What You're Looking At
This is a bare or reman cylinder head, depending on what you order, built for the DD15's EPA10/GHG14 emission architecture. That matters because Detroit changed head castings across engine generations to deal with EGR routing, injector bore configuration, and cooling passages. A head off a pre-2010 DD15 or a post-2014 GHG17 engine is not going to bolt up clean even though the block looks similar from ten feet away.
The 2010-2014 Cascadia window is where this casting shows up most, but plenty of these trucks got engine swaps or rebuilds over the years, so don't just go by model year on the truck door sticker. Pull the casting number off your old head or run the engine serial number to confirm before you order — a $3600 head is not the place to guess.
Injector bores, valve train, and EGR passages all have to match your harness and fuel system. If the injectors don't seat right or the EGR ports don't line up, you're pulling it back off.
How the Cross Numbers Line Up
A4730102620 shares a casting family with several other Detroit Diesel numbers — 4730101620, 4730102920, 4730103520, 4730105020, A4730101420, and the reman/OEM variants RA4730105020 and EA4730102620. These are revision and production-run changes Detroit made to the same basic head design, usually minor updates to coolant passages, machining tolerances, or supersessions when a part number gets replaced in the parts system.
The catch with cylinder heads is there's no room for 'close enough.' Injector bore diameter, valve seat angles, and the EGR cooler mounting have to be dead-on for your specific engine build. A reman number like RA4730105020 might be a direct replacement for your casting, or it might be a later revision that also fits — but you won't know until you match it against your old head's number or verify against the engine serial.
Rule of thumb: pull the number stamped or cast into your old head, or get the DD15 serial number off the engine block, and call us with both. We can run it against these cross numbers and tell you straight whether it's a match or not.
Ordering From PartStop
We're in Tacoma and keep heavy-duty engine components like this in stock for same-day pickup or will-call. If we don't have your exact casting on the shelf, we can usually get it in fast and ship nationwide — heads like this move a lot through freight, not parcel, so factor that into your timeline.
Every head we sell comes with the standard 6+ month warranty. Given the price point, we'd rather spend five minutes confirming your VIN and old part number upfront than deal with a return on a $3600 casting because the injector bores didn't match.
Call the counter with your VIN or the number off the old head. We'll cross it against what's listed here and tell you plainly whether it's a fit or not — no guessing games on a part this expensive.
A4730102620 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to A4730102620. Use them to identify the part — then confirm the exact fit by VIN or the number stamped on your old unit before you order. An interchange is a starting point, not a fitment guarantee.
| Brand / Line | Cross-Reference Numbers |
|---|---|
| Detroit Diesel | 4730101620, 4730102920, 4730103520, 4730105020, A4730101420, A4730101620, A4730103120, A4730103520, EA4730105020 |
| Detroit Diesel (OEM) | RA4730105020, EA4730102620 |
Frequently asked questions
Does A4730102620 fit my 2013 Cascadia with a DD15?
Likely, but confirm it. The 2010-2014 window is right, but engine swaps and running changes mean you need to match the casting number off your old head or the DD15 serial number before we ship anything this size.
Is A4730102620 the same as RA4730105020?
They're in the same casting family and RA4730105020 often crosses as a reman replacement, but it's a different part number for a reason — usually a production revision. Give us your old head's number and we'll confirm if it's a direct swap for your engine.
My old head number isn't on your list at all — now what?
Casting numbers get superseded over time and Detroit doesn't always keep the old number active in the system. Call us with whatever's stamped on the head or the engine serial number and we'll run it through the full cross-reference, not just what's shown here.
Not sure it fits? We check before you pay.
Run your VIN and we’ll match parts to your exact truck, or call the counter — a person who knows trucks verifies fitment by OEM number before the order ships. No wrong-box returns.
More cross-reference guides
Need the part, not just the reading?
Every part below is a Premium Quality aftermarket Direct Replacement with published OEM cross-reference numbers, a 6+ month warranty and same-business-day shipping from Tacoma, WA. Not sure it fits? Run your VIN — or call and a person who knows trucks will verify fitment before you pay.