ive been kicking this idea around for a while. i was thinking about getting e reasonable 3rd gen and swapping either a 6.0 or an 8.1. i figure the 6l swap would be pretty straightfoward, but im not sure about the 8.1l. its said its a ls configuration motor but i dont know if its the same size as the ls1. does anybody know, has anybody tried it or thought about it. it seems to me a very interesting prospect and would at least definitly be unique. also where is some good info on the 8.1 liter, compression, wheght and such. me being a glutton for punishment it would eventually get turbod probally.

 

the 8.1 is a bigblock with new style modifications, the 6litre is still based on the ls1 and all ls1 stuff can be swapped

 

this would be the same as a big block swap.. not easy.. do a search

 

The 6.0L is just an iron block LS1, so just look at the LS1 swap threads about this one.

 

I have a iron block 6.0 ls1 in my car

 

how that 6.0 go? pretty good i bet. im not really interested in doing a bog block swap, i had just thought that the 8.1 might by nearly the same size as an ls1 because its said to be based on the same motor and i had heard different thing on the net about it size wise that is.

 

I know that using the iron 6.0 block instead of the factory aluminum 5.7 block is popular with alot of the 4thgen guys with VERY fast cars... its a stronger block, and its bigger too.

 

I have an 8.1L n an 01' 2500HDI have done alot of search to modify it without much luck. It is an LS18 and i know that some parts interchange to,not with but to, the 6.0 We have taken the injectors and throttle body off the 8.1 and put them on a 6.0. The engine and trans combo in the trucks (8.1L and Allison 5 spd) is a killer combo. I have 110,000 on my truck and no real probs so far,crank sensor is all I've had to replace. I am putting this combo in a 48' Chevy Truck soon and will be glad to share the results. The best performance parts I've found is for marine app's, mercruiser uses it.