351C /w Aussies: Please help /w Spark plug T*, Chris Kelly or other 351C ppl. - Ford Muscle Forums : Ford Muscle Cars Tech Forum
 
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post #1 of 6 (permalink) Old 04-19-2003, 12:22 AM Thread Starter
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351C /w Aussies: Please help /w Spark plug T*, Chris Kelly or other 351C ppl.

Does anyone know what spark plug I should be using. It's a flat-topped, approx. 11.9 or 10.98 at min. C/R. all other specs are at http://www.ucalgary.ca/~bkormos/mustang.html
The plugs right now look VERY sooty.. It's a wet Soot, which would indicate very rich, or very oily. What plug should I use to avoid this, but also avoid detonation/pre-ign. ? the oil is probably from my pcv setup (you may be able to see it in the pics @ the above). I'm running it into the carb from one v/c and i have the other side blocked off (creating a strict vaccuum). Also, the reason it's sucking up oil right now is because I tore the stock baffles out of the stock 351C v/c's to create clearance for my Crane Energizers. Should I be running a vent on the other V/C?? I have new M/T covers (with baffles!) and plan on running a pcv on one side and a vent on the other.. is this the way to do it? I also got a compression tester and am going to test all around.. I'll post #'s tomorow.. help me out here please, fellas.


[ This Message was edited by: SteeLDawN on 4/19/03 12:26pm ]
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post #2 of 6 (permalink) Old 04-19-2003, 12:33 AM
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351C /w Aussies: Please help /w Spark plug T*, Chris Kelly or other 351C ppl.

I'd get stock plugs for a 1970 "M" code 351C ... those were 11.0:0 ... good starting point ...

If it doesn't seem right ... and you think compression is higher ... move to cooler plug.

Best advise I have
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post #3 of 6 (permalink) Old 04-19-2003, 09:27 AM
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351C /w Aussies: Please help /w Spark plug T*, Chris Kelly or other 351C ppl.

I run Autolite #25 -looks to be the right heat range.





1967 Falcon 4 door 351C - 70 Mustang 351C
Owner built, owner abused.
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post #4 of 6 (permalink) Old 04-19-2003, 01:37 PM Thread Starter
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351C /w Aussies: Please help /w Spark plug T*, Chris Kelly or other 351C ppl.

what about the pcv system? How should it be piped?
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post #5 of 6 (permalink) Old 04-19-2003, 08:58 PM
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351C /w Aussies: Please help /w Spark plug T*, Chris Kelly or other 351C ppl.

Some years ago I have a 351C in a street car. It was a boss 351C. AF22 plugs seemed to work well however, they fouled-up pretty quickly in city driving. AF32 seemed ok for city driving but were too hot for WOT.
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post #6 of 6 (permalink) Old 04-20-2003, 03:38 AM Thread Starter
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351C /w Aussies: Please help /w Spark plug T*, Chris Kelly or other 351C ppl.

Thanks That's a beaut. of a car you got there, Karl.
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