Bigugly

iTrader: (5)

I just got a 5.3/4.8 longblock in a trade. Ive searched all day and cant find how to tell one from another. can someone help me PLEASE ??

hirdlej

iTrader: (31)

dish pistons = 5.3
flat tops = 4.8

DesertFox

iTrader: (2)

Pop off the oil pan and measure the crank shaft, that is the only way I know of to be 100% sure. The 5.3 and 4.8 used the same block casting and head casting numbers so it is hard to tell. Also, the displacement stamp that is on the 6.0 and 5.7 isn't stamped on the 5.3 and 4.8 motors. As far as i know.

Hope that helps
Josh

NemeSS

iTrader: (127)

correct
should have answered in question form like a trivia game show

Bigugly

iTrader: (5)

dammit....what to do with an overpriced 4.8

Thanks for the replys

NemeSS

iTrader: (127)

mpt70 that biotch!
ls6 intake, and 10psi

Bigugly

iTrader: (5)

What ever I end up doing its going in a 85 cutlass. I had thought about a FI setup with the truck manifolds but I have to have ac, and I dont want to be 20 k deep into it. Ill probably end up buying something else, trying to keep this on a budget

LS1MCSS

iTrader: (18)

Budget and LS conversion should never be said in the same post. It will seldom work that way.

veee8

iTrader: (40)

You can make it into a 5.7L pretty easily. 3.622 crank, matching rods with cylinders bored to match LS1 pistons. That would be a fairly cheap considering you already have the core 4.8L.

NateZQ8

iTrader: (3)

Or any other stock crank besides the 4.8 will give you a 5.3..........plus you will have higher compression with the flat top pistons.

Bigugly

iTrader: (5)

Ok budget is a relative term, I know Im not gonna get it done for 2k but Im trying to be somewhat frugal.

Im leaning towards the iron ls1 idea, with a forged rotating assembly I could make good power with a 150-200 shot.

heres a couple pics of the beast waiting for its transplant.

BaddillaK

iTrader: (13)

if you know what it came out of, the 8th letter in the vin should be t,z,b for 5.3 and v for a 4.8... but thats only if you have a vin

nobreaks254

iTrader: (50)

I'm doing a iron LS1 out of a 4.8 right now. So I vote for that. If on a budget, just get someones used takeouts for cheap. I'm using the internals leftover from my forged 383 in mine.

Bigugly

iTrader: (5)

I just got the longblock only ^^^

Any one know of a 3.898 bore stroker package?? ... 3.900 or 4.000 will either one of those cranks require clearancing of the block?

Bo185

You want have to clearance the block at all with the 4'' stroke crank.