Scream

iTrader: (6)

I've been looking at that poor, lonely 4.8 just wasting away on the engine stand and started doing some thinking....

I've done a search, but have found some differing opinions on the matter. I've seen where one person went 0.120-over on the 4.8/5.3 block to the stock LS1 3.899 bore--even to the point of running BIG boost and BIG shots on it, with no problems (as of that post anyway, I think it was RECKLESS?) I'm assuming that the 4" stroker crank will work in the 4.8/5.3 block, which would make for a 382. Is it really safe to go 0.120-over on these blocks?

I mean 0.060-over and the 4" crank would still yield 370 cid, which isn't that bad at all.

Would it really be that much cheaper to start off with a 6.0L block, and get 400+ cubes, than to settle for the limits of the 4.8/5.3 block?

Deckhand

iTrader: (1)

or keep the short stroke of a 4.8, run a big bore. and rev the crap outta it

ThunderZ28

iTrader: (7)

Scream

iTrader: (6)

Interesting thought. 0.120 over w/ the stock 4.8 crank would be 312 cid.

onyxsilverado

i'm wondering the same. i saw the conversations about that engine...i'm wondering why more people don't do it if it's safe?

mudz5.3

O1 Are you trying to say something??? Did you throw an 8.1 crank in that little 4.8 of yours? j/k before a noob gets a hold of this thread.
Wouldn't it be cheaper to just start out with a 6.0 block? I don't think the high revver would be ideal for our trucks, but thats my .02

Scream

iTrader: (6)

I guess that's my question--would it be worth the extra $$ to start off with a 6.0 if you already have a 4.8/5.3 block, and if the extra cubes would really be worth the extra money.

Is the 6.0 block inherently better than the 4.8/5.3 other than being able to take a larger bore?

Just "bench-storming" here. Not really looking seriously at doing anything with the motor, just thinking.

mudz5.3

Well you know how they say there's no substitute for cubes.

onyxsilverado

granted. but couldn't you still make a decent motor out of it? i ask because i have a 5.3 sitting on the garage floor collecting dust that i'm starting on, and i'd like to know if it is possible to bore .120 over safely.

taqwache

i have heard of plenty of people that bored it out that much. just get it sonic checked first, just to be safe.