Upper Allen Bolt Kit | Honda CB450 / CL450 / CB500T
The factory Phillips head screws on the Honda CB450 upper engine covers strip out — it's practically inevitable. Every time you pull a cover to get at the cam, the valves, or the points, you risk rounding another head. This stainless steel Allen bolt kit replaces the upper engine cover fasteners with socket head cap screws that won't strip and look clean doing it.
Why You Need This
Honda used Phillips head screws across the CB450 engine. They corrode, they strip, and they make routine work harder than it needs to be. Allen (socket head) bolts grip positively with an Allen wrench — no cam-out, no stripped heads, no frustration. Stainless steel resists corrosion and keeps your engine looking sharp.
This is the Upper kit — it covers the cam end covers, intake manifolds, valve covers, cam top roller cover, and points cover. The matching Lower Allen Bolt Kit is available as a checkbox add-on and covers the side covers (left and right), chain cover, oil pump cover, and electric starter — and it's the kit that includes the Allen wrenches.
Specifications
| Spec | Detail |
|---|
| Material | Stainless steel |
| Fits Models | CB450 K0–K7 (1965–1974), CB500T (1975–1976), CL450 K0–K6 (1967–1974) |
| Sold As | Complete upper kit (bolts only — Allen wrenches come with the Lower kit) |
What's in the Kit
- Cam end cover bolts
- Intake manifold bolts
- Valve cover bolts
- Cam top roller cover bolts
- Points cover bolts
Note: This Upper kit is the bolts only. The Allen wrenches come with the matching Lower Allen Bolt Kit.
Optional Add-On (Lower Kit) Includes:
- Side cover bolts — left & right
- Chain cover bolts
- Oil pump cover bolts
- Electric starter bolts
- Allen wrenches
Installation
Difficulty: Beginner
- Remove the old Phillips screws with an impact driver — this prevents stripping the heads on removal.
- Clean the threaded holes in the engine cases.
- Apply anti-seize compound to the threads of the new Allen bolts.
- Thread the bolts in by hand first, then tighten with an Allen wrench.
- Snug evenly and do not over-tighten — these thread into aluminum cases.
Tip: If you're pulling covers for service, grab a CB450 / CB500T Gasket Kit so you have fresh gaskets ready to go.
Frequently Asked Questions
Are the Allen wrenches included?
Not with this Upper kit — the wrenches come with the matching Lower Allen Bolt Kit. If you're buying the Upper kit on its own, you'll use your own hex keys.
Does this kit cover all the engine bolts on my CB450?
No — this is the Upper kit only. It covers the cam end covers, intake manifolds, valve covers, cam top roller cover, and points cover. The Lower Allen Bolt Kit covers the side covers, chain cover, oil pump cover, and electric starter. To convert every exterior fastener, get both.
Are these stainless steel?
Yes — every bolt in the kit is stainless steel, so it won't rust or seize like the plated factory screws.
Does this fit a CB350, CB360, or another Honda model?
No. This kit is sized specifically for the CB450 / CL450 / CB500T. We make separate kits for the CB175 / CL175, CB200 / CL200, CB350 family, and CB360 family.
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Last updated: June 2026
