I want to purchase a valve spring compressor that bolts to the head so that you don't have to remove the heads to change out springs. Anyone have any recommendations?

 

http://www.irvingcustoms.com/nub-tools/

I think Jim's has a similar tool.

 

I didn't find one in the Jim's catalog. $275 for the irving customs compressor is ridiculously expensive. Can't I use one for a chevy out of summit racing catalog. They're $25 or so.