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Canadian Poncho Homepage -> Canadian Poncho -> General Beaumont Discussion -> Spark Plugs
Post Info TOPIC: Spark Plugs
Melanie


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Spark Plugs
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Hi, I have a 67 Beaumont with the original 327, with 202 double hump heads and a 4 barrel Rochester.

It's set up with a GM high ignition distributor.

I'm currently running period correct plugs and I was wondering if there is an updated spark plug for this set up? 

 

Thanks for your help!

Melanie



-- Edited by Melanie on Monday 31st of July 2017 08:42:10 PM

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4SPEED427


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If you have the original heads on there (which would actually be 1.94" double hump) I would regap the plugs to .045". Not ideal on a plug that's meant to be at .035" originally but with an HEI the wider gap is better. Going by memory I don't know of a .045" gap plug that is a direct fit for your head.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
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4SPEED427


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In case anyone is wondering, the reason it's not ideal to set a plug gap wider than recommended on a plug is because then the gap is not even across the electrode, it's angled. Likely makes zero difference on a stock engine but I'm sure racers wouldn't do it.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
zak404


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ACDelco makes a double platinum spark plug that you can get at NAPA 



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4SPEED427


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And that's the style with the washer on the thread, not the tapered seat style?

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
ak 67sd


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Are you having an issue with the factory plugs? I ran then on a similar engine, with a few different combinations of cam and intakes for many years without issues.

I do remember having to gap the plugs out of the box, and I ran the same with both points and hei... ran up past 7000rpm no problem and burnt nice. 


ak



-- Edited by ak 67sd on Wednesday 2nd of August 2017 08:55:41 PM

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Wpg, MB to London, ON

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4SPEED427


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Did you run them at .045" Andrew?

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
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zak404


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Yes sir they have the washer. I didn't notice it run any better,but I found they just last longer. I used to run them in my 340 duster and was impressed how they stood up to the leaded gas in the "ole" days.



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4SPEED427


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Interesting, I had never looked in the Delco book for platinums for our old cars. Sure enough, they are there. They still say to gap them at .035" which makes sense. I certainly would make them .045" with an HEI though.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
SGS Welding


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Can you post that part number? (Delco platinum plugs) I like to have the number figured out before I go to NAPA.

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67 Parisienne Convertible 

67 Parisienne 2 Door Hardtop 
zak404


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The part number was 41-833 ACdelco double platinum 



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4SPEED427


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SGS Welding wrote:

Can you post that part number?
(Delco platinum plugs)
I like to have the number figured out before I go to NAPA.




Sorry, I've been away but it looks like you got help!

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
Nov 18 to Dec 2 Black Friday UP TO 50% OFF Plus Huge Coupons
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SGS Welding


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Thanks Zak404 and Carl Ordered plugs this morning Have to come from out west will be here in a few days

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67 Parisienne Convertible 

67 Parisienne 2 Door Hardtop 
Magician40


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I run ac 44 stock plugs at 42 gap in my 300hp 327 with MDS HEI. They are clean and the engine runs great.
Brian

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zak404


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Thanks, maybe I will up the gap on my plugs, my engine is only 200 HP............for now



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4SPEED427


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On the majority of HEI equipped engines the gap was .045". Some were .060" and there was one year I think they did the gap on some engines at .080". .045" seems to work great.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
ak 67sd


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Hi Carl, I ran .035 and swapped back and forth from hei to dual points... the hei was a junk yard peice, the dual point was an accel. The points revved way faster past 7000, but I had to adjust it often to have it perform like that. Stock HEI, stock plugs were ok for many years, and that engine liked 4000-7000... maybe running it hard kept the plugs clean. I over-carbed the engine more often than not. 2-4s, six pack, 650 double pumper, etc.

AK

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Wpg, MB to London, ON

Numbers don't match! Especially HP and ET. 
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4SPEED427


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Is there a reason you left them at .035" with the HEI, or was it just simply that you knew you had to have them there with the points setup?


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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
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