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Firing order diagram for a chevy 305. hei distibutor

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Firing order is 1-8-4-3-6-5-7-2 rotation is clockwise

Posted on Apr 26, 2010

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I'm working on a 78 chevy impala 305 engine and i need the correct firing order from the distributor to the spark plugs. Can anyone help?


go google and type in-- firing order for chev 305 v8 engine--- there will be pages showing the firing order, and direction of rotation

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Correct spark plug wiring diagram


Firing order for a 305 is 1-8-4-3-6-5-7-2. The distributor turns counter clockwise and #1 should be the 5 o'clock position looking down at the top of the distributor.

Jun 29, 2013 | 1986 Pontiac Firebird

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I have a 1985 Chevy 350 with an ac delco hei distributor and i have the plug wires crossed up somewhere. I need a diagram to show the correct plug wire placement please. Thanks


This should do it.
You can also do an internet search for a standard 350 Chevy engine.
The firing order is 1-8-4-3-6-5-7-2
The order is the same for engines from the mid 1990s back to the late 1970s.

images?q=tbn:and9gctgooegtkmpd2von7rsnyth6zhjrqslhu5zh4othxp_vwy1j9ss

Jan 16, 2013 | Cars & Trucks

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I need a firing order diagram for my 1984 buick lesabre. It has a 307 in it


Buick Engines except HEI: buick-except-hei-v8_firing-order.jpg Buick Engines for most except HEI:
Rotation: Clockwise
Firing Order: 1-8-4-3-6-5-7-2

Aug 22, 2010 | 1984 Buick LeSabre

3 Answers

Firing order on a 305 on the cap. Got the wires all messed up...


This method is good for the firing order on all chevy small block v8 engines from 265 cubic inches to 400 cubic inches. This would include 265, 283, 305, 327, 350, 400 cu. in. chevy small block v8 engines.

Let's cover some safety concerns first. If you try to troubleshoot a mixed up firing order with the engine running, you could be in for a serious shock,.. literally. You can do it, with certain precautions, but you really don't need to check the firing order with the engine running. You definitely don't want to try checking the firing order if you are wearing any kind of pacemaker or sensitive electromechanical prosthesis. The voltage coming out of the ignition coil is in the thousands. Common sense dictates that you wouldn't stick a knife in an electrical outlet, so you wouldn't want to take chances with being shocked by the electrical discharge from your classic chevy's ignition coil either. See the diagram:


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The firing order, which should be cast into the intake manifold, for the chevy small block V8 is 1-8-4-3-6-5-7-2. The firing order is the numerical sequence in which the spark plugs are fired. The insertion position of each spark plug wire around the circumference of the distributor cap can be found according to a clock face. The insertion sequence determines the firing order. The firing order is followed clockwise around the distributor cap starting from the 6:30 position with the 6:30 position being the number one cylinder spark plug wire.

On classic chevy small block engines that use ignition breaker points instead of electronic ignitions, the number one cylinder is the one immediately clockwise of the small metal sash cover on the distributor cap. The firing order starts here. There is no sash cover on the distributor cap for GM HEI electronic ignitions, and the firing order is the same, but starting at the 5:30 position.
The firing order makes sense if you know how the cylinders are numbered. The number one cylinder is the front most on the drivers side and 2 being the front most on the passenger side. From front to back, the cylinders are odd numbered on the drivers side, and even numbered on the passenger side.

Additional details HERE.

Hope helps (remmeber rated this).

Jul 12, 2010 | Cars & Trucks

2 Answers

I need the firing order and distributor diagram for a 305 engine on a 1994 chevy silverado.


The correct firing order is 18436572. If you need the correct cylinder locations they are as follows:
Drivers side from the front 1 3 5 7
Passenger side from the front 2 4 6 8

1994 Chevrolet C 1500 5.0 liter V-8 VIN "H"

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Hope this help (remember comment and rated this).

May 07, 2010 | 1994 Chevrolet C1500

1 Answer

I need a diagram of the firing order on an 81 chevy sport van with a 305 c-20


chevys firing order is 1-8-4-3-6-5-7-2- at front of engine number one cylinder is on drivers side

Jan 17, 2010 | 1983 Chevrolet Sportvan

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