Vavle stem height....

danmc77 said

How about the varience in the installed spring height? If the exhaust valves are sitting lower (the stem), the spring pressures will be off from intake to exhaust, right? My plan was just to install shims under the intake springs to raise them up and match the spring height of the exhausts. Does that sound right? Right now, there are no shims installed under the springs. In addition, I'll use the adjustment in the rockers to compensate for difference in valve stem height. Will that work?

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It's a good idea to check the spring height and shim it accordingly. Stock spring height is 1.68-1.7" If the intakes are already at that height their ok. The exhaust may actually be less than that since the seats weren't sunk as far when replaced so shimming the intake valves to match the exhaust may just create another problem. You have to watch the installed height and make sure it don't coil bind at full lift. For instance if the installed height comes out to be 1.65 and you have a .500 lift cam you subtract the cam lift from the installed height and it comes out to 1.15 Now if the spring coil binds at 1.15 your in trouble. You need some tolerance there. Usually .050 will give you enough room so in this case a spring that don't bind until 1.1 lift would work. Using the adjustable rockers to adjust the preload should be fine unless they are way off.