BluePrint Engines B427KTKX SBC 427 with TKX, Carbureted, Pol.

This 427 combo pairs an 850 CFM Holley Double Pumper carburetor with a 5-speed TKX manual, giving BluePrint's higher-output small block classic carbureted induction and direct gear control; horsepower lands at 540, with 535 lb-ft of torque at 10.0:1 compression. It shares its forged crankshaft and pistons with the rest of BluePrint's 427 lineup.

What it is built for

The double-pumper carburetor and manual-choke setup favor a driver who wants classic carbureted response over electronic fuel injection, while still getting BluePrint's higher-displacement small block and a clutch pedal instead of an automatic. A polished front accessory drive and the same aluminum heads as the rest of the 427 family round out the long block.

What to check before ordering

McLeod supplies the Super Street Pro single-disc clutch for this kit, backed by its own hydraulic throwout bearing and bellhousing. A billet flywheel rounds it out, geared to make the most of this engine's low-end pull. A double-pumper carburetor of this size benefits from a properly sized fuel line and secondary throttle linkage set up correctly, so plan your induction routing accordingly. Treat this as an engine change under California rules, which means checking it against the Bureau of Automotive Repairs policy before the swap is finished.

Common questions

Does the carburetor need a manual choke cable? Yes, this 850 CFM Double Pumper uses a manual rather than electric choke.

Is the clutch a single-disc or twin-disc design? Single-disc, from McLeod's Super Street Pro line.

Is the accessory drive polished or black? Polished, as supplied with this combo.