I would like to see some chrono numbers at those 28 pumps. I would wager a bet that after a certain number of pumps you are no longer building more pressure in the valve. I would bet it is escaping back past the pump.
Thanks All for the input - appreciated.Spooner - I'm trying to sort out what you wrote:The high volume/more pumping is not attractive to me so it looks like the RP valve is out. That was easy...The 760 check valve mod looks to be super inexpensive - what valve spring is used for that set up? What are the gains on that one - you went right into Mellon FTP numbers afterwards - kinda threw my thought process off.I do have a Mellon FTP set in route - I've got the parts listed above as well. Obviously I don't have to put them all into one unit but I was thinking one super hot rod would suit me and the other guns would be OEM spec stock shooters.I've got a rear cocker that needs a rebuild so this might lend itself to the 760 check valve mod to keep it mostly stock but give it a little oomph.There's a bolt gun that should ship any minute that is intended to be a parts donor/mod recipient too so I've got options.I have a lot of options and I'm trying to whittle it down and make a sort of standard build for myself.
What is used to stuff the valve for less volume?