Spark plug suggestion? - Team Camaro Tech
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post #1 of 19 (permalink) Old Apr 11th, 19, 07:56 AM Thread Starter
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Spark plug suggestion?

I'm looking for spark plug suggestions. I have a 350 with '68 double humps that have been slightly ported and I believe it has 10.1 compression. I also have a Comp Cams 280/494 in it with 1 5/8 headers along and a Holley Sniper FI system. I'm guessing in the 350 - 370 hp range?

Doing some research I see that the ACDelco R45S or Autolite 3924. I'm leaning towards the ACDelco but wanted to get suggestions. Also, what gap would you recommend with either?
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post #2 of 19 (permalink) Old Apr 11th, 19, 08:25 AM
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Re: Spark plug suggestion?

Yes

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post #3 of 19 (permalink) Old Apr 11th, 19, 02:18 PM
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Re: Spark plug suggestion?

Seeing how R44's which aren't made anymore I would run Champion J8C instead of the AC's.

Just an FYI: AC spark plugs aren't made by AC anymore
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post #4 of 19 (permalink) Old Apr 11th, 19, 03:16 PM
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Re: Spark plug suggestion?

NKG ! select your heat range
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post #5 of 19 (permalink) Old Apr 11th, 19, 03:34 PM Thread Starter
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Re: Spark plug suggestion?

Quote:
Originally Posted by flat tire View Post
NKG ! select your heat range
Any suggestions?
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post #6 of 19 (permalink) Old Apr 11th, 19, 03:46 PM Thread Starter
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Re: Spark plug suggestion?

Quote:
Originally Posted by bob15 View Post
Seeing how R44's which aren't made anymore I would run Champion J8C instead of the AC's.

Just an FYI: AC spark plugs aren't made by AC anymore
Looks like the J8C is also Champion 841. Do those definitely fit? A couple sites I came across said they don't.
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post #7 of 19 (permalink) Old Apr 11th, 19, 04:02 PM Thread Starter
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Re: Spark plug suggestion?

Quote:
Originally Posted by flat tire View Post
NKG ! select your heat range
Thoughts on the NGK 3522?

Summit said it fit Chevy 350 but other places says it doesn't.

https://www.summitracing.com/parts/ngk-3522
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post #8 of 19 (permalink) Old Apr 11th, 19, 04:40 PM
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Re: Spark plug suggestion?

Small block AC plugs in the 60's were typically 43 & 44's which is then turned into R43 & R44 with a resistor

R45S: RJ12YC ~ Hot
R44: J8C/RJ8C ~ Med ~ came with 327/350hp
R43: J6C/RJ6C ~ Cold ~ came with 302

With my 327 and how it is built and the carb is adjusted, I run a cold plug (RJ6C) with zero issues. Personally, I would run a middle-of-the road heat range and go from there.
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post #9 of 19 (permalink) Old Apr 11th, 19, 04:42 PM
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Re: Spark plug suggestion?

R45ts

67 RS/SS 350 4sp.
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post #10 of 19 (permalink) Old Apr 11th, 19, 05:31 PM
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Re: Spark plug suggestion?

45ís for the street

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post #11 of 19 (permalink) Old Apr 11th, 19, 06:02 PM Thread Starter
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Re: Spark plug suggestion?

Anyone have a gap suggestion?
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post #12 of 19 (permalink) Old Apr 11th, 19, 08:34 PM Thread Starter
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Re: Spark plug suggestion?

NGK 7938 were suggested to me. Anyone used them before?
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post #13 of 19 (permalink) Old Apr 12th, 19, 03:41 AM
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Re: Spark plug suggestion?

Quote:
Originally Posted by dcaver View Post
Any suggestions?

NGK plugs are colder the higher the number, hotter the lower the number. Starting with part # BKR6E-11 (Heat Range 6), a colder plug would # BKR7E-11 (Heat Range 7), a hotter plug would be # BKR5E-11 (Heat Range 5). For NGK Racing Plugs, the Heat Range is located AFTER the hyphen.
I run R5671A-7 stock #4091 in my stroker. my compression is 10-9-1 and I tried a #8 and it was to cold
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post #14 of 19 (permalink) Old Apr 12th, 19, 02:15 PM
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Re: Spark plug suggestion?

Quote:
Originally Posted by dcaver View Post
Anyone have a gap suggestion?
Stock .035
With Ignition box .035 - .040
The higher the gap the harder your ignition system will run.

Mark 70 Z28 M22 3.73 Z21 Z87 - Lunati 20120121 Roller Cam

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post #15 of 19 (permalink) Old Apr 12th, 19, 02:21 PM
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Re: Spark plug suggestion?

The NGK 3332 (XR5) equivalent to the AC Delco R43/R44 plug for the 70 Z28.
I've used this and it works well. I'm currently testing AC R43S since I live in the country and rarely drive city driving stop and go speed limits. I'm always 50+ mph.

Mark 70 Z28 M22 3.73 Z21 Z87 - Lunati 20120121 Roller Cam

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