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Old 04-24-2012, 11:15 AM   #1
AsphaltsCry
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Default What spark plugs?

Originally 95 ra swap. Been running pfr6g's, but never changed them when I replaced block with ej257. And later new style coils.

Are these still correct or do I use the longer sti plugs. Forged pistons too, but should match originals. Hmm

Also heads are ej25d
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Old 04-24-2012, 11:42 AM   #2
suberdave
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use the correct plugs for the heads. if you are still using the RA heads, than use the pfr6g's if you want to go one step colder go with the pfr7g's (NGK stock #4644)

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Old 04-24-2012, 01:34 PM   #3
AsphaltsCry
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Makes sense, match plugs with heads.

however the ej25d heads I am using have smaller combustion chambers due to the ej257 pistons not coming above the deck as in ej20g.

if this it's true then it would seem like another plug would be appropriate. Hmm

Thanks for your thoughts
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Old 04-28-2012, 08:17 PM   #4
AsphaltsCry
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Bumpasaurus
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Old 04-29-2012, 01:35 AM   #5
suberdave
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I dont see why you bumped this. do you still have a question?

if you use the EJ257 plugs they will go right through the top of you piston... they are to long.

use the plugs i posted if you are using any EJ20G EJ20K EJ20H EJ20R EJ25D EJ22T EJ22G EJ205 EJ207 heads.

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