Firing Order for a 305, pics please! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Trouper · 09-01-2003, 09:22 PM

This is about my 1985 Chevy Scottsdale.

I am ready to crank up my new 305 engine, but have a little trouble with the firing order. I know that the order is 1 8 4 3 6 5 7 2, but where on the HEI cap does the #1 wire go? I am confused, and NEED pics! Also, when the distributor is in, where should the rotor be facing?

PICS PLEASE!

lux hauler · 09-01-2003, 09:39 PM

This should get you going in the right direction.
http://www.corvetteforum.com/techtip...=107&TopicID=3

**swervin ervin** · 09-01-2003, 10:53 PM

Here you go.

Trouper · 09-02-2003, 10:16 AM

Thanks! That is what I needed.

*1FaastC10* · 09-02-2003, 06:51 PM

#1 should be right in front of the area that protrudes for the wires/connections on the cap. the illustration doesnt show that.

bpmcgee · 09-03-2003, 05:47 PM

If you've got an HEI distributor and look down on it, #1 should be the second plug clockwise from the big protrusion.

As a start, face that protrusion directly towards the drivers side bank of cylinders. This will put the #1 plug in about the right location.

Brian

jamis · 09-03-2003, 06:11 PM

It really dosn't matter where you put it as long as as the wire is in the same position as the rotor is pointing to, when #1 cyl is at top of it's compression stroke -12 degs.. The diagram that is at the top of the thread is the standerd for as long as ther have been v8 chevys. All lot of racers find it easier to point #1 straight ahead because its an easier postion to eyeball the distributer when your droping it in, rather the tring to point the rotor toward the #1 cyl.

*1FaastC10* · 09-03-2003, 08:13 PM

Quote:

Originally posted by bpmcgee
If you've got an HEI distributor and look down on it, #1 should be the second plug clockwise from the big protrusion.

As a start, face that protrusion directly towards the drivers side bank of cylinders. This will put the #1 plug in about the right location.

Brian

heh, i guess every distributor i've ever install and/or worked with has been one tooth off then. i've always had them on the first tower.

*mike reeh* · 09-03-2003, 11:01 PM

Me too. 1st tower after the batt/tach plug

mike

mjsmith1223 · 09-08-2003, 11:15 AM

Quote:

Originally posted by swervin ervin
Here you go.

I was looking at this and comparing it to how mine is set up. On mine #1 is where #6 is on this picture. The order is then normal. Is it possible that my distributor got put in 180 degrees opposite of this pic? Otherwise I don't see how the engine would even run.

Mike
Grand Haven, MI

*mike reeh* · 09-08-2003, 10:06 PM

you have to remember that if you put the #1 cylinder at top dead center of the compression stroke, its ready to fire. HOW you drop the distributor in, does not matter. The ONLY thing that has to happen, is whatever "tower" the rotor is pointing to, must be where the #1 spark plug wire is connected. Its totally arbitrary.

mike

Trouper · 09-08-2003, 10:12 PM

Okay, what's the easiest way to get it to top-dead-center by myself? I don't have a second set of hands right now to help. How can I figure it out while working on it alone?

Please remember.... I'm technically challenged...

mjsmith1223 · 09-08-2003, 10:39 PM

Quote:

Originally posted by mike reeh
you have to remember that if you put the #1 cylinder at top dead center of the compression stroke, its ready to fire. HOW you drop the distributor in, does not matter. The ONLY thing that has to happen, is whatever "tower" the rotor is pointing to, must be where the #1 spark plug wire is connected. Its totally arbitrary.

mike

That make's sense. It's running pretty good (other than being a bit rich) so I'll just leave the distributor alone. Thanks!

Mike
Grand Haven, Mi

09-01-2003, 09:39 PM	#2
lux hauler Psycho-billy Member Join Date: Jul 2001 Location: about 40 miles west of Cleveland, Ohio Posts: 2,591	This should get you going in the right direction. http://www.corvetteforum.com/techtip...=107&TopicID=3 __________________ '72 C-10 350 w/Lunati Voodoo cam (207/213, .437/.454), Performer intake, 625 Road Demon Jr. and Hooker headers. Support your community, support yourself. Buy local, buy American (or Canadian).

09-01-2003, 10:53 PM	#3
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Here you go. __________________ Mike 1985 Chevy C-10

09-02-2003, 10:16 AM	#4
Trouper Registered User Join Date: Jul 2003 Location: Round-a-bout Memphis, TN Posts: 27	Thanks! That is what I needed. __________________ 1985 Chevrolet Scottsdale SWB White w/blue interior 131,000 miles "Cop Car Engine" 305 TBI to gas swap from a 1993 9C1 w/Rochester 2bbl for gas mileage...

09-08-2003, 10:12 PM	#12
Trouper Registered User Join Date: Jul 2003 Location: Round-a-bout Memphis, TN Posts: 27	Okay, what's the easiest way to get it to top-dead-center by myself? I don't have a second set of hands right now to help. How can I figure it out while working on it alone? Please remember.... I'm technically challenged... __________________ 1985 Chevrolet Scottsdale SWB White w/blue interior 131,000 miles "Cop Car Engine" 305 TBI to gas swap from a 1993 9C1 w/Rochester 2bbl for gas mileage...

09-01-2003, 09:22 PM	#1
Trouper Registered User Join Date: Jul 2003 Location: Round-a-bout Memphis, TN Posts: 27	Firing Order for a 305, pics please! This is about my 1985 Chevy Scottsdale. I am ready to crank up my new 305 engine, but have a little trouble with the firing order. I know that the order is 1 8 4 3 6 5 7 2, but where on the HEI cap does the #1 wire go? I am confused, and NEED pics! Also, when the distributor is in, where should the rotor be facing? PICS PLEASE! __________________ 1985 Chevrolet Scottsdale SWB White w/blue interior 131,000 miles "Cop Car Engine" 305 TBI to gas swap from a 1993 9C1 w/Rochester 2bbl for gas mileage...

09-02-2003, 06:51 PM	#5
1FaastC10 Account Suspended Join Date: Oct 2002 Location: Elkhart, IN Posts: 6,400	#1 should be right in front of the area that protrudes for the wires/connections on the cap. the illustration doesnt show that.

09-03-2003, 05:47 PM	#6
bpmcgee Registered User Join Date: Mar 2003 Location: Northern Illinois Posts: 2,181	If you've got an HEI distributor and look down on it, #1 should be the second plug clockwise from the big protrusion. As a start, face that protrusion directly towards the drivers side bank of cylinders. This will put the #1 plug in about the right location. Brian

09-03-2003, 06:11 PM	#7
jamis F.A.S.T. president Join Date: Sep 2003 Location: Florida Posts: 1,883	It really dosn't matter where you put it as long as as the wire is in the same position as the rotor is pointing to, when #1 cyl is at top of it's compression stroke -12 degs.. The diagram that is at the top of the thread is the standerd for as long as ther have been v8 chevys. All lot of racers find it easier to point #1 straight ahead because its an easier postion to eyeball the distributer when your droping it in, rather the tring to point the rotor toward the #1 cyl.

09-03-2003, 11:01 PM	#9
mike reeh 5 day ban, learn to behave. Join Date: Nov 2002 Location: san diego, ca Posts: 684	Me too. 1st tower after the batt/tach plug mike

09-08-2003, 10:06 PM	#11
mike reeh 5 day ban, learn to behave. Join Date: Nov 2002 Location: san diego, ca Posts: 684	you have to remember that if you put the #1 cylinder at top dead center of the compression stroke, its ready to fire. HOW you drop the distributor in, does not matter. The ONLY thing that has to happen, is whatever "tower" the rotor is pointing to, must be where the #1 spark plug wire is connected. Its totally arbitrary. mike



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