Checked out Magnecore and actually looked thru their catalog numbers to see if the one directed to a Ford Y- block was used else where indicating a possible "universal" fit. The # for the 7 mm was 8700 and was not shown to fit any other engine with the exception of a 368 Merc. This then appears to be for our engines. Reading many answered question also indicates their reasoning for all of their products. They stated to OEM replacements, I'm assuming later model engines, that their pricing is comparable, I will agree to the extent I have priced a single spark plug wire in the $18-20 range for an 80-90's engine at a dealership.
You do get what you pay for as they say and the list price for kit #8700 is $157.87 and i didn't find them listed at any typical parts store or internet supplier.  Like I said earlier I am looking to replace mine in the original holder/routing and will probably remove the exhaust manifolds to do it correctly. The "view" pages listed above will definitely help.

56 Vic, B'Ville 200 MPH Club Member, So Cal.

Good point Ted. I know there are other brands out there that work excellent also. What I should have stated is: "This is how this brand worked for me, your results may vary." Stay safe everyone because south eastern Michigan is getting hit very hard.


64F100 57FAIRLANE500

Almost any spark plug wire out there is susceptible to induction firing.  This is where the wires run parallel to each other for any length of time.  For cylinders that fire close to each other in the firing order, that extra generated spark creates a misfire.  For cylinders that don’t fire close to each other, it’s just an extra spark being generated when not being needed.

Lorena, Texas (South of Waco)

After researching spark plug wires I found Magnecore to be the best. After almost 10 years they are still as flexible as when new and I'm running an MSD 6A box fired by a Ford Duraspark trigger and Blaster coil with NO PROBLEMS ever.  Everything properly threaded through the blocks and separators and they fit perfectly. I could have bought much cheaper but...................


64F100 57FAIRLANE500

i thought with modern leads there was no problem ,but i have the only car on the planet that has decided to do  this.(it does not like me sometimes!)

It all depends on wire quality, amount of current produced and trying to fire a lean mixture. There are quality 7MM wire sets out there that will prevent cross-fire.

____________________________

i thought with modern leads there was no problem ,but i have the only car on the planet that has decided to do  this.(it does not like me sometimes!)

fantastic! thats what i was trying to find THANK YOU SO MUCH

Big window, it might be because of the blocks and there hole sizes. I know 6-7mm wires are probably way better today but guys seem to think that they need top fuel mag 44 amp wires when changing.
My wires have been in 8 years and I think about changing. I’m anal enough to remove the exhaust manifolds to do it and get it right. I also think it’s because most of us went to electronic ignitions.
About 10 year ago I was involved with a custom HD build and we used a Swedish wire we got from Husqvarna for chain saws and put it thru the frame and never had a failure. It was a little over 1/8” in diameter.
A lot of us over think everything.

56 Vic, B'Ville 200 MPH Club Member, So Cal.

Is this a issue anymore with the improvements made in plug wires?

Durham Missouri

I agree with John, I always separate #1 and #2 also.