* TDC isn't enough: Top Dead Center (TDC) on the compression stroke for cylinder #1 is only *part* of the timing process. The distributor also needs to be properly phased with the crankshaft's position relative to the camshaft. Getting TDC alone might place the distributor close, but it won't guarantee proper ignition timing. The engine likely won't run correctly, or at all, if you're even a few degrees off.
* Vortech specifics: The Vortech supercharger system adds complexity. The precise timing requirements for optimal performance are likely more critical than in a naturally aspirated engine. Improper timing could damage the supercharger or the engine.
* Multiple TDC positions: The crankshaft rotates 720 degrees for each complete four-stroke cycle. You'll hit TDC twice per revolution—once on the compression stroke (correct) and once on the exhaust stroke (incorrect). Getting the wrong TDC will result in a completely mistimed ignition system.
* Possible non-obvious marks: Although you might not see obvious markings on the distributor itself, there might be subtle marks on the engine block or harmonic balancer that, *if you know where to look*, can help with alignment.
What you should do:
1. Consult a repair manual: A factory service manual for your specific 1998 Vortech 305 is essential. It will provide detailed instructions and diagrams for correctly installing the distributor. This manual will show you how to find the proper TDC position and any other necessary alignment marks.
2. Use a timing light: After you've installed the distributor as closely as possible based on the manual, a timing light is crucial to properly set the ignition timing. You'll need to connect the light according to the instructions, and then adjust the distributor slightly until the timing mark on the harmonic balancer lines up with the correct timing mark on the timing tab.
3. Professional help: If you're uncomfortable with this procedure, it's best to seek professional help from a qualified mechanic. Improper distributor installation can lead to serious engine damage. The cost of fixing the engine is far greater than paying a mechanic to do this correctly.
Trying to guess the distributor position without proper guidance can lead to a frustrating experience and potential costly engine repairs. Invest in the right resources (repair manual) or professional help to ensure it's done correctly.
