Does parts from a 1970 Pontiac 455 engine bolt onto 1976 Engine like heads and manifolds?

No, parts from a 1970 Pontiac 455 engine will not generally bolt directly onto a 1976 Pontiac 455 engine. While both are 455 cubic inch engines, Pontiac made significant changes to the engine design over those years. Key differences that would prevent direct interchangeability include:

* Cylinder heads: Head castings changed significantly, affecting bolt patterns, intake manifold bolt patterns, and even valve size and location.

* Intake manifolds: As mentioned above, the intake manifold bolt patterns changed, rendering 1970 manifolds incompatible with 1976 heads.

* Exhaust manifolds: Similar to intake manifolds, the exhaust manifold bolt patterns changed.

* Block modifications: While the basic block design remained similar, there could be minor differences that affect certain accessory mounting locations.

While some internal parts *might* be interchangeable (pistons, connecting rods, etc., depending on the specific internal specifications of each engine), external parts like heads and manifolds are almost certainly not. You'd need to verify specific part numbers for compatibility if you're considering swapping any components. Always double-check the part numbers against a parts catalog for a definitive answer.