OK, say I want to go outside the LM7 I currently have.

Can someone give me the RPO codes for aluminum 5.3's that I could use? Then, the alum. 6L?

Which would be compatible w/. Gen3 LS's?
Which are Gen 4?

And, all that I need to convert would be what? I know SD sells some sort of conversion, IIRC, ~ $315.

Oh, & if this make it any more difficult, it needs to be compatible w/. my Radix. I'm not updating that, so the heads must jive.

 

why you feel the need for a alum block all the sudden? Dont think they are that much lighter iirc. If i were you id look for a decent used alum ls1 short block and just switch all your stuff over and be done with it..

 

Just wondering & a-thinkin. I figure they gotta be 60# lighter if that's what you're sayin. Maybe 100# is too much of a difference to be an accurate number.

 

I'm curious as well, I've heard they're around 70 Lbs. lighter or so. I'd like to know the official weight differences because that may dictate me scooping an LS1 for my motor as apposed to an iron block 6.0L.

Fastnblu, have you gotten any Radix numbers or kills yet? Just curious!

 

For some reason 80ish Lbs is what pops in my head, either way just take that bed cover off and you're ahead of the game by that much without all the work..

 

Check out this link I think it has what your looking for.

http://en.wikipedia.org/wiki/GM_LS_engine

 

Get that Radix on, and you won't worry about the 70ish pounds. The torque will take care of it.

 

get the radix on and then see how much faster you want to go. The 112 is better suited with the 5.3 you have....and it would only be worth going alum if you went 6.2 with gen IV heads that would not fit your radix...but if you sold the radix you could build an alum gen IV NA that would run close to the radix. My set up is faster than a out of the box radix 112.

oh yea TOM, when can you hit milan?? we need to hit the track again...sooner b4 it gets hot.

 

If I was in your shoes Tom, I'd go with an LS2... keeps cathedral heads and more displacement, and aluminum.

 

But he would need an early gto or vette LS2 to have th right reluctor wheel, those are really hard to find