What are the timing marks for 1988 Chevy Nova?

There aren't single, universally applicable "timing marks" for a 1988 Chevy Nova. The specific timing mark location depends entirely on the engine installed in that particular Nova. Chevy Novas from that year could have several different engines (e.g., 2.0L, 2.5L, 2.8L, and various V6 and V8 options).

To find the timing marks, you need to:

1. Identify your engine: Look for an engine code stamped on a metal plate usually near the valve cover or on the firewall. This code will tell you the exact engine type.

2. Consult a repair manual: Once you know the engine, get a repair manual specific to that engine and year. The manual will have diagrams showing the timing marks (often on the harmonic balancer or crankshaft pulley) and the procedure for setting the timing. Haynes and Chilton manuals are readily available.

3. Look for the marks yourself: With the engine at top dead center (TDC) on the #1 cylinder, the timing marks should be visible. They're typically aligned with a mark on the timing cover or a pointer on the engine block. The repair manual will guide you to their exact location.

Without knowing the specific engine in your 1988 Chevy Nova, it's impossible to provide the correct timing mark information.