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Retainer and Lock Kit to suit SB Ford w/ .393/.393" Tip Length Valves w/ 1.800" Installed Height, RLK-748

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Product Description

Special Retainer & Lock kit for SBF  with .393"/.393" tip length valves

Retainer & Lock Kit for SB Ford, 1.800" Installed Height

FITMENT: SB Ford engines with .393”/.393” tip length valves.

Kit comes with 16 Chrome Moly Retainers and Machined Locks for SB Ford engines running .393" tip length valves on both intake and exhaust.

This listing is for SB Ford heads which have .393" tip lengths on both, intake and exhaust valves and desire an installed height of 1.800".

Note- If your application has factory size staggered tip length valves, (.393"/.481") you'll want to look at part number: RLK-749

This kit will produce right around 1.800” installed heights. Final installed height availability is subject to factory production tolerances which can create minor variations in final installed heights from one casting to the next.

Retainers in this kit will work with single and select dual springs.


 Will this kit fit your springs?


 Use this check list to verify fitment:

1.       If the outer valve spring inside diameter is between 1.060”-1.080” (measure inside spring, not damper) *For other spring sizes, see Note 1 towards the bottom of this page

2.       If the target installed height requirement is around 1.800” or less

4.       If using dual springs, the inner spring inside diameter will also need to be measured. It must be .695” or larger.


Retainer size details are listed below. The step(s) on the retainer needs to fit inside the spring.


      Retainer Step sizes:

  • First Step Diameter: 1.060"
  • Second Step Diameter: .690"
  • Retainers and Locks are 7 Degree


Heads which have had a valve job will generally produce slightly taller installed heights equal to the amount of material removed from the valves and seats during machining.

Note 1: Custom Machining- If your springs require retainers with a smaller step diameter (if your springs have a smaller ID than 1.060") we can custom machine the retainers for a fee. If interested, feel free to inquire via the contact us link on our website.

Limited availability item.


Alex’s Parts, the smart choice in valve train products.

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