Autolite Plug Question!

91LX_5L

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I went to the autoparts store that carries Autolite (im in Canada) and I told them I wanted 3924s or 3925s. They said that those are not the right plug there smaller for probes etc.

They told me I needed Autolite 25s.

I have H/C/I (iron heads). I thought all you guys with iron heads ran 3924 or 3925? Or do I have my numbers wrong and he is right?

Also he said to gap at .054 I was thinking .050 is that good?

THANKS AND SORRY FOR THIS STUPID PLUG QUESTION AGAIN!

 

Stangfreak95

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For my AFR aluminium heads I run autolite 24's.

 

Stangfreak95

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sorry didnt answer the rest. The gapping is dead on. Between .052 and .054. Since you have iron heads, I'm pretty sure those 25's are the right ones.

 

91LX_5L

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well I was told the 24s/25s are good for alum heads where as the 39xx are better for iron? or am I just confuised?

 

cavscout371

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I know trick flow recommends 3924's for my heads.

 

91LX_5L

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yours iron? see the guy said 39xx are tottaly wrong and that " 'you' guys are lieing to me". and that I need 24/25s.

So 3924s/3925s will be fine? I've been told to run the warmer plug possible is that true so which should I run?

thanks again!

 

cavscout371

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no mine are aluminum

the xx25's are warmer and yes there fine as long as you arnt running a bottle

are they stock iron heads or what are they if aftermarket

 

cavscout371

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the major difference between the two is the reach the 24/25 has a 0.460 reach while the 3924/3925 has a 0.750 reach so its really going to depend on the head you have.

 

91LX_5L

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I have Windsor Jr. heads. Iron. Made by world products.

http://www.midfloridamotorsportsperformance.com/castings/sbford.html

I belive those are them.

Thanks for the help!

 

cavscout371

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my thinking is that if it maintains the stock valve angle go with the 25's but I'll try to do some research for you

 

cavscout371

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I just checked the world products catolog for you and it will be the 25's because it call for a plug w/ 0.460 reach

so good luck on the head install

 

91LX_5L

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Sweet! Thanks man. You made it all clear for me.

So 25s it is. What should I gap them to .050?

Thanks again,
Matt

 

cavscout371

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no prob and yeah 50 should be fine

 

91LX_5L

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sorry for being ignorant but would .050 be optimal for me? I've never really gapped plugs before...stock is .054 some people say .045-.048 so yea what do you think?

thanks again man wish I could help u in return

 

Stangfreak95

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Yes this is fine dude .050

 

91LX_5L

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thank Q!

MAN GAS HERE IS 1.03 (canadian but still thats ****in insane) so I guess im not going to advance my timing for a while

 

cavscout371

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yeah thats damn close to what where paying here in uspstate, NY its like 2.60 american gal (which I think is basically 3 liters) for premium it sucks

 

Stangfreak95

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cavscout371 said:

yeah thats damn close to what where paying here in uspstate, NY its like 2.60 american gal (which I think is basically 3 liters) for premium it sucks

Click to expand...

I was in Ogdensburg Ny today and the gas was 2.43 or 2.63 cant remember. A US gallon = 3.8L CAN. So basicly I did the conversion and by filling up in the states I was saving about .15$ per liter, from what we pay around here which is about .90-.96$/liter lately... You guys are still paying the gas way cheaper than us.

And BTW-------------------> This is my 3000posts

 

mo_dingo

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Depth of the spark plug is the issue here, not warm/cold. It depends on the heads.

If you had the heads off, I could tell you instantly, but with the heads off the car, you need to consult the manufacturer of the heads, or find an article which uses them to tell you the proper depth plugs.
Scott

 

cavscout371

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mo_dingo said:

Depth of the spark plug is the issue here, not warm/cold. It depends on the heads.

If you had the heads off, I could tell you instantly, but with the heads off the car, you need to consult the manufacturer of the heads, or find an article which uses them to tell you the proper depth plugs.
Scott

Click to expand...

yes thats the reach (reach = depth) issue I that I resolved for him the heads have a stock 0.460 reach and not the longer 0.750 reach I got it from world themselves.