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These retainers will normally produce around 1.720" installed height in SBC heads w/ Std length valves.
Heads which have had a valve job will have slightly more based on how much is removed when cutting the valves and seats.
Unlike stock GM retainers, these are manufactured from 4140 Chrome Moly Steel so they are plenty strong.
They also offer improved clearance between retainer and seal which is always a good added feature.
Specs:
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