Proform 66755 PFM66755 WEDGE-LOCKING HEADER BOLTS LS, 1.181INL x 8mm, 12 PIECES Fits select: 1999-2019 CHEVROLET SILVERADO, 1997-2014 CHEVROLET TAHOE
Proform Parts

Proform 66755 PFM66755 WEDGE-LOCKING HEADER BOLTS LS, 1.181INL x 8mm, 12 PIECES Fits select: 1999-2019 CHEVROLET SILVERADO, 1997-2014 CHEVROLET TAHOE

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HEADER BOLTS
Additional Features
  • Color:Nickel Plated
  • Finish:Nickel Plated
Current price is $50.13
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Columbus, 43215
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Comparison Chart:
Vehicle model66755Proform 66755 PFM66755 WEDGE-LOCKING HEADER BOLTS LS, 1.181INL x 8mm, 12 PIECES Fits select: 1999-2019 CHEVROLET SILVERADO, 1997-2014 CHEVROLET TAHOE66751Proform 66751 PFM66751 WEDGE-LOCKIN HDR BLTS 3/4L X 3 Fits select: 1999-2021 CHEVROLET SILVERADO, 1988-2000 CHEVROLET GMT-400917-107Dorman 917-107 Exhaust Manifold to Cylinder Head Repair Clamp for Specific Models, Natural Fits select: 1999-2017 CHEVROLET SILVERADO, 2000-2015 CHEVROLET TAHOEP75-66757Proform 66757 Wedge-Locking Collector Bolts 3/8 Diameter 1.25 Long Black Oxide F8885Trans-Dapt Mini Head Header Bolts (12)44830AP 44830 Exhaust Tail Pipe Fits select: 1995-2000,2001-2002 TOYOTA TACOMAMALIBU, GMT-400PROFORM 66756 HEADER BOLTS 1"L X 3/8" Fits select: 1970 CHEVROLET MALIBU, 1988-2000 CHEVROLET GMT-40066752Proform 66752 PFM66752 WEDGE-LOCKIN HDR BLTS 3/4L X 3 Fits select: 1999-2021 CHEVROLET SILVERADO, 1988-2000 CHEVROLET GMT-400134-1201ARP 134-1201 Header Bolt Kit
Vehicle year1997Proform 66755 PFM66755 WEDGE-LOCKING HEADER BOLTS LS, 1.181INL x 8mm, 12 PIECES Fits select: 1999-2019 CHEVROLET SILVERADO, 1997-2014 CHEVROLET TAHOE1999Proform 66751 PFM66751 WEDGE-LOCKIN HDR BLTS 3/4L X 3 Fits select: 1999-2021 CHEVROLET SILVERADO, 1988-2000 CHEVROLET GMT-400-Dorman 917-107 Exhaust Manifold to Cylinder Head Repair Clamp for Specific Models, Natural Fits select: 1999-2017 CHEVROLET SILVERADO, 2000-2015 CHEVROLET TAHOE-Proform 66757 Wedge-Locking Collector Bolts 3/8 Diameter 1.25 Long Black Oxide F-Trans-Dapt Mini Head Header Bolts (12)1995AP 44830 Exhaust Tail Pipe Fits select: 1995-2000,2001-2002 TOYOTA TACOMA1970PROFORM 66756 HEADER BOLTS 1"L X 3/8" Fits select: 1970 CHEVROLET MALIBU, 1988-2000 CHEVROLET GMT-4001988Proform 66752 PFM66752 WEDGE-LOCKIN HDR BLTS 3/4L X 3 Fits select: 1999-2021 CHEVROLET SILVERADO, 1988-2000 CHEVROLET GMT-400-ARP 134-1201 Header Bolt Kit
Vehicle makeChevroletProform 66755 PFM66755 WEDGE-LOCKING HEADER BOLTS LS, 1.181INL x 8mm, 12 PIECES Fits select: 1999-2019 CHEVROLET SILVERADO, 1997-2014 CHEVROLET TAHOEChevroletProform 66751 PFM66751 WEDGE-LOCKIN HDR BLTS 3/4L X 3 Fits select: 1999-2021 CHEVROLET SILVERADO, 1988-2000 CHEVROLET GMT-400IsuzuDorman 917-107 Exhaust Manifold to Cylinder Head Repair Clamp for Specific Models, Natural Fits select: 1999-2017 CHEVROLET SILVERADO, 2000-2015 CHEVROLET TAHOEFord, ChevroletProform 66757 Wedge-Locking Collector Bolts 3/8 Diameter 1.25 Long Black Oxide FChevyTrans-Dapt Mini Head Header Bolts (12)AP Exhaust ProductsAP 44830 Exhaust Tail Pipe Fits select: 1995-2000,2001-2002 TOYOTA TACOMAChevroletPROFORM 66756 HEADER BOLTS 1"L X 3/8" Fits select: 1970 CHEVROLET MALIBU, 1988-2000 CHEVROLET GMT-400ChevroletProform 66752 PFM66752 WEDGE-LOCKIN HDR BLTS 3/4L X 3 Fits select: 1999-2021 CHEVROLET SILVERADO, 1988-2000 CHEVROLET GMT-400ChevroletARP 134-1201 Header Bolt Kit
Vehicle fitment typeUniversalProform 66755 PFM66755 WEDGE-LOCKING HEADER BOLTS LS, 1.181INL x 8mm, 12 PIECES Fits select: 1999-2019 CHEVROLET SILVERADO, 1997-2014 CHEVROLET TAHOEUniversalProform 66751 PFM66751 WEDGE-LOCKIN HDR BLTS 3/4L X 3 Fits select: 1999-2021 CHEVROLET SILVERADO, 1988-2000 CHEVROLET GMT-400SpecificDorman 917-107 Exhaust Manifold to Cylinder Head Repair Clamp for Specific Models, Natural Fits select: 1999-2017 CHEVROLET SILVERADO, 2000-2015 CHEVROLET TAHOESpecificProform 66757 Wedge-Locking Collector Bolts 3/8 Diameter 1.25 Long Black Oxide FSpecificTrans-Dapt Mini Head Header Bolts (12)UniversalAP 44830 Exhaust Tail Pipe Fits select: 1995-2000,2001-2002 TOYOTA TACOMASpecificPROFORM 66756 HEADER BOLTS 1"L X 3/8" Fits select: 1970 CHEVROLET MALIBU, 1988-2000 CHEVROLET GMT-400UniversalProform 66752 PFM66752 WEDGE-LOCKIN HDR BLTS 3/4L X 3 Fits select: 1999-2021 CHEVROLET SILVERADO, 1988-2000 CHEVROLET GMT-400SpecificARP 134-1201 Header Bolt Kit
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Showing 1-1 of 1 review

May 25, 2017
Jason in OH
5 out of 5 stars review

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.

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