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Old 12-19-2007, 11:50 AM
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all plugged up

Howdy guys:
How do I pick the "Right" plug for my 355 chevy motor. 11 1/2 to 1 compression, fulely heads mild port work, comp 280 magnum cam, pertronix ignition. I don't want to spend 24 bucks a plug for some exotic deal, just a good plug that will help me stay out of detonation on 92 octane.

Thanks for the help
The Tim Guy

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Old 12-19-2007, 12:30 PM
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Go get a plug from a 65 vette 327,this will be in the ballpark then adjust your heat range from there to dial it in.
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Old 12-19-2007, 04:13 PM
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11.5 compression, iron heads and 92 gas without detonation ? Good luck! You might be able to get away with it if you back off the timing and run cold plugs. I think your going to have to run better gas or run water injection or lower the compression. Most people will say 9.5 with iron heads and 92 gas.

You may want to try Singh grooves in the heads, some people swear by them but I have never tried them myself.

Jordon
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Old 12-19-2007, 04:22 PM
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I agree with XX. Too much compression without better gas or lower timing.
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Old 12-20-2007, 08:10 PM
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thanks for the information

Quote:
Originally Posted by barnym17
Go get a plug from a 65 vette 327,this will be in the ballpark then adjust your heat range from there to dial it in.
I got the plugs today from napa. How do I get a chart of a plug heat range??
How do I judge whether or not I need to go hotter or colder?

Thanks for the help.
Tim
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Old 12-20-2007, 08:33 PM
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Here's a spark plug chart, http://www.v6z24.com/mods/howto/imag...gs/plugs19.jpg
assuming your AF mixture is correct if your plugs are to hot you will have detonation problems and they may be blistered like in the picture.

If you plugs are to cold you may have dirty looking deposits on them. However this may also be because of a too rich fuel condition.

What brand plug did you get? You might try the manufactures website for info on heat ranges. Just curious is this a new engine?


Jordon
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Old 12-20-2007, 09:08 PM
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my engine only has 9.7 to 1 comp ratio, but i have found ngk v power plugs to work very well for me, cheap copper core, and they have a full heat range for just about all their plugs, also autolite plain jane spark plugs have worked very well for me in the past, less than 2 bucks apeice, so if you kill em, oh well.
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Old 12-21-2007, 09:06 PM
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new mojo

Thanx for the help. It's a brand new motor, maybe 40 mins run time, I've had huge issues with the distributor (pertronix - I've killed two modules) - anyway I'm up an running now and want to start looking at the plugs etc., I'll try to post after a bit with some tales of awesome burnouts or something, it's in a 52 International pickemup with a muncie 4 speed, Ford 9 inch etc.
Thanks again
The Timguy

QUOTE=xxllmm4]Here's a spark plug chart, http://www.v6z24.com/mods/howto/imag...gs/plugs19.jpg
assuming your AF mixture is correct if your plugs are to hot you will have detonation problems and they may be blistered like in the picture.

If you plugs are to cold you may have dirty looking deposits on them. However this may also be because of a too rich fuel condition.

What brand plug did you get? You might try the manufactures website for info on heat ranges. Just curious is this a new engine?


Jordon[/QUOTE]
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