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spark plug problem

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Old Dec 1, 2004 | 09:58 AM
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grndprixss's Avatar
grndprixss
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Joined: Oct 2004
Posts: 56
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From: nyc
Car: 85 pontiac grand prix
Engine: 355 tpi
Transmission: 700r4
spark plug problem
it seems that every few months i need to replace my spark plugs because one cracks i have no idea what the cause of it could be can anyone help, i use ac delco plugs r43ts ive even used the heavy duty plugs this time, i have a msd 6al cd box, accell 8.8 wires and a msd blaster ss coil 44,000 volts .5 amps. can anyone help
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Old Dec 1, 2004 | 10:46 AM
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jackballs529's Avatar
jackballs529
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Joined: Jun 2004
Posts: 313
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From: Buffalo, NY
Car: 1987 Iroc-z
Engine: 355/Edelbrkhds/lpe219cam/MiniRam/
Transmission: 700R4/3.27 9bolt
Don't know, the only thing I can think to ask is are you running the correct plug gap?
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Old Dec 1, 2004 | 10:48 AM
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grndprixss's Avatar
grndprixss
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Joined: Oct 2004
Posts: 56
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From: nyc
Car: 85 pontiac grand prix
Engine: 355 tpi
Transmission: 700r4
im running a 50 gap. can spark nock cause that?
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Old Dec 1, 2004 | 03:28 PM
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VetNutJim's Avatar
VetNutJim
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Joined: May 2003
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From: Columbus,Ga.
Car: Different One Every Day
Engine: LS1,LS6,L98,L83
Transmission: 700R4, 4060E,Turbo 350, Turbo 400
What part cracks?

External Insulator?
Internal Insulator?
Ground Strap?
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Old Dec 1, 2004 | 04:37 PM
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jackballs529
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Joined: Jun 2004
Posts: 313
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From: Buffalo, NY
Car: 1987 Iroc-z
Engine: 355/Edelbrkhds/lpe219cam/MiniRam/
Transmission: 700R4/3.27 9bolt
Are you running after market ignition? If not, Spark gap should be .035
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