11mm Head Studs for Subaru EJ & FA Series EnginesDesigned for all Subaru EJ20, EJ22, EJ25, FA20 and FA24 engines, HCR 11mm Head Studs significantly enhance engine performance and reliability compared to standard cylinder head bolts. These studs are highly recommended for engines pushing up to 550hp. Our improved thread design has been rigorously tested to provide the best solution for clamping cylinder heads onto the block assembly, reducing the risk of head lift under high boost conditions. Set
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