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Skip to contentHC Packard 40-56 underseat
There are two underseat dual stream heater cores in this period. This one has a single heater core, the other has two heater core
We have seen the Packard underseat Dual Stream heater core in the 1955 and 1956 most frequenlty but believe it may have been available as early as 1940. This core design is a better heat exchanger than the cellular film core but we can make the heater core larger for more heating if required.
Our build queue varies.
Made in the USA

We make to order. Please allow adequate time for us to build.
Build time estimates [late May 2025]
Model Ts Brass/Black [Our foundry has resumed production and we have begun shipping Model Ts. We will update the lead times asap]
Model As 9-11 weeks
Heater cores ~6 weeks
Model A and 32 Ford Street rods 8-9 weeks
Common street rods ~12-15 weeks
Tricky customs & complicated restorations ~20 weeks
We appreciate your patience as we continue to recruit and train new fabricators and manage the labor shortfall our country has been experiencing.
We make to order. Please allow adequate time for us to build.
Build time estimates [late Oct 21, 2025]
Model Ts Brass/Black
[Our foundry has resumed production and we expect to receive the next batch of castings ~Halloween. We will update the lead times asap]
Model As 8-12 weeks
Heater cores ~6 weeks
Model A and 32 Ford Street rods 5-6 weeks
Common street rods ~12-15 weeks
Tricky customs & complicated restorations ~20 weeks
We appreciate your patience as we continue to recruit and train new fabricators and manage the labor shortfall our country has been experiencing.