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Old 07-15-2012, 11:54 PM
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bosch platinum 4 spark plugs in a 454 ? or best plug...

im looking at buying a set of plugs for my 85 454 and i saw these in the carter book i got for the truck. it said they were once seen as snake oil but actually increased power and mpg.

then i read that they really dont, and american vehicles hate them... so idk what to think.


is there a plug that everyone used in there stock 454 that they recommend using? and gap? i dont really care about the 2-4 prong hype, i was just looking up good plugs for my truck

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Old 07-16-2012, 04:59 AM
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I like the ac delcos with the extended tips for my 454. r44 -xt
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Old 07-16-2012, 07:19 AM
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Agreed. AC/Delco is original to all GM cars and trucks. CANNOT "go wrong' with them.

Platinum plugs work VERY well in the proper environements. If your vehicle is still equipped with a catalyst, and operating temperature is maintained above 190 (F), the self-cleaning properties of the platinum are excellent. Once temps drop below 180 (F), the effect is lost. They can and will "foul" quite easily if mixture goes "fat".

FWIW

Jim
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Old 07-16-2012, 07:23 AM
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^^^Yep, what they said. Stick with good old AC's.
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