View Full Version : Spark plug question for a 1988 351 indmar

09-01-2012, 11:37 PM
Question guys I was just at Walmart today and grabbed some spark plugs I guess I was not paying much attention and in a rush ,I grabbed autolite
AP 24. Not just the 24. Will these
Platinum ones still work fine
I just noticed the difference as I went to gap them.


east tx skier
09-02-2012, 09:52 AM
From my recollection, you want to run the copper ones. The platinum will "work," but the temperature is not optimum.

09-02-2012, 06:22 PM
thanks i guess i will try them now that i opened a pack i did a search on autolite's website .
for a ford 351 i think bronco and they recommend the plats .but also suggested the copper.

shouldn't they be the correct heat range . just the platinum ones would last longer .?

don't they both have copper core just different tips . oh well maybe someone else will have more input .


east tx skier
09-03-2012, 05:11 PM
I can't recall the specifics, but I bought the platinum tips, asked about it on here, and based on the answer, returned them for the copper plugs. Good luck.

Panda Cub
09-03-2012, 05:14 PM
Bought mine through skidim.

09-03-2012, 09:01 PM
thanks i will probably try them and just get the copper plugs also for next year after winterization

cheers i will report back on the plats , my mechanic buddy firgures the plat should be fine .

09-04-2012, 11:58 AM
Copper is a better conductor, but platinum lasts a lot longer. The heat range on both is the same.

Next time, save your money and stick with copper... but I wouldnt hesitate to use the platinums since youve already got them on hand.

10-18-2012, 07:27 PM
The plat plugs are still cheap at Walmart.
Small update ran the boat with the plat plugs the last 5 outings and don't notice any difference. Boat ran great through out the full rpm range.