BluePrint Engines B454KTKX SBC 454/563HP w/ TKX, Carbureted, Pol.

A 950 CFM Holley Double Pumper feeds this 454, BluePrint's biggest-displacement build in the lineup, through a 5-speed TKX manual rather than an automatic. Output holds at 10.5:1 compression, the same 563-horsepower, 545 lb-ft rating as the EFI version.

What it is built for

The large double-pumper carburetor favors a driver who wants maximum carburetor flow for this displacement rather than electronic fuel injection, paired with manual-transmission control instead of an automatic. The single-plane intake and polished accessory drive match the rest of BluePrint's 454 builds.

What to check before ordering

The clutch hardware here is sized for big-block torque rather than carried over from a small-block kit: McLeod's Super Street Pro single-disc clutch takes care of engagement. A hydraulic throwout bearing, bellhousing, and billet flywheel finish the package, with gearing sized for a big block rather than carried over from a small-block kit. A 950 CFM carburetor needs a fuel system and secondary linkage sized to match, so plan your induction and fuel delivery accordingly. Confirm Bureau of Automotive Repairs engine-change compliance before finishing a California installation of this part, since it is not a direct factory replacement.

Common questions

What carburetor comes with this combo? A 950 CFM Holley Double Pumper.

Does the carburetor use a manual choke? Yes, this Double Pumper is manual-choke rather than automatic.

Why such a large carburetor? A 950 CFM unit is sized to feed this big block's airflow needs at 563 horsepower.