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Note: Our sales team will be away from Thursday 30th July until Tuesday 4th August. Phone lines will be unattended and email replies may be delayed. Orders will continue to be processed and shipped as normal.
Note: Our sales team will be away from Thursday 30th July until Tuesday 4th August. Phone lines will be unattended and email replies may be delayed. Orders will continue to be processed and shipped as normal.
PROFORM Suit BB Chev 396-502, Ford 5.0L, SB Ford 289-302-351W, Mopar 413 Wedge-Locking Header Bolts - Black Oxide PR66756 Autofit

Wedge-Locking Header Bolts - Black Oxide PR66756

PR66756 - WEDGE LOCKING HEADER BOLTS 16
SKU PR66756
by PROFORM
Sold out
$87.23 +GST - $87.23 +GST
$87.23 +GST
$87.23 +GST
$87.23 +GST - $87.23 +GST
$87.23 +GST
$100.3145 Including GST (NZ Customers only)
Availability:
Out of stock
Wedge-Locking Header Bolts - Black Oxide

Suit BB Chev 396-502, Ford 5.0L, SB Ford 289-302-351W, Mopar 413

PR66756

66756

Each PROFORM 12.9 Steel (equiv. 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. Features: Grade 8 (12.9) Steel Hex Head Type 1-inch Length Fits GM BB 396-502 exc 348 and 409, Ford 5.0L, SB 289-302-351W, Mopar 413 Sold as One Set of 16 Pieces