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COMPATIBLE：
For Installation of Headers to Cylinder Heads
Fits 260, 289, 302, 351W, 351M, 400M (Windsor / Cleveland / M-Block Engines)
Fits Most Short & Long Tube Headers w/ Up to 5/16" Flange Thickness
We Recommend: Our Longer 1" Kit For Headers w/ 3/8"+ Flange Thickness
Will Not Fit: Exhaust Manifolds
SPECS：
Hardened 304 Stainless Steel
16 pcs 3/8" x 3/4" Allen Socket Head Bolts (semi-polished)
16 pcs 3/8" Washers (polished)
Accepts 5/16" Allen Key / Allen Socket for Install
Meets or Exceeds Industry Standard ASME / ANSI Specifications
Alternative Sizes / Styles Available!
KEY PERFORMANCE FACTORS：
Easy Gasket / Part Alignment
Quick Component Access for Tuning / Maintenance
Preserves the Threads of Your Precious Components
Will Not Rust like OEM or Black Oxide Fasteners
MG
Reviewed in the United States on March 15, 2025
I ordered these for my 1969 Chevelle headers. They fit very well but are just a hair short since the header bracket is just over a 1/4" thick so it does not leave much for the bolts to be tightened down without the possibility of stripping the threads out of the head. So I did not crank them down but rather just lightly tightened them down. They feel great in the bolt holes and the stainless steel Allen socket cap screw looks great on the motor. I will likely order the next size up which would be a 1" long header bolt. These will become another upgrade since these are really nice bolts. There is one thing that could be improved on and that is the size of the washers included. The inside hole dimension is a little large for a 3/8" bolt as it slides to the side and leaves a gap showing. I tried to show this in one of the photos but it does not look as bad as it really is. The washer could be just a hair smaller to properly fit these cap screw bolts. Other then that these are A plus quality bolts and I would not hesitate to reorder them or recommend them to others. Just check the length you may need as these are 3/4" thread length and in my application are just a little bit short.
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