Author Topic: bosch spark plugs?  (Read 4631 times)

Offline 197

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bosch spark plugs?
« on: May 03, 2008, 09:50:43 PM »
I just bought a set of bosch platinum spark plugs for my 73 c20 454. Are they ok plugs? The plugs that are in it now are AC that are about 5 years old.
'73 C20 454

Offline choptop

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Re: bosch spark plugs?
« Reply #1 on: May 03, 2008, 10:06:33 PM »
i like em. never had any probs. actually reduced foulling on 275k mile 350
76 C10 Choptop,76 C10 Swb
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Offline Blazin

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Re: bosch spark plugs?
« Reply #2 on: May 03, 2008, 11:45:25 PM »
AC or Autolites are all I run in my Chevys.
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Offline 197

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Re: bosch spark plugs?
« Reply #3 on: May 04, 2008, 09:37:30 AM »
Ok, Ill still try them.
'73 C20 454

Offline VileZambonie

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Re: bosch spark plugs?
« Reply #4 on: May 04, 2008, 12:44:09 PM »
At 1st I thought they were great plugs for the $ but I have been getting a lot of failures with them and have since stopped running them. AC-Delco is #1 choice for your truck.
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Offline 197

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Re: bosch spark plugs?
« Reply #5 on: May 04, 2008, 01:48:54 PM »
What fails on them?
'73 C20 454

Offline choptop

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Re: bosch spark plugs?
« Reply #6 on: May 04, 2008, 05:24:15 PM »
I need to retract my previous statement. I read Bosch but somehow had a senior moment and thought Autolite. I run Autolite in most of my trucks, that or A/C Delco. I have run the Bosch platinums in the past but had several off them have the center electrode come out. It didn't come out all the way, just out far enough to hit the outer electrode, and cause a fouled cylinder. If you will look at the center you will see the electrode is a small wire surrounded by the porcelyn. They work good until this comes out for some reason. Sorry about the mis- understanding.
76 C10 Choptop,76 C10 Swb
85 C10, 85 K10, 85 K20,86 C10,86 K10 (all extended cabs)
86 C30 extended crewcab

Offline 197

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Re: bosch spark plugs?
« Reply #7 on: May 04, 2008, 06:10:09 PM »
Im kinda stuck on what I should do now. I was going to install these plugs tommrow.  ??? ??? ???
'73 C20 454

Offline Blue 82

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Re: bosch spark plugs?
« Reply #8 on: May 04, 2008, 07:59:24 PM »
I don't care for Bosch plugs
I've found they foul easily
I do like NGK's on small blocks
there is nothing wrong with AC's
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Offline choptop

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Re: bosch spark plugs?
« Reply #9 on: May 04, 2008, 08:32:30 PM »
Can you swap=em out for Autolites or a/c Delco ???
76 C10 Choptop,76 C10 Swb
85 C10, 85 K10, 85 K20,86 C10,86 K10 (all extended cabs)
86 C30 extended crewcab

Offline 197

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Re: bosch spark plugs?
« Reply #10 on: May 04, 2008, 08:36:24 PM »
I probley could return them but I don't know if its worth it 50miles round trip to return them.
'73 C20 454

Offline VileZambonie

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Re: bosch spark plugs?
« Reply #11 on: May 04, 2008, 08:47:29 PM »
The #1 failure I've found has been the conductive core breaks apart. The result is an increase in cyl kv firing voltage in random cylinders. Not only does this lead to cylinder misfiring but uneven cylinder balance and an overworked coil. You should run R44T in your truck
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Offline choptop

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Re: bosch spark plugs?
« Reply #12 on: May 04, 2008, 08:48:54 PM »
I am in the same boat, just next time in town, snag a set of A/C's or Autolites, and put'em in the glovebox, just in case. May not need them, but it's less than 8 bucks, and is cheaper to have them than to have to make a special trip for them. For now, I would run-em, and get the others just for backup. Vile explained it better than I did on the failures,
76 C10 Choptop,76 C10 Swb
85 C10, 85 K10, 85 K20,86 C10,86 K10 (all extended cabs)
86 C30 extended crewcab

Offline 197

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Re: bosch spark plugs?
« Reply #13 on: May 04, 2008, 09:46:02 PM »
Ok, thanks guys.

Ill install them tomorrow, and let you know how it goes. And I will also pick up a set of the R44T's and keep them in the truck just incase, when I'm in town next.
'73 C20 454

Offline 197

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Re: bosch spark plugs?
« Reply #14 on: May 05, 2008, 01:57:21 PM »
Well today I changed the oil, air filter, pcv filter, gas filter, and put the bosch plugs in. The old plug were well pretty done. Put the new ones in and it fired right up and I drove it home 6 miles and it ran fine. So I guess Ill see what happens.
'73 C20 454