Spark plug wires for 496 HO…Is there a real aftermarket option/solution?

[UnWoke]

Looking at the cost of an OE set makes me wonder.
I ran a search and found little discussion on the topic.

 

[Shlbyntro]

the merc wires are the factory wires that came from gm on the 8.1s. Volvos have a 45degree boot instead of the factory 90

 

[UnWoke]

the merc wires are the factory wires that came from gm on the 8.1s. Volvos have a 45degree boot instead of the factory 90

Are most buying the factory wires from GM or are they buying the merc set?

 

[Shlbyntro]

The Merc set is literally repackaged GM wires for the 496s/8.1s with a 50% markup.

Buy them where you can find them either which way

 

[UnWoke]

The Merc set is literally repackaged GM wires for the 496s/8.1s with a 50% markup.

Buy them where you can find them either which way

Gotcha…ordering a set for a 2007 Silverado now.
Thank you!

 

[UnWoke]

The Merc set is literally repackaged GM wires for the 496s/8.1s with a 50% markup.

Buy them where you can find them either which way

Posting these just in case someone else is looking….Thanks again.

CHEVROLET SILVERADO 2500 HD MSD Ignition 39849 MSD 8.5mm Super Conductor Spark Plug Wire Sets | Summit Racing

Free Shipping - MSD 8.5mm Super Conductor Spark Plug Wire Sets with qualifying orders of $109. Shop Spark Plug Wire Sets at Summit Racing.

www.summitracing.com

 

[Shlbyntro]

Posting these just in case someone else is looking….Thanks again.

CHEVROLET SILVERADO 2500 HD MSD Ignition 39849 MSD 8.5mm Super Conductor Spark Plug Wire Sets | Summit Racing

Free Shipping - MSD 8.5mm Super Conductor Spark Plug Wire Sets with qualifying orders of $109. Shop Spark Plug Wire Sets at Summit Racing.

www.summitracing.com

I don't think those will work. the factory wires have 2 sizes. short for the outer spark plugs and long for the inner spark plugs

here, these will work

 

[UnWoke]

I don't think those will work. the factory wires have 2 sizes. short for the outer spark plugs and long for the inner spark plugs

I just noticed that myself…they are all only 13” long.
I think the set on the boat are 24” and some even longer

 

[UnWoke]

I don't think those will work. the factory wires have 2 sizes. short for the outer spark plugs and long for the inner spark plugs

here, these will work
View attachment 1239137

WTF is the difference between those and these? That’s just crazy.

8.1L Spark Plug Wire Set

8.1L Spark Plug Wire Set

marinepartssource.com

 

[Shlbyntro]

WTF is the difference between those and these? That’s just crazy.

8.1L Spark Plug Wire Set

8.1L Spark Plug Wire Set

marinepartssource.com

The brand. Merc is crazy expensive as well, something like $80/wire. The ones I posted are standard run of the mill wires. Sierra makes a great performance after market set for fair money. I'll see if I can get you the PN and post below

 

[UnWoke]

The brand. Merc is crazy expensive as well, something like $80/wire. The ones I posted are standard run of the mill wires. Sierra makes a great performance after market set for fair money. I'll see if I can get you the PN and post below View attachment 1239139

Awesome…thanks for all the help!

 

[Fun Times]

Looking at the cost of an OE set makes me wonder.
I ran a search and found little discussion on the topic.

Chevy GM Vortec 8100 8.1L Performance Spark Plug Wires - Mercruiser 496cid Spark Plug Wires - Raylar Engineering

Vortec 8100 8.1L chevy gm spark plug wires. 496 MAG / 496 MAG HO spark plug wire sets.

www.raylarengineering.com

 

[Runs2rch]

Awesome…thanks for all the help!

All of the wires posted are meh at best. Here is a much higher quality set for less.

MerCruiser 496 Marine Set | Spark Plug Wires

sparkplugwires.com

 

[DiamondDave]

Call John he has custom made Moroso ones specifically made for the Merc 496. WAAY better than Merc ones.

Boats Unlimited | Marine Technician Service | Inspections

Boats Unlimited offers a full service & repair department. We also offer a professional marine fuel injector cleaning service.

www.boatunlimited.com

 

[Mcob25rg]

What Diamond Dave said

 

[Runs2rch]

Call John he has custom made Moroso ones specifically made for the Merc 496. WAAY better than Merc ones.

Boats Unlimited | Marine Technician Service | Inspections

Boats Unlimited offers a full service & repair department. We also offer a professional marine fuel injector cleaning service.

www.boatunlimited.com

He doesn't have them in stock. Talked to him a few days ago. He is waiting for a shipment. The Scott wires are the same quality. Just received two sets today. Very high quality.

 

[Lavey 29]

Thanks guys for putting my name on this and I was told about the post. Yes this would be John. The wires I have is MY DESIGN and tested. Moroso makes them to my specs. Moroso extrudes the inner core in house plus builds them in house for me exclusively. You will not find them anywhere else. There is alot more to ohms and looks of spark plug wires. For one the boots especially for the coil boots, the 496 ign. coil boots need to be a high premium grade silicone inwhich is expensive. Then we have the fitment of the boots to the coil tower and the spark plugs plus preventing the back feed of any spark. Big difference here vs all other 496 wires. I hate to even post some info because all I am doing is helping out others for their manu of 496 wires. These companies never even seen a marine 496 more of less even scanned one plus know zero about these PCM 555 's controllers .

Next info, Scotts does not manufacturer any of the wires, they buy spools of wire and put them together. MSD is China wires and alot of those cheap wires are not USA made nor offer enough interference suppression if any at all. Not what you want for these marine engines.

Next we have the electrically interference RFI and EMI inwhich the 496 pcm 555 and the two knock sensors can not stand ( osilloscope / waveform pattern testing ). Next tid bit -- there was a main reason why Merc changed the position of the water pressure sensor in the early 496 s behind the water impeller housing and moved it to the power steering cooler because of the RFI and EMI for a jist of info.

The wires I have offer very high interference suppression plus they look great. Also they dress up an all vanilla ( black ) engine to give it a little bling plus they perform very well. Most boaters feedback is always a really good to excellent, just saying. The blue sleeving was tested by me in an oven at 500 degrees for one hour. I actually pulled it out with my fingers - not hot nor discolored any shape or form. I am told the blue sleeving is good up to 1100 degrees. Its made in France fyi. That is the only part of the wire not made in the USA. Anyways soon I should have them again. The blue sleeving was months out and if you notice I tried like heck to match it up to Merc racing blue with the French company.

 

[UnWoke]

Thanks guys for putting my name on this and I was told about the post. Yes this would be John. The wires I have is MY DESIGN and tested. Moroso makes them to my specs. Moroso extrudes the inner core in house plus builds them in house for me exclusively. You not find them anywhere else. There is alot more to ohms and looks of spark plug wires. For one the boots especially for the coil boots, the 496 ign. coil boots need to be a high premium grade silicone inwhich is expensive. Then we have the fitment of the boots to the coil tower and the spark plugs plus preventing the back feed of any spark. Big difference here vs all other 496 wires. I hate to even post some info because all I am doing is helping out others for their manu of 496 wires. These companies never even seen a marine 496 more of less even scanned one plus know zero about these PCM 555 's controllers .

Next info, Scotts does not manufacturer any of the wires, they buy spools of wire and put them together. MSD is China wires and alot of those cheap wires are not USA made nor offer enough interference suppression if any at all. Not what you want for these marine engines.

Next we have the electrically interference RFI and EMI inwhich the 496 pcm 555 and the two knock sensors can not stand ( osilloscope / waveform pattern testing ). Next tid bit -- there was a main reason why Merc changed the position of the water pressure sensor in the early 496 s behind the water impeller housing and moved it to the power steering cooler because of the RFI and EMI for a jist of info.

The wires I have offer very high interference suppression plus they look great. Also they dress up an all vanilla ( black ) engine to give it a little bling plus they perform very well. Most boaters feedback is always a really good to excellent, just saying. The blue sleeving was tested by me in an oven at 500 degrees for one hour. I actually pulled it out with my fingers - not hot nor discolored any shape or form. I am told the blue sleeving is good up to 1100 degrees. Its made in France fyi. That is the only part of the wire not made in the USA. Anyways soon I should have them again. The blue sleeving was months out and if you notice I tried like heck to match it up to Merc racing blue with the French company.

Thanks John…I’m the one who talked to you…I’m ready for a set as soon as they’re available.

 

[Lavey 29]

And WHY I brought up about the boots for the 496 s wires. This pic below KNOCKED OUT the ign coil driver in the PCM 555. Why the boots are so important and this is coming from a guy whom inspects , tests , repairs and even remans marine ecms EVERYDAY for a living. I know what they hate and fails them. ------- the boot was under side shorting out against the valve cover so it was hidden and failed the ecm in short order ... The white tells the story as well ( big arcing ). Buy quality wires and change them more than you would ever think so for marine apps.

 

[Lavey 29]

All of the wires posted are meh at best. Here is a much higher quality set for less.

MerCruiser 496 Marine Set | Spark Plug Wires

sparkplugwires.com

They did not even get the PIC right for the 496 wires - the ign coil boots in their pic will not even work period for the 496 coils - I guess they know zero about the marine 496 s if they can not get the pic right to begin with. Just saying

Glad to help them out when this post gets back to Scotts. Lets see how fast they change their pic

 

[Fun Times]

496 wires

Just wondering and because of the trust found in you to the marine world, are you doing anything else fit to size plug wire wise for the other Merc engines such as let's say 1993 - 2000ish MEFI 502, 454 Mag, 7.4 MPI's, big block thunderbolt ignitions or just doing the 496's?

 

[Runs2rch]

They did not even get the PIC right for the 496 wires - the ign coil boots in their pic will not even work period for the 496 coils - I guess they know zero about the marine 496 s if they can not get the pic right to begin with. Just saying

Glad to help them out when this post gets back to Scotts. Lets see how fast they change their pic

Many products sold don't have the actual pic posted.

 

[Runs2rch]

Just wondering and because of the trust found in you to the marine world, are you doing anything else fit to size plug wire wise for the other Merc engines such as let's say 1993 - 2000ish MEFI 502, 454 Mag, 7.4 MPI's, big block thunderbolt ignitions or just doing the 496's?

He has big block sets as well. Have a few sets. Very high quality, fitment is very good.

 

[River Dirt 2]

Thanks guys for putting my name on this and I was told about the post. Yes this would be John. The wires I have is MY DESIGN and tested. Moroso makes them to my specs. Moroso extrudes the inner core in house plus builds them in house for me exclusively. You will not find them anywhere else. There is alot more to ohms and looks of spark plug wires. For one the boots especially for the coil boots, the 496 ign. coil boots need to be a high premium grade silicone inwhich is expensive. Then we have the fitment of the boots to the coil tower and the spark plugs plus preventing the back feed of any spark. Big difference here vs all other 496 wires. I hate to even post some info because all I am doing is helping out others for their manu of 496 wires. These companies never even seen a marine 496 more of less even scanned one plus know zero about these PCM 555 's controllers .

Next info, Scotts does not manufacturer any of the wires, they buy spools of wire and put them together. MSD is China wires and alot of those cheap wires are not USA made nor offer enough interference suppression if any at all. Not what you want for these marine engines.

Next we have the electrically interference RFI and EMI inwhich the 496 pcm 555 and the two knock sensors can not stand ( osilloscope / waveform pattern testing ). Next tid bit -- there was a main reason why Merc changed the position of the water pressure sensor in the early 496 s behind the water impeller housing and moved it to the power steering cooler because of the RFI and EMI for a jist of info.

The wires I have offer very high interference suppression plus they look great. Also they dress up an all vanilla ( black ) engine to give it a little bling plus they perform very well. Most boaters feedback is always a really good to excellent, just saying. The blue sleeving was tested by me in an oven at 500 degrees for one hour. I actually pulled it out with my fingers - not hot nor discolored any shape or form. I am told the blue sleeving is good up to 1100 degrees. Its made in France fyi. That is the only part of the wire not made in the USA. Anyways soon I should have them again. The blue sleeving was months out and if you notice I tried like heck to match it up to Merc racing blue with the French company.

I would like a set as well when they become available

 

[UnWoke]

I have a set of Scotts coming now…I’ll report back on the quality and functionality….my understanding is they are being ran on the NASCAR circuit…if true, they can’t suck.

 

[UnWoke]

Got my Scott wires, they appear to be top-notch and very well made. They are built to perfect length and easy to install…well, the port side anyway.
I highly recommend these. Don’t at all be afraid to make the purchase.

 

[Runs2rch]

Got my Scott wires, they appear to be top-notch and very well made. They are built to perfect length and easy to install…well, the port side anyway.
I highly recommend these. Don’t at all be afraid to make the purchase.

Just installed a couple of sets. They are very good wires.

 

[UnWoke]

Just installed a couple of sets. They are very good wires.

Yes they are…thanks for making me aware of them.