HiPo Registry
Frequently Asked Questions
Everything you need to know about the HiPo Registry.
What is a K-Code Mustang?
A K-Code Mustang is a 1965, 1966, or 1967 Ford Mustang equipped with the 289 High Performance engine. The "K" refers to the engine code in position 5 of the 11-character VIN. These engines produced 271 horsepower and used solid lifters, giving them a distinctive character compared to the standard 289.
How do I know if my Mustang is a K-Code?
Check position 5 (the 5th character) of your 11-character VIN stamped on the data plate or door tag. If it's "K", you have a K-Code. Example VIN: 6R09K512345 — the "K" in position 5 (after 09) confirms it's a 289 High Performance.
Is registration free?
Yes. Basic registration in the public registry is completely free. We believe the historical record of these vehicles should be accessible to all enthusiasts and researchers.
How is my privacy protected?
Your full VIN, name, email, and address are never shared publicly. The public listing shows a masked VIN (e.g., 6R09K1***56) that confirms K-Code status while hiding the middle sequence digits. Only you can see your full VIN in your private dashboard.
How long does approval take?
We review submissions typically within 3–5 business days. We verify that the VIN format is valid for a K-Code Mustang and that the submission appears genuine. You will receive an email notification when your vehicle is approved or if we need additional information.
What photos should I upload?
We recommend uploading: exterior shots (front, rear, both sides, 3/4 angles), interior (dashboard, seats, trunk), engine bay (overview and close-ups of casting numbers and date codes), and any documentation (VIN stamp, warranty plate, window sticker, build sheet, title). More documentation makes for a stronger record.
My vehicle has a replacement engine. Can I still register?
Yes. We accept vehicles with replacement engines. The registration form has an engine status field where you can select 'Replacement Engine' or 'Unknown'. Many K-Code Mustangs have had engine swaps over the decades — this does not disqualify the vehicle from being a genuine K-Code original.
What are 'numbers matching' and 'correct date code'?
Numbers matching means the engine block casting number and date codes correspond specifically to your vehicle's VIN and production date. Correct date code means the date codes fall within the plausible range for your vehicle's assembly date, but may not be the precise original engine. These are self-reported by the owner.
Still have questions? Contact us and we'll get back to you within 2–3 business days.