Error in 64-67 AIMs; RH wires from spark plugs to distributor cap towers

[Gary B.]

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Gary

[John P.]

Re: Error in 64-67 AIMs; RH wires from spark plugs to distributor cap towers

Hello Gary, View "A" in the second illustration has the number 4 and 8 plug wires connected backwards on the cap. Also the number 2 and 6 are connected backwards at the cap. In the first illustration the wires are connected properly. I had to look at this several times to believe they would have crossed these wires in the illustration.

[Duke W.]

Re: Error in 64-67 AIMs; RH wires from spark plugs to distributor cap towers

View B is correct showing #1 just to the right (pass. side) of the cap window and the rest clockwise in the firing order, but with the timing set to spec the the cap clips should not be perpendicular to engine centerline. Rather, the plane of the cap window should be near perpendicular to engine centerline,

I also agree that 4 and 8 and 2 and 6 are connected backwards on the cap.

Duke

[Wayne G.]

Re: Error in 64-67 AIMs; RH wires from spark plugs to distributor cap towers

Gary,
The wires in the illustration are in the wrong position on the distributor cap? Number 1 cylinder position in the cap is going to number 4 plug position.

Wayne

[Gary B.]

[John P.]

Re: Error in 64-67 AIMs; RH wires from spark plugs to distributor cap towers

Gary, the first illustration is correct for your application.

[Gary B.]

[John P.]

Re: Error in 64-67 AIMs; RH wires from spark plugs to distributor cap towers

Gary, the number 2 and 4 wires were always closest to the block and number 4 the closest to keep it as far away from number 8 to prevent crossfire. It mounts on the inside hole on the support rubber insulator. The passenger cars had a shield that mounted to the block to keep the wires close to the block. The corvettes had small clips attached to the oil pan to keep the wires close to the block. The number 8 wire coming off the plug is almost in direct alignment with the outboard hole in the support rubber insulator.

[Duke W.]

Re: Error in 64-67 AIMs; RH wires from spark plugs to distributor cap towers

The 1963 Corvette Shop Manual page 6Y-28 Fig. 52 labels the wires in the parallel vertical runs as viewed from the back, which would be the view of someone sitting in the driver's seat

7315...4628

Viewed from the front, such as peering into the engine compartment the order is:

8264...5137

Duke

[Gary B.]

Re: Error in 64-67 AIMs; RH wires from spark plugs to distributor cap towers

[Gary B.]

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[Jack M.]

Re: Error in 64-67 AIMs; RH wires from spark plugs to distributor cap towers

Kindly humor me, by reviewing the crazy theory that follows:

I've highlighted the wires for 1963, and 1964 (similar thru 1967)... colors for each cylinder, are the EXACT SAME.
Following the wires to the cap, did 1964-67 somehow REVERSE the rotation of rotor to counter clockwise?
The only way that 1-8-4-3-6-5-7-2 would work, was if the rotor was spinning CCW (as seen BELOW).
(I realize the location of #1 on the cap is NOT right... cap numbers CHANGED to follow the colors of the firing order.)

1963-64 Corvette AIM (Plug Wire Routing COMPARED).jpg

I've also ATTACHED a larger PDF file to easily review... it wasn't easy to hand color everything. LOL
Nothing makes total sense, but perhaps the draftsman was familiar with CCW rotation distributors...
But if that was the case, why not change the distributor cap image (like I've presented)?
And why didn't anyone ever notice, all during the remainder of the C2 builds?

See what you think, and kindly share your thoughts.

[Gary B.]

[Duke W.]

Re: Error in 64-67 AIMs; RH wires from spark plugs to distributor cap towers

I'm not aware of any reverse rotation distributor small block ever produced by GM.

I recall that GM did offer OTC gear drive racing cams for big blocks that required a reverse rotation distributor.

Duke

[Jack M.]

Re: Error in 64-67 AIMs; RH wires from spark plugs to distributor cap towers

I specifically did NOT mention any Corporation/Division when I theorized the draftsperson was "familiar with CCW distributors". Weren't some Olds, Pontiac, Ford, and Mopar distributors CCW (as Mr Google indicates)... or perhaps 'somebody' just believed the rotation was wrong, and requested the update. There had to be a revision reason... and the CCW rotation (which the drawing reflects), is a viable guess.