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Vehicle Info NeededMR GASKETPART NUMBER: 720-3409
Ultra Seal Header Bolts 3/8" -16 x 3/4"
$4332
Ships on Nov 03, 2026
Lowest Price Guarantee
Hex Head
- Ultra Seal Header Bolts
- 3/8''-16 x 3/4''
- Extra-Small 3/8" Head
- Includes AN Style Washers
- 12/pkg
- Quick and Easy Installation
- Heat-Treated For Strength
- Ideal For Tight Spaces
- Grade 5 Material
- Protective Black Finish
- Header Flange Bolts - Hex Head
Mr. Gasket's grade-5 bolts with 7/16'' hex head are designed to handle the abuse of ultra-hot exhaust ports. Features a smaller than standard 7/16'' hex head which is perfect for tight-clearance headers. Part #720-3409 bolts feature a smaller, 3/8'' hex head and come with AN-style washers. In many cases you can even use a box end wrench to tighten your headers! Black oxide plated.
Header Flange Bolts - Socket Head
Save time work and solve the impossible tightening problems of some header installations with socket head bolts. Grade-8 and black oxide plated.
Part TypeHeader Bolt
Product LineMr. Gasket Ultra Seal Header Bolts
BrandMR GASKET
Package Height1.3
Package Width4.1
Package Length6.2
Weight0.55 PG
Part CategoryPerformance Parts
Thread Size (In.)3/8-16
Underhead Length (Mm)19
Underhead Length0.75 in (19.1 mm)
QuantitySold as a set of 12
Fastener StyleBolt
Fastener FinishBlack oxide
MaterialSteel
Part FitmentUniversal
Fastener MaterialSteel
Head StyleHex
Vendor Part Number3409
Package Qty1
Package TypeEA
ITEM YOU MAY ALSO CONSIDER
JEGS
3/8"-16 Header Bolt Kit, Hex Head, 3/4" Long for AMC, Chevy and Ford
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TRANS DAPT
Small Head Grade 5 Header Bolts Fits Small Block Chevy, Big Block Chrysler, Pontiac
Part Number : 969-8885
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JEGS
Part Number : 555-30711
$969$10.59
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TRANS DAPT
Part Number : 969-8885
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Some parts are not legal for use in California or other states with similar laws / regulations
