I'm aware that you will need custom rods, and or pistons. But would it be worth it? I like to use as many factory parts as possible, I'm not sure why I'm like that. What are your guys opinions?

Thanks.

 

if im not mistaken the 4.8-6.0 is the same crank and the 5.3 and 6.0 have the same rods but the 4.8 has different rods but NO you would not need custom pistons or rods

it has been discussed before a couple of times and most have decided in wasnt worth it

 

4.8L crank is 3.268"
5.3L/5.7L/6.0L crank is 3.622"

You could use the 4.8L crank, 4.8L rods and 6.0L pistons.

 

Why? Wouldn't you get less cubic inches and less compression and make less power?

 

Doing it for the shorter stroke. Yes it would be smaller but short stroke engines rev like Hell. The 6.0 bore with the 4.8 stroke would yield a very rev happy engine. Not sure on what rod length to use though.

 

building the next chevy 302. good idea. would have to find a 12grand tac. tho

 

4.8L rod is 6.278"
5.3L/5.7L/6.0L rod is 6.098"
7.0L rod is 6.067"

Compression height for the 5.3L/5.7L/6.0L is ~ 1.33"


FWIW, the Caddy CTS-V factory team used the 4.8L crank in the LS7 block to make 350 cubic inches.

 

I think that motor would REV to an easy 10 grand. do it. hell we will all be able to see the results then.

 

My advise... do some heavy reading on stoker / short stroke theory. The gains of a short stroke motor at 9K rpm are not significant when compared to a longer stroke motor at 6500.

Pick up "how to build BIG INCH chevy small blocks" buy Graham Hansen. Summit i believe has it. The first half of the book is all engine theory. It goes into cylinder wall friction zones, rod deflection, all that, and you start to realize that A: you aren't going to get the power that you thought you were, and B: you need a valvetrain that can support upwards of 10K to get anything out of it.

Besides, if its top end power that you want, its easier to get a 6.0L to rev to 8K than a 4.8L to 10K. And you get the added nut busting torque of the 408 stroker down low. what more can you ask for.

I looked into it all...wide bore, short stroke, centrifugal blower, N20 boost cooler = killer combo...at 11000RPMS. I would have spent more one a valvetrain than I did on the car. AndI still wouldn't have touched 1000hp.

Now with a 427, on the same set up, you get rediculous HP gobbs of torque and a small n2o shot will put you close to 1000HP.

Thats all assuming your goals are high hp.

just my .02

 

The only good reason for destroking an engine is to gain an advantage in a displacement limited racing class.Everyone seems to think that a boss 302 or Z28 302 engine was a magic formula,when the truth was that TransAm class rules called for a 5 liter maximum displacement.Destroking a 6.0 is a waste of time for a street motor.