Correct, the last set of 995's that were brought here checked 160lbs on the seat at 360lbs over the nose, a bit much for the RAIV camshaft. They also came with retainers and 10 degree locks. Any spring used must be checked with the retainers you are going to use, as the inner step not only effects spring pressure, it also effects coil bind of the inner spring.
The dampner used with the 995's should be smoothed out where it contacts the head/shims, as they can/will cut into the shims and put metal in the assembly. They are well made springs, but not a "drop-in" for the Pontiac heads. We prefer and use the 68404's and 405's listed above, excellent direct replacment springs for high lift cams.
We've used the 68405's with HR to lifts as high as .624", no problems. They can also be shimmed to 1.650 for flat solid cams.......Cliff
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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