Hey Everyone!

Alright...so the prep work has started on my W2 Econo Race head build. These will go on the 408 stroker short-block that's getting done in parallel.

I love to do as much of the stuff as my skills allow, and at this point in time in the project that primarily means measuring things and figuring out where the "out of spec" stuff may be.

Here are the parts in question:
1) HEADS - W2 Econo Race - long valve with cast-in pedestals
2) VALVES:
INTAKE - 11702 Manley, 5.240" OAL, 0.290" tip length, 11/32 stem
EXHAUST - 11703 Manley, 5.255 OAL, 0.290" tip length, 11/32 stem
3) SPRINGS - 930 CompCams, dual with damper, 1.900" installed height, 153lbs@1.900, 383 lbs@1.250"
4) RETAINERS - 741 CompCams, 10 deg.
5) LOCKS - 611 CompCams, 10 deg.

The MP recommended installed height on this head is 1.950-2.020", but that is with the original MP valves, which are 5.280" long. Since my Manley valves are only 5.240-255 long I decided to get the 930 springs since they are a 1.900" installed height.

So here are the measurement results:

HEAD_1:
1 INTAKE 1.909
1 EXHAUST 1.868
3 INTAKE 1.915
3 EXHAUST 1.872
5 INTAKE 1.920
5 EXHAUST 1.858
7 INTAKE 1.922
7 EXHAUST 1.857

HEAD_2:
2 INTAKE 1.925
2 EXHAUST 1.870
4 INTAKE 1.917
4 EXHAUST 1.864
6 INTAKE 1.924
6 EXHAUST 1.866
8 INTAKE 1.924
8 EXHAUST 1.861

So while the INTAKES seem to be alright, maybe could actually use a shim, the EXHAUSTS on the other hand are a tad too short.

My question: is the extra spring compression of 0.040" that much of a problem?

I am using the CompCams hydraulic roller lifters and the tech-line guy said I am good for 110-150 lbs @seat position. Per their spring chart the 930s are going to be putting about 171 lbs with another 0.050" compression on them...so my ultimate worry is: am I putting too much pressure on the lifter?

Therefore, since the heads are going to the machine shop next to do the 3/8 to 11/32 switch, should I make the required cut on the exhaust spring seats as well?

Ah, one more thing: the W2 heads have a slightly raised inner spring seat, I believe this should be machined to flush or nearly flush with the outside spring seat, is that correct?

The inner seat on the head is about 0.120-0.125" raised right now, and with the spring retainer's inner seat already being 0.100" lower than the outer seat that means I lose 0.225" already from total spring travel.

The 930 spring has a bind height of 1.160", that means I have a total available travel of 1.900-1.160=0.740, seems comfortable until you drop another 0.225" due to the inner spring seats. Now, the inner spring bind height is 0.900" (measured by compressing the spring in a bench vice with soft jaws), so from that perspective when I add the 0.225" to that number I end up having the same bind height for the outer and inner coils. Is that a bad thing?