and a 1500 frame to drop the 496 down in it

but like others said its pointless. you can get 427 factory cubic inchs with small block lsx