i just checked thunders page and they didnt list the 875s for LS1 cars. they used to have the comp R lifters in the LT1 section but stated that they were on backorder so if you did see them in the LS1 section then its possible they were just overlooked. it is my understanding that GM put the same lifters in all LT1 and LS1s so that is why you would see them listed in both sections.

if anyone is afraid of replacing stock lifters with stock lifters for whatever reason then you can always just go solid roller that way, any minute difference between the comp Rs and stock replacements will no longer be relevant.

 

I stand corrected on thunders page, i misread, but the other sites still have it listed that way.