Tuning help
Thread Starter
1st Gear
Joined: Sep 2021
Posts: 1
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Tuning help
Recently I acquired a '74 C3 convertible. Numbers matching 350cid. Was running rough and thought I'd do a turn up on it. Decided to replace points with a Mallory electrnoc ignition upgrade and new plugs and wires. Still runs a bit rough, and was curious if I need to replace/upgrade the coil as well. And also, should I use different size wires other than the 6mm OEM type.
Last edited by Stuck nutz; Sep 23, 2021 at 11:40 AM.
Instructor
Joined: Jun 2003
Posts: 110
Likes: 41
You need to look at everything. Compression check, plugs, coil (HEI has the coil attached). Everything here is easy to check out, just takes time. I presume you have a repair manual. I would do that compression check!
Le Mans Master
Joined: Aug 2017
Posts: 8,336
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From: Cool Northern Michigan
H-m-m-m-m-: New plugwires.
I assume you triple checked the firing order. But almost as important is to keep #5 and #7 plug wires as far apart from each other as possible. Especially with thin 6.5 cables. Those two have a tendency to crossfire because of the firing order. Its called Inductive Crossfire.
I assume you triple checked the firing order. But almost as important is to keep #5 and #7 plug wires as far apart from each other as possible. Especially with thin 6.5 cables. Those two have a tendency to crossfire because of the firing order. Its called Inductive Crossfire.
