hello i'm new to this forum i really like lightnings i'm looking into buying one
what's the maximum hp an L could have?

 

one meeeeeelllion horsepower.

but seriously, what are you looking to do, stock block, built block?

stock blocks are limited by the fuel system around 500 RWHP ,and MAF voltage maxing out around 450-475 RWHP. after you get those things taken care of I think the max being put down right now is 640 RWHP on a stock block on a turbo lightning. there are a couple Kenne Bell stock blocks pushing 500+ RWHP. the key to these being realiable is getting a good safe tune and watching your a/f's.

built block... that's a whole new story, horse power there is limited to ho big your wallet is.