Most Chevy v8's are 18436572.
the firing order is 165432
Click the link.
165432 is the firing order for the 4.3 L engine
1.6.5.4.3.2
fireing order for 1997 astro van v6
165432 #1 cylinder is left front
Here is a link to Auto zone. Hope this helps you.
4.3 Engine 1-6-5-4-3-2
1, 6, 5, 4, 3, 2.
1, 6, 5, 4, 3, 2.
I think it is the same as the 1988 one that was previously answered. 1.6.5.4.3.2
The firing order for a 1987 4.3L Chevy Astro Van is 1-6-5-4-3-2. The cylinder numbering starts from the front of the engine, with cylinder 1 on the driver's side. Make sure to follow the correct firing order when setting the ignition timing or replacing spark plugs to ensure proper engine operation.