A fwiw, for use with the OF 2.0 hydraulic roller cam Dave Bisschop has used the Comp Cams 26925 valve spring. It's a double spring that Comp Cams rates at 1.810" installed height with 141 lbs spring load.
Specs: 1.320 dia, 400 rate and either 1.070" or 1.100" coil bind, I've seen it reported with both numbers depending on the source.
The Comp Cams valve spring chart for the 26925 spring indicates 145 lbs at 1.800" installed height. These number are reasonably close to the popular Crane 99893 spring as Dave Bisschop used it with the original OF cam.
Dave stated it typically had 145-150 lbs at 1.800". And he noted it lost pressure after run in.
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 )
Old information here:
http://www.hotrod.com/articles/0712p...tiac-trans-am/
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5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension
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