When Dynotech closed I purchased some cores and parts to help out the family.There were 3 BRF and 2 CZ valve bodies in bags that appeared to be already prepped for install.I dont know the history of them but they all appear to have the original springs in them,ie no shift kit or mods.I really dont have use for them as I have plenty of complete cores.Im looking for $ 50.00 each.The box has been sitting for over 2 years and I would like to get rid of them.