I am currently running Morotcraft AGSF32C plugs in my aluminum GT-40 heads N/A but when I add the S-trim what plug should I use? Do I need to run a heat range cooler? Which is the next cooler Motorcraft plug? What are you guys running?
Thanks,
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I am currently running Morotcraft AGSF32C plugs in my aluminum GT-40 heads N/A but when I add the S-trim what plug should I use? Do I need to run a heat range cooler? Which is the next cooler Motorcraft plug? What are you guys running?
Thanks,
Typically run 2 heat ranges colder plug than a stock application, not sure of the Motorcraft part# though.
Anybody running aluminum GT-40 heads with a blower? What plugs are you using?
You might.Quote:
Originally posted by darknotch
Do I need to run a heat range cooler?
There isn't one, have to look elsewhere.Quote:
Which is the next cooler Motorcraft plug?
I went from the [[EDIT]] NGK TR5 (std) to their TR6 (1 step cooler) and the plugs look *much* happier. The Autolite Race equivalent to the TR5 is the AR764, std. Autolite is 764, not sure if there is a cooler 763 or not...Quote:
What are you guys running?
Go to NAPA and get 3923's.
That is the part number and they are very good plugs.
Interesting, the Autolite.com cross-reference for their race plugs shows the following:
Autolite AR3923 = Champion RC9YC = NGK BKR6E
Autolite AR3924 = Champion RC12YC = NGK FR5
Or looking at it from the NGK side 95 Lightning & Cobra-R:
NGK TR5 = AR764 = RS12YC
NGK TR6 = AR103 = RS9YC
I have the feeling the different numbers are minor variations in seat type and thread depth, but they should all work in the Y303s and GT40/Lightning heads wrt seat depth. I have the iron heads which may not need as much thread engagement as the alloy heads, so I can use the fully threaded long-reach plugs but the Y303 guys can't use the short-threaded long-reach plugs. :confused:
Here's the Autolite cross-reference
http://www.autolite.com/tech/RacingCrossRef.pdf
Chris- I've had this problem in the past, finding part#s for plugs for my iron GT-40s. I had NGKs (TR6s, but I don't think that is the part#, just heat range), that were 2 ranges cooler I think, and I've also run the autolite 764s (1 range colder). Is the AR103 and RS9YC 2 ranges colder then stock? The seats are different, on our GT-40 heads they are tapered, and stock heads are not(so not sure on the seat of the Champ plug), as for thread depth, not sure. I basically want to run the coldest plug I can with my iron GT-40s, and it is a PITA to find it, the 764s I've learned to accept. Any more info from anyone would be great, I know I'm not the only one.
-Rob
Actually, I think I answered my own question after looking at your link. I found this to http://www.accufabracing.com/denso_2.htm
I prefer to run the shrouded electrode spark plug. I use the AR3934 on my car. I have had the best luck with them.
Chris,
What heads are you running?
TFS Twisted Wedge. An AR 3934 is identical to the AR3924, but the center electrode is shrouded.
hmm thanks chris.......one new thing to try this spring. You've tried them all i imagine?
FYI
There does appear to be a Motorcraft plug cooler than the AGSF-32C for supercharged applications using the aluminum GT-40 head. www.spmotorsports.com/mustang_plugs.html suggests the Motorcraft AGSF-22C.