I have a MSD 6AL unit in my 71 with a big block. I opened up the gap to .050. The only issue I came across is if you don't use a pliers type plug gapper you can't get the ground electrode square to the center electrode. The larger gap gives you the benefit of a larger spark kernel and a more efficient burn. The fat spark generated by the MSD ignition could jump a hundred thousandths gap without a blink. However, I'm talking about a full MSD, or equivalent, ignition system...box, coil, distributor and wires, not a box used with stock parts.
Here is a link with some useful information: http://www.centuryperformance.com/spark.asp#How%20a%20Spark%20Plug%20Works: Bill Vander Werf ----- Original Message ----- From: [EMAIL PROTECTED] To: [email protected] Sent: Sunday, January 20, 2008 1:44 AM Subject: [Chevelle-list] MSD question O/T Hi wondering if it is true, i was told to open my spark plug gap to .050 (fifty thousandths) when using a MSD unit thanks Harlan
