MSD-6A question
Melting Slicks
Joined: Aug 2012
Posts: 2,548
Likes: 379
From: Woodinville WA
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
I went down that road too. I used a Mallory CD box with a rev limiter. Went back to the factory TI. Easier starts and better idle with the TI than I ever got with the Mallory. IT's still on the car, and a pretty simple changover in case the 40+ year old TI gives up. It'll get me home.
Safety Car
Joined: Oct 2004
Posts: 3,920
Likes: 731
From: Youngstown Ohio
The ignition itself doesn't cure idle issues, but recurving the distributor to allow more initial timing while maintaining optimum total timing (approx. 35°-38°) will help tame the idle of a high overlap cam.
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Melting Slicks
Joined: Dec 2009
Posts: 3,195
Likes: 632
From: Thunder Bay
My cam is not huge. Its a hydraulic roller with about 230 deg at .050 but it idles a little rough. Not sure why such a mild cam has a rough idle, but the Comp Cams catalog even says it idles rough. The MSD 6 definitely smoothed out the idle. Didn't provide much other advantage though.