I have an 88 iroc with the 350. I wanted to buy some Bosch platinum +4 spark plugs but it offers two choices for my car, cast iron or aluminum? Which do I buy? Thanks!!!

 

your l98 stock would have iron heads

 

You would have to see what type of head is on your car before you buy the plugs. If I am not mistaken they will be an iron head as the vettes had the aluminum ones (But I could be wrong). Someone else can chime in here.

Personally I have had no luck with those plugs. Put a set in and it would mis bad. My friend had them in a dodge truck and smae thing. If you are doing a plug job I say stay with the delcos (my opinion).

 

i would stick with basic ac delcos or champions.

 

Why do you want to buy Bosch platinum +4? Your car wont have any more power than a standard plug gapped the right way. Get the standard delcos.

 

Skip the Platinum +4s, they're not worth it.

 

Copper plugs are much cheaper and will work just as well. The advantage of a platinum plug is that you don't have to change them as often since they take longer to wear out. If you want to use a platinum plug, just buy a normal style version. All the gimmicks like +4, splitfire, etc do nothing.

I always laugh at the ads that claim by changing your plugs to these new "extra super special hi tech" plugs that you'll increase your fuel mileage 5%. Chances are if you just change your worn out plugs to regular new ones, you can make the same claim.

Copper plugs typically have around a 2 year life span. Platinum plugs are around 5 years but it all depends on your annual mileage. Some cars that have very difficult plugs to change normally get platinum plugs because nobody wants to change them.

I run a normal copper plug in my race car. They're NGK race plugs but they're still just a copper plug and they're cheap.

 

I run an autolite race plug. Standard, cheap, and works as it should. I change them once a season just because.