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PROFORM 3/4" UHL x 3/8-16" (Set Of 16) Wedge Locking Header Bolts PR66752 Autofit

Wedge Locking Header Bolts PR66752

PR66752 - WEDGE LOCKING HEADER BOLTS 16
SKU PR66752
by PROFORM
$85.52 +GST - $85.52 +GST
$85.52 +GST
$85.52 +GST
$85.52 +GST - $85.52 +GST
$85.52 +GST
$98.348 Including GST (NZ Customers only)
Availability:
Low stock
Wedge Locking Header Bolts

3/4" UHL x 3/8-16" (Set Of 16)

PR66752

66752

Fits: GM BB 396-502 exc 348 & 409 Ford 5.0L, SB 289-302-351W, Mopar 413 Each PROFORM Grade 8 Header Bolt is permanently assembled with a pair of special washers. When the bolt is torqued to 28+ ft-lbs, the washers’ super-hardened external teeth bite into and grip the bottom of the bolt head and the top surface of the header. After being self-locked in this manner, any bolt-loosening rotation is blocked by a wedge-locking action created by the washers’ interfacing, matching cams. It’s an uphill climb: vibration that might ordinarily loosen the bolt actually increases the wedge-locking tension, securing the bolt even more. Because this simple wedge-locking method uses tension instead of friction, contact with oil actually facilitates the wedge effect. When changing headers, PROFORM Header Bolts can be untightened with a normal wrench, lubricated, and reused.