E303

I'm sure its 302HO 351w

You could always pull off a valve cover and use a dial indicator.

Does this help.....

Windsor (289, 302, 5.0, 5.0 HO, 351) Firing Orders

Have you ever needed to know what the cylinder firing order on your Windsor motor is? Fear not, as we have the cylinder numberings for pretty much all Windsor combinations out there!

289 1-5-4-2-6-3-7-8
302 (Pre-82) 1-5-4-2-6-3-7-8
302 HO (Non Roller cam) 1-3-7-2-6-5-4-8
5.0 1-5-4-2-6-3-7-8
5.0 HO 1-3-7-2-6-5-4-8
5.0 Truck 1-5-4-2-6-3-7-8
351 1-3-7-2-6-5-4-8

Cylinder Numbering

The table below covers the positions and numbering for all cylinders on a windsor motor. Generally, it can be summarised as follows: When looking into the engine bay the number one cylinder should be on your left hand side (left bank) at the front of the engine. The number eight cylinder is on the rear right (right bank) up against the firewall.

Firewall
4 8
3 7
2 6
1 5
Front bumper

Click to expand...

i know the difference very well as i've had all 3 engines.
Vamp bought a car, and the guy told him it had the E303, but it has the 1-5 firing order, so i think the guy gave him a load of bull. that's why i was asking.
thanks for the replies