vogun16

iTrader: (7)

ive heard that the 98 ls1 block is different then the 99 and up. does anyone know if that is true?

armyboyatc

iTrader: (29)

Yes that is true. The 99 and up blocks have a better oiling system which makes them more desireable if your going to hot rod it.

KCS

iTrader: (20)

Try the search function. It seems like this question gets asked every three months or so.

vogun16

iTrader: (7)

thanks i did a search and it heled alot. it seems the 98s have thinner sleeves but are still pretty strong, i was planning on putting 6.0 heads on it since i am boosted and it looks like i would need new valve covers since the 6.0 are center bolt, but then it looks like the water jackets on the 98 are in different spots then a 6.0? is that correct?and what head gaskets should i use? thanks!