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Old 02-05-2007, 07:53 PM   #1 (permalink)
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Would BBC still run with plugs in wrong order?

Bought this project K5 with a swapped in 454 and HEI. Only drove the truck to test and the PO drove it over to my house. Since then it's been a process of disassembly. Truck seemed to run fine.

Today, I'm swapping plugs and replacing header gaskets. Go to run the plugs wires back and they ain't right ]

To my knowledge, all Chevys (SBC and BBC) are (DS front to rear) 1,3,5,7 and (PS front to rear) 2,4,6,8. The HEI runs clockwise 1,8,4,3,6,5,7,2. I ran the wires in that order and the truck fired up and seemed to idle just like before (it's not mobile, so I couldn't drive).

The wires were NOT run in the correct order when I took 'em off. My question is, would the truck have run properly with the wires out of order?
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Old 02-05-2007, 07:55 PM   #2 (permalink)
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we had an EFI 429 that seemed to run OK with mis matchs plugs, but it ran better with them in order.
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Old 02-05-2007, 08:07 PM   #3 (permalink)
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Well if they were in the right order but wired off the distributor incorrectly wouldn't that almost be like retarding the ignition by 90 degrees? It would probably idle like that I bet.... So I suppose yes it could technically run in some configurations other than the right way.
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Old 02-05-2007, 08:42 PM   #4 (permalink)
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depends on how badly out of order, and if only a couple swapped, it might run but not be able to pull a load.
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Old 02-05-2007, 09:15 PM   #5 (permalink)
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depends on how badly out of order, and if only a couple swapped, it might run but not be able to pull a load.
x2 - maybe. It might idle poorly, but the timing would be so bad it wouldn't do much beyond that...
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Old 02-05-2007, 10:44 PM   #6 (permalink)
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Brother-in-laws new-to-him chevy pickup ran fine and idled ok, seemed to have a barely noticable vibration, kinda like the wrong balancer or something. He drove it around for two weeks with the 5 and 7 wires swapped...
The engine didn't survive.
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Old 02-06-2007, 01:14 AM   #7 (permalink)
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Weird. Wish I'd remembered to write down the order the wires were in. The dumbass had actually labeled the dist. cap in the wrong firing order, but I pulled off all the labels.

It seemed to idle and run fine.

I'll check the timing tomorrow.
d
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Old 02-06-2007, 03:32 AM   #8 (permalink)
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A buddy of mine wire a 350 backward and it ran. It popped and puked abit but it ran
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Old 02-06-2007, 07:25 AM   #9 (permalink)
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Originally Posted by Blatant View Post
Bought this project K5 with a swapped in 454 and HEI. Only drove the truck to test and the PO drove it over to my house. Since then it's been a process of disassembly. Truck seemed to run fine.

Today, I'm swapping plugs and replacing header gaskets. Go to run the plugs wires back and they ain't right ]

To my knowledge, all Chevys (SBC and BBC) are (DS front to rear) 1,3,5,7 and (PS front to rear) 2,4,6,8. The HEI runs clockwise 1,8,4,3,6,5,7,2. I ran the wires in that order and the truck fired up and seemed to idle just like before (it's not mobile, so I couldn't drive).

The wires were NOT run in the correct order when I took 'em off. My question is, would the truck have run properly with the wires out of order?

1,8,4,3,6,5,7,2 ?????

That is the firing order of a Big Block Buick.....

you shure you got a 454 and not a 455? Those came with HEI after 74...
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Old 02-06-2007, 08:38 AM   #10 (permalink)
 
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i had a 454 given to me with the plugs so out of order, i ended up swaping them all...funny thing is it ran...just like shit of course, but it would move around and what have you.

that was in a burb BTW
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Old 02-06-2007, 08:39 AM   #11 (permalink)
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Also make sure that the HEI is not installed 180 degrees off. They will idle with the HEI installed that way, but have no power.
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Old 02-06-2007, 08:40 AM   #12 (permalink)
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???

Don't know squat about Buicks, but nearly all modern Chevy motors to my knowledge fire 18436572.

Looks like a Chevy. Receipt from long block says 454. Stamped 7.4 on the DS block where it should be. Pretty sure it's a 454.
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Old 02-06-2007, 08:41 AM   #13 (permalink)
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Also make sure that the HEI is not installed 180 degrees off. They will idle with the HEI installed that way, but have no power.
Hmmm. Could be. Although last time I installed HEI on a different motor, I had it 180 off and it wouldn't fire. Motor would just puke through the carb.
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Old 02-06-2007, 08:41 AM   #14 (permalink)
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1,8,4,3,6,5,7,2 ?????

That is the firing order of a Big Block Buick.....

you shure you got a 454 and not a 455? Those came with HEI after 74...
Same for a Big Block Chev
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Old 02-06-2007, 08:55 AM   #15 (permalink)
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Same for a Big Block Chev
Small blocks as well
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Old 02-06-2007, 09:37 AM   #16 (permalink)
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Yes it will run like that, depending which ones are crossed on how bad it would run.

Your Firing order is correct.


Run 180 ?? NO!
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Old 02-06-2007, 01:48 PM   #17 (permalink)
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180 out on an hei ?? all the hei's i've messed with had a gear at the bottom not a blade. you could be off 1 tooth, or 5. dodge engines have the blade and are either out 180 or in. I think some fords did too.


Also, it is possible, but very unlikely, that the engine has a special cam in it with the 4/7 swapped in the firing order. This is starting to become a new way to gain a bit more power.

he also may have numered the cap because he had it in wrong, so he just moved the wires on the cap instead of reinstalling the distributor correctly.

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Old 02-06-2007, 02:58 PM   #18 (permalink)
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Appears to be a very mild 454 without much cam. The numbers he had marked on the cap did correspond to the cylinder that the wire was going.
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Old 02-06-2007, 08:09 PM   #19 (permalink)
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you can stab them wrong and wire them to run...I usually just go to tdc on compression stroke and start from there....tons of people make them run one way or another but not right....my old engine builder was one of those guys....
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Old 02-06-2007, 08:24 PM   #20 (permalink)
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had a mechanic put a set of headers on my 454, got it back, ran like crap-wtf? backfiring, etc. just a couple wires mixed up,fixed it, ran great
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