I bought these retainers to use in conjunction with GM beehive valve springs (GM 12625033) from the Gen III LS9 engine on a couple sets of aftermarket aluminum heads i was building. Spec installed height for LS9 springs is 1.80". The information from Comp is these retainers will yield a 1.80'' installed height. Comp does not state on which head this installed height will occur nor if standard length valves are compatible so no one can say their specification is incorrect. I can tell you this; On a Chevy Vortec head for example these retainers install at 1.750'' losing 0.050'' of the LS9 springs lift capability. Stock Chevy Vortec springs normally coil bind at 0.520'' lift so with a 0.050'' safety margin you can run about 0.470'' lift. If you do the math a Comp 787 will allow a beehive spring which has a rated max lift of 0.570'' and coil bind lift of 0.615'' to go to 0.520'' and coil bind at 0.565'' on a 1.750'' install. Just be aware that comp 787 retainers with a standard 7* keeper don't install as high as Comp states and if you want to run more lift you'll need off-set valve locks or longer valves.Read full review
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Quality Product at a great price
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Retainers fit perfectly , on my ls 6 valve springs . Thanks .
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Great retainers, just what I needed.
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Haven't installed it yet!!!
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Their tech support is second to none. Great company
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Verified purchase: Yes | Condition: New
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