Will a 555 big block fit in 1976 Chevy stepside?

A 555 cubic inch big-block Chevy engine is significantly larger than the standard big blocks that were offered in 1976 Chevy trucks. Fitting it into a 1976 Chevy Stepside will require significant modifications, and it's unlikely to be a straightforward bolt-in job.

You'll likely need to address these issues:

* Engine bay clearance: The 555's larger dimensions will almost certainly require modifications to the firewall, inner fenders, and possibly even the frame to accommodate it.

* Exhaust system: A custom exhaust system will be necessary.

* Transmission: You'll need a transmission capable of handling the torque of a 555. This might necessitate modifications to the transmission tunnel.

* Cooling system: A larger radiator and potentially an upgraded cooling system will be needed to handle the increased heat generated by the larger engine.

* Steering: The additional weight and size might require modifications to the steering system.

In short, while it's *theoretically* possible, it's a major undertaking requiring considerable fabrication and mechanical expertise. It's not a simple swap. You'd be better off starting with a detailed plan and consulting with experienced engine swap specialists.