APE Heavy Duty Cylinder Studs - Honda CB400F

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Heavy duty cylinder studs are necessary to prevent head gasket leakage in high compression engines. Stock studs are made from poor material that will stretch and allow gasket leakage. APE studs are made from heat treated chrome moly, centerless ground, and have rolled threads after heat treat for maximum strength. APE originated heavy duty studs for performance motorcycles and today is recognized as the industry's leading manufacturer. We supply studs to all of the top engin builders. No matter whose parts you have in your engine, join the top names in racing and insist on APE studs to hold it all together.

There are 3 different size studs.

Replaces Honda Part Numbers: 90031-377-010 (Stud A 8x155), 90032-377-010 (Bolt B 8x122), 90033-377-010 (Stud C 10x141)

APE part number: CS400H

Fits Honda:

CB400F Super Sport - 1975-1977


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  • 5

    Posted by David on 1st Jun 2018

    Look and feel more sturdy... Holding up fine

  • 5
    Fits CB350F... mostly

    Posted by Jamis McGrath on 30th Dec 2016

    No complaints about the product. Just a note to other buyers, all but the two medium size studs (ones with the fat ends) will also fit the CB350F.

  • 5
    Nice APE part

    Posted by Unknown on 26th Oct 2014

    Nice and solid Honda CB parts from APE