Spark Plugs?
Thread Starter
Intermediate
Joined: Dec 2005
Posts: 33
Likes: 1
From: Charlotte NC
Spark Plugs?
This question concerns my '67 Olds rather than my vette. However, this is a great site for helping with different projects and I thank you for that. My question is, I just went from a points to HEI distributor, and I am replacing plugs. Do I go with the same type of plugs and re gap then from .035 to .060, or should i go with another type plug. The engine is an Olds 425 4 barrel. Again, I apologize for posting a question regarding an Olds on this site but I am learning about different types of engines and this site is very helpful and useful.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
The HEI ignition may supply the plugs with higher voltage, etc. but the combustion chamber burn characteristics shouldn't be much different. If the plugs look good (not burning lean or rich and no significant deposits), heat range shouldn't need to be change. My question would be with the plug wires, not with the plugs.
