Will a Chevy 454 big block fit in a 3rd generation camaro?

Answer:

Yes. The engine bay of the 3rd generation F-Body cars (Camaro & Firebird) are large enough to accommodate the Chevrolet Big-block engine with very little modification. We currently own such a car that was built (along w/ 19 others) by a dealer in upstate New York when new.

The engine fits very well, with all underhood metal staying intact. There is no need to cut the shock (strut) towers, or make any other structual modifications at all. This particular car uses stock GM motor mounts, and bolts directly to the original 5 speed transmission bellhousing. It will also bolt to most any GM rear wheel drive automatic transmission as well.

The fuel pump should be changed to a Holley unit if engine mounted (non-electric) to allow better line clearance - stock pumps will hit the steering linkage. Depending on how originally equipped, many of the brackets (A/C, alternator and power steering) can be re4-used, or are easily obtainable from performanve vendors.

Lastly, fo installation into cars originally computer/fuel injection equipped, care must be taken with wiring to ensure that all gauges, cruise control and auto transmission controls will still operate. Again, the aftermarket has many adaptors to 'fix' any electrical issues.