XxWICKEDSSxX

What is the best/lightest way to obtain an aluminum LS motor that does not exceed 5100cc? (roughly 5.0-5.1 liters)

Should I destroke an aluminum 5.3?

Are there any aluminum 4.8 liters that were ever made? How about boring or stroking one of those?

Thanks for the help. The motor is going in an f-body built for C-prepared

c6matt

iTrader: (1)

4.8 crank in an aluminum 5.3 block will give you an aluminum 4.8.. then bore it to desired displacement.. to get to 5.1 your looking at sleeving the block.

.060" will only get you to 4961cc's (or ~303 C.I.)

speedtigger

iTrader: (16)

You can get exactly what you need by putting a 4.8 crank into a 5.7 engine.

3.26 stroke and a 3.898 bore = 5.098 litres (311 cu in.)

a few resources for ya:

http://www.csgnetwork.com/cubicinchdispcalc.html

http://www.emotorcon.com/motors/Express-115

https://ls1tech.com/forums/generatio...-ls-302-a.html

c6matt

iTrader: (1)

doh! good thinking.. I had my heart on making the 5.3 work for him! lol but the 4.8 crank is the answer!

Andy1

You'll also need the 4.8 rods as well; they are longer than the 5.3, 5.7, & 6.0 rods assuming you use stock pistons. Re-balance the assembly.

Andy1

pist0lpete

iTrader: (3)

Anybody have an info on how much abuse the 4.8 crank can take? I know LS1 and 5.3 cranks are fairly proven to 800hp or more but I guess this also depends on how much power he is planning to make.

Keith

The 4.8 crank should be able to handle a lot, it has more journal overlap than the 3.622" stroke cranks. I'm pretty sure a LS1 crank has lived at 1800hp in Harlan's car.

serpentnoir

iTrader: (2)

if you believe Handzel's book, W2W made over 600hp with a turbo.

Irish350

iTrader: (14)

i wanna know what this is for

River City Speed

iTrader: (3)

Probably for some class racing. lbs/cid rules

bczee

iTrader: (12)

so.. it wil be for some form of spec or class racing. Which one ???.. only he can tell us .. LOL... SCCA ?

01GMC5.3

iTrader: (7)

I know there is a guy makin 800 wheel hp in a 4.8 RST truck on the truck side of ls1tech