carbon04

i know the engines are basically the same (or so im told) so what exactly are the differences in the block? besides it being aluminum. will my heads bolt up to it? and would a radix kit bolt up to a ls1 (with ls1 heads, or 5.3 heads)? thanks for the help. im just trying to decide if i should go for the 6.0 or aluminum ls1.

2003blue5.7

I went to a 5.7 long block in mine... its alot of fun... your heads will bolt right up to either the 5.7 or the 6.0.

treyZ28

Let me know if you want an Ls6; I get them for around $3800. Crate, complete. TB to intake, injectors to oil pan

carbon04

how much for just a long block? no manifolds, intake, wiring, or injectors

Blue5.7 - thanks for the info, would you happen to know how much compression the Ls1's have? and would my heads give it more?

quicksilverado

iTrader: (8)

Can you get an LS1? If so, what would it cost?

Visionxorb

does that include PCM and harness? I want to put on in my 72 camaro.

treyZ28

no pcm or wirign harness but it has accessory brackets and such. check FS section. same thing only a 6.0 in that pic

treyZ28

Just LS6s and full crates

GMChasLS1

iTrader: (1)

There is one bolt hole missing for the AC compressor mounting on the LS1 from the 5.3, I think guys are just leaving it out with no problems. Your heads will bolt up to the 5.7, but I think the LS1 heads have bigger valves and the 5.3 heads will rase you compression ratio on a engine that already has high compression. If you use truck accessories, a Radix kit will bolt right up to the LS1, but you might want to use 6.0L heads to lower the compression a bit for the Radix.

ktmrider

Yes, GMCCasLS1 is exactly right. Only other differences are in the intake and water pump. Truck intakes are much taller, about 4" over an LS1/6. The water pump mounts and casting are identical except the truck model has the upper radiator hose mounting on the top of the pump housing where the LS1 has the mount on the front of the housing for the clearance issues. FYI, there was a good test on intakes in the latest Chevy Hi Performance mag that shows the truck 6.0L intake is as good as anything out there, including aftermarket. You may not need it if you go to the Radix but just in case...
Last, the 6.0L #317 heads ( 72cc ) are your best bet with the Radix/forced induction. They have the biggest chambers, intake volume, and D-shaped exhaust ports. Next best with Radix are LS1 #241 heads. Again, slightly less compression than stock truck heads due to larger combustion chambers ( 66cc ). Anything else, stay with the 5.3L turck heads ( 62cc ). More compression if you don't spray or add FI.