I was hoping to get a set of bosch plug wires and cap for my slant but the local canadian tire tried telling my mom that they would have to be special ordered because bosch didn't make them so i went to the bosch web site and found the part number for the wires but nothing for the cap and rotor and was wondering if the cap is the same for the 3.9L v6 or if there are some diffrences

(they are on sale this week in my canadian tire flyer)

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MOPAR OR NO CAR
1985 Ram
1975 Coronet
1998 Dakota

The cap and rotor are different. The rotor has a smaller hole, due to the 3.9 dist shaft being a smaller diameter, due to the 3.9 have no centrifical advance mechanism. The cap is also different. The relation ship of the locating notch to the tabs for the hold down clips is different.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

Can't imagine why you'd actively seek out Bosch's aftermarket ignition parts, which are junk. Any particular reason?

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

i have the bosch platinum +4 plugs i was thinking it might work better as a complete unit and the fact that they are all onsale this week for 25% off had a little something to do with it i'll probably get the wires and see what it will cost me for a msd ignition system

_________________
MOPAR OR NO CAR
1985 Ram
1975 Coronet
1998 Dakota

Can't figure out why you have those, either. Junk, junk, junk.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Ok, if the bosch platinum +4 plugs are junk, then what would you recommend?

msd any better?
thinking i might go with a msd ignition system depending on price

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MOPAR OR NO CAR
1985 Ram
1975 Coronet
1998 Dakota

MSD makes excellent ignition components. What's the goal, though? If you're not going racing, you can achieve an excellent ignition upgrade for a great deal less money than it takes to put in an MSD. See This thread.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

NGK and Autolite are my favorite and 2nd-favorite spark plug makers. For the '60-'74 heads (with spark plug tubes and gasket-seat spark plugs) my favorite plug is NGK ZFR5N and my 2nd favorite is Autolite 985. These are special extended-electrode plugs. See This thread which includes pictures of the extended vs. standard electrodes. The extended electrodes move the spark point out towards the center of the combustion chamber and away from the metal edges. The plugs were originally designed for tough-to-light engines (desmogged AMC 232/258, Chrysler TBI 318s in '81-'83 Imperials), 'cause the mixture is much less variable in the middle of the chamber than at the edges, and these long-electrode plugs give more consistent light-off of the cylinder under borderline-combustibility conditions. These plugs are also used in a lot of other late-model Mopars (4-litre Jeeps, 1st-generation 3.5 V6s, etc.)

I use 'em in my '89 Ram TBI 318, my 2.2/2.5 cars, my slant-6s...

Options are less for the '75-up taper-seat spark plugs. I'd probably run NGKs of one description or another in that kind of head, but don't think there are any extended-electrode plugs in that size format.

The Bosch "Plus 2" and "Plus 4" thing is a scam. More ground electrodes just get in the way of the fire!

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

ok were would i find a HEI ignition system would canadian tire carry it
and i will be running my bosch equipment untill i need to do a tune up on the engine i've spent the money for this stuff i'm not going to throw it in the garbage but just a question how does the niehoff rate i've never heard good things about them but they are some really affordable parts

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MOPAR OR NO CAR
1985 Ram
1975 Coronet
1998 Dakota

Go read the thread again. "HEI ignition system" is not something you go buy off the shelf. You use a standard Mopar electronic distributor, a GM HEI module from the parts store or wrecking yard, and some wire you supply yourself. It's all been written up and referenced many times here, and there's a link to the how-to in the thread I already sent you to.
Most of it's tolerably good.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

thanks dan

_________________
MOPAR OR NO CAR
1985 Ram
1975 Coronet
1998 Dakota

just one thought i got a 85 ram would they of changed the ignition setup i know i got this stupid box that was attached to my fender

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MOPAR OR NO CAR
1985 Ram
1975 Coronet
1998 Dakota

That ram prob still has that LEANBRUN mess on it.

Diff carb, dist, and ignition system.

Maybe, maybe not... my dad's '85 318 doesn't have leanburn on it. I do know there is a difference in the ignition control modules for the 80's as opposed to the earlier ones, but as far as I know you can interchange the later to the earlier and have it work (so long as you're running the single ballast resistor.)