C4driver99

Has anyone had any deals with the Bosch Platinums +4??? horepower gains? Gas mileage? thanks

DarkBlue88

Gimmick all the way, Go OE.

C4driver99

Wow that sux. Thanks for the tip. Glad I didnt waste my cash.

steve1ph2

iv heard the same thing. i run autolight race plugs in mine. part number ar3924. good luck. the difference over oem not really sure. i have a racing buddy with a 69 camero that recomend them.

H P Bushrod

OE AC Delco's in my '85. No problems.

C4driver99

Yea I think i'll stick with OE . If its good enough for the factory its good enough for me

93 ragtop

What year C-4? The factory plugs on the LT1 are known for the platium pluck to come off. A lot of people use other brands due to this problem. ie. NGK

onedef92

I run Bosch plats (standard) in my DD, never tried them in the Vette. Never tried the Plus 4 models, either. Use the NGK TR-55 Platinum instead.

gslotman

I am with F92 on this. I tried the +4's - and mileage went down (shrouds the flame path from plug).........went with my old stand by TR-55s and mileage went right back up !

stubbs

In Lincoln Tech one of my instructors was a Chevy Tech, he said that a lot of cars with the +4's came in and apparently the platnum electrodes fell off, and then tumbled around inside the motor and scuffed up the bores. You couldn't pay me to run those plugs.

onedef92

I wouldn't fool with 'em, either.

C4driver99

oh **** there in my car now from the previous owner. What happens if the bores get scuffed up?

stubbs

Loss of compression and it will burn more oil.

C4driver99

Oh ok. Guess ill take them out tomorrow. Lucky me. Its a pain to change the plugs on the drivers side even with a swivel wrench and im not paying some overcharging mechanic to do it. Thanks for the info

C4driver99

As long as theres no long term damage(no idea how long theyhave been there).

EekL98

there are two diffrent tr55 one platnuim and the other is iranuim

Which would be better? Iranium sounds like it is better but not price wise.
What gaps would you recomend with both options.

I use the bosch platnuims regulars. but they are gaped to .045 instead of .035 When i used the stock gaping my gas milage went down so i gaped up till it ran better.

C4driver99

Thought you were suppose to use factory gap. Most already come pregapped.

onedef92

Go with the NGK TR-55 Double Platinums. They're excellent. If you've got pockets deeper than the average bear, try the NGK Iridiums.

EekL98

does the year actually matter when choosing plugs? I know ingnition volts and the heads do matter.

I was looking for the TR 55 duoble plat and i was not able to find them for my application.
1989 L98 ,alum head

I did find diffrent NGK's called V-power.
Any advice on these?
http://www.modulardepot.com/product_...bd9be2de695594

onedef92

I've never used them, but I've got some buddies on the F-bodies Forum who swear by the V-Power plugs for L98's. They're a copper core plug and well within the stock heat ranges, I can tell you that.

Check your service manual, but I think the stock plug gap is .050