^^ I go with Schex...and the EV-27 is noisy... no preload is going to Change that... Adjustable is For Out of Normal Cam Specs...and there are still One Piece pushrods available, in custom Lengths... I use a set of adjustables to get the appropriate length...
Oh...and if you run Solid Lifters.... ya Need adjustable pushrods... Think Ironhead Sportster, and converted Shovelheads... Gots 'Em

 

ok thanks , I was told that a bit more preload makes the ev27 a little quieter? If not then the stock pushrods will be the easiest for me. I'm just running Johnson hylift hydraulic tappets.
cheers

 

.125 should calm down a EV-27 or Woods cam, ran a Wood W6H for roughly 8 years, setting the lifter depth to .140 does quiet them down but depends on oil pressure, lifter condition and valve spring pressure. It's my understanding the clack comes from the steep ramp of the cam lobe shock hit and recovery of the lifter not really designed for a street engine. The .140 has already lost roughly .020 from thermal expansion making it .120, a .100 setting will be roughly at .080 now, seems the tighter compressed oil area of a lifter takes the shock better than longer travel possibly due more like a solid lifter not collapsing and recovers easier from the cam step lobe shock. Trying to use a 3rd grade education the best as possible and ran the most aggressive street cam design being quiet as a church mouse, the 640 in the current engine is quiet setting lifters deep.

 

Running an EV27 right now...with O.E. Pushrods... I would do it that way again... In fact next is an EV13...again I will use O.E. Pushrods