I'm putting in a zz4 cam that has .474/.51 lift. will my stock L98 heads handle that much lift? and if not what all do I need to do to em so they can? or should I just buy new heads? thanks

 

i'd say .475 or so ,i always change springs and use aftermarket retainers instead of the stock rotators.

 

if I put on new springs and everything its still a nono to run that cam?

 

I just had my heads worked on and the machine shop said that my heads would only handle .460 lift before the retainers hit the valve seals. So they had to cut down the valve guides to provide more clearance. I have not seen anyone else have this problem, but I did. I have an 89 L98.

nick

 

I just had the same problem same cam w 1.6 roller rocker lift .510/.524 I had to have evertything machined down I was told the stock springs would break after about .420 lift consistantley

 

i just put in an lt4 hot cam (.492 lift) on my vette l98. i had the guides cut .050" and used new high lift springs that fit the stock spring seat.