X 2 Ron sets his idle check valve at 3 lb's
Also the nozzles as mentioned in the above post is absolutely correct, you can buy Enderle nozzles for $85.00 a set, it would cost you more than that to change the dropin jets and they are rated by the size in thousands just as rons are. Ex. Rons .039 equals Enderle .039 nozzzle, Hilborn uses a pressure measured system for sizing the nozzles and cost more than twice the cost of Enderle nozzles.
JMO
Zip.