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Proform Wedge-Locking Header Bolts LS Engines with 3/8" Header Flange in 8mm x 1.181" Long, Nickel Plated Finish

778-66755


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Wedge-Locking Header Bolts LS Engines with 3/8" Header Flange in 8mm x 1.181" Long, Nickel Plated Finish
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$31.95
4 left in stock
Wedge-Locking Header Bolts
  • LS Engines with 3/8" Header Flange
  • 8mm Diameter, 1.181" Long
  • Nickel Plated Finish
  • 12/pkg
  • Ships
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    66755 is rated 5.0 out of 5 by 1.
    Rated 5 out of 5 by from Great Locking Header Bolts These are TOO LONG to fit an LS3 with a 3/8" header flange, they will bottom out before the headers clamp to the head. That is ok I bought the shorter set Proform silver finish 66754 which is 0.9xx" underhead length which is perfect for LS3. There is still plenty of thread engagement with the cylinder heads, as the standard finish black Proform Wedge bolts listed for an LS3 are 1.000" underhead length. This set is 1.1xx" underhead length which is just a tad too long for LS3 application. They were torqued about 20ft/lb and have not loosened after close to 10 full heat cycles. Total cold ambient to full temp and back. Perfect.
    Date published: 2017-05-25
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