I have been reading all of these posts on checking pushrod length. I am installing a set of crane cams 850-16 lifters and I already have a lt4 hot cam installed. Will I need to change the length of my pushrods, they are stock length.

 

Unless you have had the haeds milled you will be ok.

 

You didn't mention if you changed rockers.

Since it cost nothing to check, other than a little time, why not? Because you changed most of the valve train, it would be good insurance.