Quote:
Originally Posted by David Ray
ANY spark plug gap over .045 is begging for both coil and module failure. GM tried that with both .060, and .080 gaps for the HEI's, for leaner mixtures to meet increasing emissions jetting, and had to warranttee so many modules and coils, it wasn't funny. Dropping the plug gaps back down to .045 MAXIMUM STOPPED the coil and module failures.
Spark plug heat ranges are not set by ignition systems, but by actual compression ratios. So, just numbers thrown out, lets say an AC44 is for a 10.00:1 c/r, and that is what your engine has, run the 44 heat range. Adjust heat range as needed.
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Great to see you post on here Dave! I sent you a PM on an unrelated matter.
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Will Rivera
'69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears
‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears
'64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears (Traded)
'69 LeMans Vert, 350, #47 heads: Non-running project
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