I remove ALL the stock stuff, its usually tired/worn , heavy and weak.
If you want to know what I did with my heads...I threw 5.011 length 1.94/1.60 valves into them and cut for and use 1.437 diameter springs.
The height is raised .100 from 1.625 to 1.725, but in my case...a .065 hard washer under the rockers coupled with the gaskets 519SDiirr I used and .025 milled....gave the needed preload and stock push rods are retained. There are quite a few springs that seat at 1.70-1.75 installed @115-135lbs pressure and yeild 250-310 open. I have boxes of Springs and valves and things like that that are new and slightly used so I'm into making common things work, making his head except anything an La head could use ...basically. This is hot rodding...so I don't feel i need to stick with too many stock constaints. Like crap springs. With stock cam... I use comp 986 springs with 1.94/1.60,comp retainers,locks,shims to nail them to 130-135 seat about 255 open @.416 lift ..still room for up to .500..I also port them. I don't believe in putting heads on that dont flow well, Waste of effort.imo
