Where do spark plug wires run???
Thread Starter
Cruising
Joined: Sep 2017
Posts: 10
Likes: 0
Where do spark plug wires run???
Just bought a 74 with L-82 engine and the engine is not firing all cylinders. Going to replace all plugs, wires, and distributor just to be on the safe side. All of the wires are running on top of the engine, but a friend of mine (mechanic) says that they should be running under the engine. Which is the correct way to run the wires? I'm worried about rubbing and heat.
Pro
Joined: Sep 2017
Posts: 516
Likes: 72
From: Modesto California
Just bought a 74 with L-82 engine and the engine is not firing all cylinders. Going to replace all plugs, wires, and distributor just to be on the safe side. All of the wires are running on top of the engine, but a friend of mine (mechanic) says that they should be running under the engine. Which is the correct way to run the wires? I'm worried about rubbing and heat.
The wires are supposed to be routed down the rear of the block and then foreword; the front two on each side passing between the motor mount and the block. Someone will likely chime in with some pictures.
Le Mans Master
Joined: Aug 2006
Posts: 7,419
Likes: 1,555
From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
To each his own!
You can go over the top or from the bottom as was stock.
Having stock cast exhaust or headers plays into the decision.
Stock wires:
Having stock cast exhaust or headers plays into the decision.
Stock wires:
Thread Starter
Cruising
Joined: Sep 2017
Posts: 10
Likes: 0
Le Mans Master
Joined: Aug 2006
Posts: 7,419
Likes: 1,555
From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
Happy to help!
Have you looked under your Corvette to see if you still have the 'boomerangs' in place?
Have you looked under your Corvette to see if you still have the 'boomerangs' in place?
Le Mans Master
Joined: Aug 2006
Posts: 7,419
Likes: 1,555
From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
Then just go over the top.
There are many styles of wire holders so Google Chevy ignition wires and see what type you might like.
There are many styles of wire holders so Google Chevy ignition wires and see what type you might like.
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Team Owner
Joined: Sep 2006
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From: Westminster Maryland
Hi GV,
It's important to have the heat shielding as Pb's photos show.
The four heat shields above the pairs of spark plugs help protect the plugs from the intense heat generated by the exhaust manifolds.
The 2 boomerang shields help protect the pairs of wires that are running forward behind the exhaust manifolds to the forward pair of spark plugs on each side.
Running the foreword pairs through the motor mounts as 71VL suggests is impotent too in order to keep those plug wires away from the exhaust manifold heat.
Regards,
Alan
It's important to have the heat shielding as Pb's photos show.
The four heat shields above the pairs of spark plugs help protect the plugs from the intense heat generated by the exhaust manifolds.
The 2 boomerang shields help protect the pairs of wires that are running forward behind the exhaust manifolds to the forward pair of spark plugs on each side.
Running the foreword pairs through the motor mounts as 71VL suggests is impotent too in order to keep those plug wires away from the exhaust manifold heat.
Regards,
Alan