D17 series 1 plugs

Luke470 · Jan 18, 2020

I believe I've asked a similar question before. And based on the answer I bought Delco plugs.

Need new plugs and the parts store gave me autolite platinum AP25.

They said these crossed with the R45. Checking on the one website I know I can't find the R45/AP25 cross. Does anyone know if the AP25 will work in the series 1 D17 with 3/8" reach?

As always thanks.

VACLee · Jan 18, 2020

Don't know about the heat range but it is a tapered seat plug so it won't work reguardless.

old · Jan 18, 2020

If I remember right I put NGK3112 plugs in my D-17 and my WD45. The NGK plugs seem to hold up better then any plugs I have ever used

Jim.ME · Jan 19, 2020

They must have crossed one of the AC R45T (tapered seat) series plugs to get the AP25. Whatever they did, it is wrong as posted by VAClee.

From references I looked at, it looks like the AC Delco R45 (this is a resistor plug) crosses to an Autolite 306 or NGK 3522 BR6S.

The plain AC 45 crosses to an Autolite 295 or NGK 3210 B-4.

I have been using the NGK's in my CA and D14s with good results.

Luke470 · Jan 19, 2020

Thanks very much. I really appreciate the replies! Not being able to find the AP 25 was making me think I couldn't read cross references. Glad to know that I can and aren't crazy!

D17 series 1 plugs

Luke470

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VACLee

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old

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Jim.ME

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Luke470

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