They all have a TDC mark on the crankshaft pulley. Some also have marks to 50 degrees and some do not.
#1 cylinder when cranking is supposed to get spark when the pulley is at 5 degrees BTDC (before top dead center). That's when it's on the compression stroke. Easy to tell. Just loosen a spark plug and when it hisses because air is coming out - it's on the compression stroke.
If you have an engine with a crank pulley NOT fully marked, you can mark it yourself with a tape measure.
Points get set at .014" in your Lucas distributor. Static/initial timing is 5 degrees BTDC. Full advance is 39 degrees BTDC at 2200 RPM. Timing marks are on the crankshaft pulley. If your's only has the TDC mark and no 5 degrees BTDC? 5 BTDC is 9/32" before the TDC mark. 39 degrees BTDC will be 2 7/32" from the TDC mark.
When the engine is at 5 degrees BTDC, you can time without a timing light if you want. With power on, just loosen and rotate the distributor in the normal direction of travel - then back slowy until #1 wire sparks.
If you get working on your VN or VNN Zenith carb - keep in mind it is a British Zenith and has nothing to do with USA Zenith carbs.
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