Uh i'm kinda confused here I bought the recomended autolite 25's for E7 heads but they wont even thread in???


the thread is a lot shorter than the current autolite 104's I have also


I'm lost shouldn't the spark plug be able to work on my engine? (302)

 

help?!?!?!?!

 

Why not get Motorcraft plugs?

My 95 F150 has the E7 heads. It calls for Motorcraft SP-502 for platinum and SP-450 for copper. OR Autolite AP25 or APP25.

I don't see why they won't fit. Are you positive you have E7 heads?

I usually run the Motorcraft platinums in my truck, but have the APP25 Autolites in it right now because they were on sale. They fit fine.

I run Motorcraft copper in my 65 Stang because it has aluminum heads.

 

my heads are def cast iron..... i'm not positive they are e7 is there any way to check without removing the head?


if not i'll just put the 25's on my dads 41 ford since he needs new plugs but i am so confused right now


i thought autolite 104s and autolite 25s were the same threading

 

According to Summit the 104 and the 25 are the same thread size but the 104 has a longer reach than the 25. It should thread in. Sometimes they can be hard to get started, especially with headers. Also make sure you use some anti seize on the threads but don't get it on the rest of the plug.

http://store.summitracing.com/partde...5&autoview=sku

http://store.summitracing.com/partde...5&autoview=sku

 

what is anti-sieze?

is it like loc tite?

 

No, it's a thread lubricant that prevents the threads from galling and getting stuck over time from heat. It's extremely heat resistant and is essential to preventing damage to aluminum threads. It's silver and if you look at it, it gets all over everything. It's messy, but should always be used.

 

What he said. It also resists corrosion rust etc.

I always use it on spark plugs for every car/truck I work on, but yes it is essential for aluminum heads.

 

Antisieze should really be used on nearly all threads anyway, if for no other reason than to get accurate torque readings. Either that or a moly lube. I typically use moly lube on all engine internal bolts, and antisieze on all engine external, and liquid teflon thread sealer on any bolt that will be in contact with coolant. Teflon tape for pipe fittings/sensors.

 

well do you think if i go get some anti-seize the thing will start threading because i tried and i tried and couldn't get it to thread by hand or with the tool