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Old 04-23-2012, 11:19 PM
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Spark Plug Selection

Hi all,

I have a 355 sbc with 11:1 comp, running .035" quench, on 98 octane pump gas, with 294S comp cam / Sportsman II Heads / Victor Jnr / 750 mech secs (4.5 pv .074" jets front 80 back) w/headers and need to get ....SPARK PLUGS....

Anyone got a recommendation??

Can anyone please help..with type, heat range?

Many thanks,

Duke

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Old 04-24-2012, 02:56 AM
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When my 355 had the World Products S/R Torquer heads on it I used
Autolite 26 - Autolite Copper Core Spark Plugs
Recommended to me by the guy at MadElectrial, he used them in his race cars, never had any problems with them.
I now use the flat washer version with my Brodix heads.
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Old 04-24-2012, 03:56 AM
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Ha! Thanks Malc..... shoes on the other foot now! ...I'll check them out.
How'd ya go with your roadworthy?

Anyone else got suggestions?

Duke
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Old 04-24-2012, 06:18 AM
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sportsman II heads

If you look up info on your heads World Products recommend a spark plug: 14mm 5/8" .460" reach tapered style. Remember high performance engines use colder plugs than stock.
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Old 04-24-2012, 01:59 PM
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The autolite #26 is a hot plug same as stock AC delco R45TS.

Its way too hot for a 11:1 cr engine that will see full throttle.

Its for grandma's grocery getter.

Start with a champion RV8c or RV9yc (AC R42TS)
autolite 23 or AR23 or 144 gap at .035"
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Old 04-24-2012, 02:10 PM
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Your spark plugs will stay much cleaner and it will idle much better once you recurve the distributor for 26deg base timing at idle and 34-36deg at max advance. (10deg mech advance curve)

Or simply lock out the mechanical advance and run locked 34-36deg timing.
( auto transmission)

Use ported vacuum advance limited to 10deg at high cruise.

The 294S cam needs this generous amount of timing at idle.
A "normal" timing curve will foul any plug in a short time.

Competition race only spark plug for that head is autolite AR133
These are race only and are a bit too cold for street driving, but great at the track in a high compression motor.

Use the autolite AR23 plug (champion RV8C) on the street.

Last edited by F-BIRD'88; 04-24-2012 at 02:18 PM.
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Old 04-24-2012, 09:38 PM
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Thanks cdminter59 and F-BIRD88 for your replies, much appreciated.
I understand all of that and will set up accordingly.

Duke
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