Plug ??'s

[Snowboat]

Does anyone know what a crossover would be for an Autolite AR472 Racing Plug to an NGK? I'm not very comfortable reading an Autolite.

[Fiat48]

Tell me what you are plugging and I will get you a number.
Big plug or small?
Long reach or short?
Gasketed or tapered seat?
Blown/unblown...yada..yada..

[Snowboat]

It's the wife's engine. 451, solid roller, 272 and 276 @.050", .680 and .692 lift, 8-71 under quite a bit (I forget), two 6109's, Unilite, 34'. No intercooler. Theads are closed chamber, iron, 2.19, 1.88, touched a little by me, casting #3964291 @112cc's, tapered seat, long reach. Thanks, Bob. Billy tell you the cam story?

[Fiat48]

Tapered seat long reach? Don't sound right.
Go to this website and select the plug by specs. You want an 8 heat range for that and projected tip would probably not hurt.
http://www.ngk.com/search_char.asp?seenWarning=1&manufacturerID=
Terminal type = chose all
resistor = no
Headed to lake for a few passes. Will check back.

[GofastRacer]

Does anyone know what a crossover would be for an Autolite AR472 Racing Plug to an NGK? I'm not very comfortable reading an Autolite.
That would be B9EFS ;)
Autolite! (http://www.autolite.com/tech/RacingCrossRef.pdf)

[Snowboat]

The reach is about 3/4", so it must be the .708". The tech rep (who wasn't at all sure of herself) came up with your number, Gofast, a B9EFS. I typed that # in on Fiat's site and it does come up. Think this is the right one for easy to read blown application? Thanks. Looked up theAutolite site after replying. That's a great one.

[Fiat48]

9 is a little colder. Run an 8 if you can as a safety valve...a 9 when it is tuned. The reason for the 8 is I would rather the plug show heat quick and get you to richen it to protect the motor.

[Snowboat]

I finally got ahold of a good tech rep. The hotter range, an 8, is a R5724-10, stock # 7993. An interesting side note is that they no longer manufacture their plugs with the same coating. The gold ones are all old stock. They will come with a more silver color, but still easier to read than Autolite.

[Fiat48]

Hmm. Something not right here.
a -10 is an ice cold plug. Too cold. You do not want that unless you run Nitro.
A 7993 (R5724-10) is a 5/8 hex TAPERED SEAT with a reach of .708. Now I don't know what heads you have but every Chevrolet head I ever saw came one of several ways:
#1. 13/16 Hex, gasketed 3/4 reach plug.
#2. 5/8 hex tapered seat .460 reach plug.
#3. 5/8 hex gasketed 3/4 reach plug.
Better look real close at how long those threads are in the head.

[Kindsvater Flat]

Since we are on the issue of plugs. Mine are R5671-8 NGK's. Do I use the same plug for the blower dealio?

[Fiat48]

Yes. Keep the 8's.

[INEEDAV]

Hmm. Something not right here.
a -10 is an ice cold plug. Too cold. You do not want that unless you run Nitro.
A 7993 (R5724-10) is a 5/8 hex TAPERED SEAT with a reach of .708. Now I don't know what heads you have but every Chevrolet head I ever saw came one of several ways:
#1. 13/16 Hex, gasketed 3/4 reach plug.
#2. 5/8 hex tapered seat .460 reach plug.
#3. 5/8 hex gasketed 3/4 reach plug.
Better look real close at how long those threads are in the head.
Bob
Did Ken bringing up plugs bring back a funny little memory from that trip him and I made out there a couple years ago? :rolleyes:
Billy

[Snowboat]

So much for the NGK reps. You're right again, Bob. R5674-8 is a projected tip and R5673-8 is not. After checking the Chevy books and the NGK site, I'm pretty sure these are the ones. Should I use projected tips?
No Billy. You can see I'm still getting bad local advice. That's why I keep coming to the Forums. Sent a resume to Nevada, so far.

[INEEDAV]

So much for the NGK reps. You're right again, Bob. R5674-8 is a projected tip and R5673-8 is not. After checking the Chevy books and the NGK site, I'm pretty sure these are the ones. Should I use projected tips?
No Billy. You can see I'm still getting bad local advice. That's why I keep coming to the Forums. Sent a resume to Nevada, so far.
mine or dealer?

[Fiat48]

I like projected tip plugs (when there is room and there is room in your case) because the plug stays cleaner if you putt around a lot.
Lot's of guys out there using the wrong reach plug. Saw that again last weekend on a blown gas deal.
What was the story on the cam? Don't think Billy ever told me.

[Snowboat]

Bob and Billy........just back from Canada and a 90th birthday. Billy, the advice was from the auto parts folks. Bob, Billy is talking about short reach plugs in an extended reach aluminum application, cam advice has been great. Nice trailer you've got going there. I saw Dave Sammons' setup and that would be the way I would go. There's not very much length in a 26 footer. He used the space well.
Got a cam question. Had a roller lifter lose its wheel and scuff up the cam. So much for running old stuff too long. Anyway I bought this Howard's cam, nothing like the Crane we use. Because of the springs, and a desire to try a wider lobe sep, and the price and availability, here's what I just got in the mail.
.702 .702 270 278 @ .050 114 lobe sep. IO 21 IC 69 EO 73 EC69 46' overlap. Should I install it straight up, or retard it. Going into a Howard runner, nothing special.

[GofastRacer]

Put it in straight up, adjust valves according to the ticket and try it, then go from there!..
Hey Ken, where's my CD? I'm anxious to see how the POS ran!.. :D

[Snowboat]

I haven't forgotten Art. In fact, starting to feel guilty. I need to get after the boys to get busy, since the old man is Techno-challenged. What about the cam position?

[GofastRacer]

I haven't forgotten Art. In fact, starting to feel guilty. I need to get after the boys to get busy, since the old man is Techno-challenged. What about the cam position?
No prob bud, cam position= read above post!.. :smile: :smile:

[Fiat48]

The reason I had you retard the Crane was that Crane put 4 degrees of advance into that grind.
Judging by the IO/IC numbers it looks like Howard has ground the cam straight up. Try finding the peak of the intake lobe and see if she comes up 114.
That is a smaller cam than the R284 you had in there.