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Joined: Jun 2002
Posts: 315
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OP
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Joined: Jun 2002
Posts: 315 |
What are the best spark plugs for a moderatly built 292? I used Champions for years, but they're not highly regarded in some circles. I had bad results with the last batch -- since they stopped making them in Michigan, I guess.
I used Champion Truck Plugs # 4404 on my last motor, then tried Ch Plat 3031s and finally 4405s to go hotter.
I got a set of AC-R44XLS. But had to go to 4 auto parts stores to find them.
What corresponding AC-Delco numbers would equal those Champion heat ranges?
I/I #4101
'71 GMC Jimmy 350, sm465, np205,3.73 posi.
'68 C/10 Stepside 292 (.030 over) Offy Intake, 500 CFM AFB,Clif headers, sm465, 3.73 posi.
'67 K/10 454 project.
'72 K/5 rolling frame project.
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Joined: Aug 2003
Posts: 1,905
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I think platinums are over rated. Try NGK.They have a good rep, but you'll have to find crossover numbers.
Drew
Mid-Atlantic Chapter
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Joined: Jul 2000
Posts: 4,586 Likes: 20
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I have had Very good luck and performance with Both Champion and Autolites . But my motors Liked an Ran Better with the Autolites.
# 3220 }[oooooo]
Larry/Twisted6 [oooooo]  Adding CFM adds boost  God doesn't like ugly.
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Joined: Jun 2002
Posts: 315
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OP
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Well I went with AC R44XLS, and a new condenser, and put on an Edelbrock 500 CFM. And it's running like a bat outa hell now!
But I am noticing some run-on or dieseling, on shut down after a 15 mile hop in the 50s. Should I get plugs with a shorter reach, or is it just 2 months worth of cylinder wall scale burning off after such a long hangar session?
I/I #4101
'71 GMC Jimmy 350, sm465, np205,3.73 posi.
'68 C/10 Stepside 292 (.030 over) Offy Intake, 500 CFM AFB,Clif headers, sm465, 3.73 posi.
'67 K/10 454 project.
'72 K/5 rolling frame project.
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Joined: Jul 2000
Posts: 4,586 Likes: 20
1000 Post Club
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1000 Post Club
Joined: Jul 2000
Posts: 4,586 Likes: 20 |
Check the timing and you said something about changing the condenser.You may want to recheck the points as well.
# 3220 }[oooooo]
Larry/Twisted6 [oooooo] Adding CFM adds boost God doesn't like ugly.
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Joined: Mar 2004
Posts: 757
Major Contributor
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Major Contributor
Joined: Mar 2004
Posts: 757 |
Besides your timing check the idle speed and mixture screws again. Hot spots in the cylinders and even a slightly high idle speed will cause run on.
Mike G ( 4355 )
Mike G #4355
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