Standing in front of the truck looking at the distributor, #1 would be at the 7 O'Clock position on the cap, from there clockwise it is 1, 2, 3, 4, 5, 6.
165432 is the firing order for the 4.3 L engine
The firing order on the 2.5L 4 cylinder engine is: 1 3 4 2
The firing order for a 1988 Chevy 350 engine is 1-8-4-3-6-5-7-2. This order ensures that the engine runs smoothly and efficiently. The distributor rotation is clockwise, and the cylinder numbering starts from the front of the engine on the driver's side.
18436572
if your asking if that is the firing order yes it is
Firing Order
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Most Chevy v-8's have the firing order of: 1 8 4 3 6 5 7 2
If you have a 305 or 350, it is 1,8,4,3,6,5,7,2.
1.6.5.4.3.2
Firing order is 1 2 3 4 5 6.
try www.haynes.com