Zeppo

i recently had the bright idea of possibly boring out my 4.8 to a 5.3. just wandering if it would be worth it? would it make a big difference or really change much at all? and would it be cost effective?

2007chevy5.3l

iTrader: (21)

I think a 4.8 and 5.3s share the same bore size, its the stroke thats different.

03chevyroyce

iTrader: (2)

get a crank and rods and throw them in. should pick up like 30 or 40 horsies maybe

Bluchevypick

iTrader: (65)

You can always bore it out and get a 5.3 crank and some 5.7 rods and pistons and have an iron ls1

BlownChevy

iTrader: (20)

How about 5.7 pistons and 4.8 crank

454navyss

iTrader: (46)

short stroke, big bore, it will turn rpms like nobodys business.

can a 4.8/5.3 block be bores to a 4" bore? if it can you could use 6.0 pistons and 4.8 crank

MARK3406E

Nope sure cant. Well not and keep the reliability.. The cylinder walls get to thin.

PathfinderJr

iTrader: (6)

Gotta use a 6.0 block, but some folks have talked about wanting to do that. It'd basically be an old school 327. These engines rev pretty quick anyway, so unless you're building for a specific race series with a cubic engine rule, I'd probably just stick to the stock 6.0 internal dimensions. Would be cool to see though, especially if you put an L92 top end on it.

Zeppo

i really need 2 pick up on bottom end, so would a 4.8 crank with 5.7 piston work?

03chevyroyce

iTrader: (2)

if you bored it out, then yes the 5.7 pistons would work. but if you want more bottom end, why dont you do the easier thing and swap gears and get a good tune?