Denso W14P-U plugs

[William F.]

Anybody know where I can purchase these nonresistor extended tip plugs? The resistor version is available but Denso has discontinued this non resistor version. Found 6 on Amazon, but need 2 more-none on flea bay.
Thanks,
'67 L79

[Jack H.]

Re: Denso W14P-U plugs

How about these: http://www.sparktecmotorsports.com/w14p-u.html

I have a '67 L79 also. Are these "THE" plugs to use in your opinion?

[Bryan H.]

Re: Denso W14P-U plugs

i purchased them on EBAY by doing the search....werent cheap but still cheaper than the original A/C's

[Dennis O.]

Re: Denso W14P-U plugs

Geez, I'm really sorry guys; I bought 8 from a guy in Canada. and he said he was sick and tired of dealing with the drama, so he sold me the rest of his inventory for $.50 per plug. I have enough for my cars, so I am open to selling a couple of sets for a reasonable price. I am not looking to screw over anyone, so the prices will be reasonable.

PM me.

[William F.]

Re: Denso W14P-U plugs

I'm interested in these Denso plugs since they are non resistor and in my experience, L79's need a good spark to get to redline without a miss. Duke also likes the U groove electrode; so I thought I's try to find some. Do others think the resistor veersion of this plug or other resistor brands such as AC R45S (extened tip which is in engine now-Denso also extended tip) are just as good? Am I working too hard to find a nonresistor plug?

[Duke W.]

Re: Denso W14P-U plugs

If you can find W14-U, which is a non projected tip plug and equivalent to the AC 45, why not use them. Also, the NGK B4 is equivalent to the Denso W14-U and AC 45.

Duke

[William F.]

Re: Denso W14P-U plugs

Dennis,Let me know what you want for them and I'll buy a set. I also sent you an e-mail on same subject.
Thanks
William Ford
'67 L79/C60 marina blue/bright blue coupe

[William F.]

Re: Denso W14P-U plugs

Duke,
Don't you not think the extended tip design offers better non fouling properties? I run a mixture of leaded race gas (I know, I know, but my engine has close to actual 11:1 compression) and non ethanol 93 pump gas; so, I'm going to get more chance of fouling due to lead.That's why I want the extended tip-your thoughts?
Thanks

[Duke W.]

Re: Denso W14P-U plugs

As long as you stick with the equivalent of AC heat range 5, I don't think there will be any difference between the normal tip and extended tip as far as fouling is concerned.

The L-79 has a very lazy centrifugal curve and 93 PON = 98 RON, so I question your need for leaded race gas. Have you tried straight 93 PON pump gas and tested for detonation?

Duke

[William F.]

Re: Denso W14P-U plugs

Sparktec doesn't have any.

[William F.]

Re: Denso W14P-U plugs

Unfortunately, Dennis's were the non extended tip version. Anybody know where to get W14P-U extended tip plugs? Accell #8170(same as their 137) looks like a Denso W14P-U but cross references to a 44 heat rqange. Their #138 jumps to a 46 cross reference heat range. Anybody used either of these Accel plugs?If choice between a nonresistor nonextended tip vs resistor extended tip plug in 45 heat range on an 11:1 compression L79, which would you choose?
Thanks

[John D.]

Re: Denso W14P-U plugs

I'm morally opposed to using anything named Denso in my 67 Corvette.....have same AC 45's in car for over ten years and it runs fine..

[Wayne M.]

Re: Denso W14P-U plugs

I'm interested in these Denso plugs ..... Duke also likes the U groove electrode; so I thought I's try to find some.

Here's the U-groove electrode on a Denso W16FS-U.

[Dennis O.]

Re: Denso W14P-U plugs

I am morally oppossed to over spending; have you priced AC45's lately?

[John D.]

Re: Denso W14P-U plugs

AC Delco R45S are $2.29 each at Autozone...