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aboamal
10-01-2010, 11:00 PM
Hi
I need help in choosing suitable spark plug for my engine
The specification for my engine as following
SBC 383 with 10.8:1 CR
AFR cylinder head 210(AFR-1054)
Solid roller camshaft (LUN-60132) with 1.6 rocker arm
Advertised Duration 273 int./279 exh
Valve Lift with Factory Rocker Arm Ratio 0.578 int./0.585 exh

chevman24
10-01-2010, 11:20 PM
You should have gotten paperwork with the heads that tells you a recommended plug type and heat range. Perhaps they have something online if you didnt recieve paperwork?
IMO you should have bought Dart heads

lun40119
10-01-2010, 11:20 PM
NGK 7's in whatever flavor you want :)

ComaxRacing
10-01-2010, 11:53 PM
What he said. -7 heat range or equivalent

Corey

lun40119
10-02-2010, 12:37 AM
Hi Corey, how is the bullet coming along???

ComaxRacing
10-02-2010, 02:12 AM
I've been fitting exhaust pushrods for the last while. Manton set me up with killer pushrods but they are taking some massaging to get them to fit. Intakes are 7/16 x 1/2" x .188 wall tapers, and the exhausts are straight wall 1/2" x .188. Intakes fit with no problems but the exhausts are taking some extensive grinding to fit. I have all but 2 done, the ones between the intake ports I'm doing very carefully because I don't want to hurt the heads.

I'll put some pictures up when I get some time.

Corey

PS. Sorry about the Hijack but it was Jakes fault. :)

chrisw1173
10-02-2010, 06:32 AM
Why come on the dart board and ask for help when you run afr ....... like they said 7s.....

blown71nova
10-02-2010, 03:31 PM
Hi
I need help in choosing suitable spark plug for my engine
The specification for my engine as following
SBC 383 with 10.8:1 CR
AFR cylinder head 210(AFR-1054)
Solid roller camshaft (LUN-60132) with 1.6 rocker arm
Advertised Duration 273 int./279 exh
Valve Lift with Factory Rocker Arm Ratio 0.578 int./0.585 exh

Ngk 5671a-7 or 5672a-7or8 depending on your use

want-a-be
10-03-2010, 03:57 AM
Why come on the dart board and ask for help when you run afr ....... like they said 7s.....

LOL....I have to admit that the same thought went through my mind. But we have had other non-Dart users here that ask for help, and they are accepted and helped out. He isn't going to afr because he can't. Can't go to their web site because they don't have one, and can't call them because they don't/won't lend technical support. I've heard from more then one customer of theirs that they are hard to deal with on the phone.

That being said,....I'm glad to have you here on the Dart Board aboamal. Ask any question you need help with.

Don

aboamal
10-03-2010, 02:29 PM
LOL....I have to admit that the same thought went through my mind. But we have had other non-Dart users here that ask for help, and they are accepted and helped out. He isn't going to afr because he can't. Can't go to their web site because they don't have one, and can't call them because they don't/won't lend technical support. I've heard from more then one customer of theirs that they are hard to deal with on the phone.

That being said,....I'm glad to have you here on the Dart Board aboamal. Ask any question you need help with.

Don

thanks this is the best answer I have heard

Awesome Bill
10-08-2010, 12:40 PM
Hi
I need help in choosing suitable spark plug for my engine
The specification for my engine as following
SBC 383 with 10.8:1 CR
AFR cylinder head 210(AFR-1054)
Solid roller camshaft (LUN-60132) with 1.6 rocker arm
Advertised Duration 273 int./279 exh
Valve Lift with Factory Rocker Arm Ratio 0.578 int./0.585 exh

AR3935 Autolite or R56719 NGK, you don't need paperwork!

lun40119
10-09-2010, 01:52 AM
9's at 10.8:1??????

Awesome Bill
10-09-2010, 12:54 PM
9's at 10.8:1??????

Jake, come on, these are race plugs and are very cool compared to the normal resistor style extended tip plug. I have run 9's and AR3935 in my nitrous engines with no problems. A colder plug will not make power like a hotter plug for this application. He is very safe with 9's or AR3935.

lun40119
10-09-2010, 11:11 PM
NGK 7's are the same heat range as the 3935's..................OP, 9's are way too cold for your engine. I think Bill may have been huffing one of those blue bottles lately. LOL..................9's. Bill you crack me up.

Besides, why on earth would you run a non projected tip with a flat top. I learned that one on my own too..............the electrode is is barely in the chamber on my heads.

ComaxRacing
10-10-2010, 12:04 AM
i'm with Jake on this one, a -9 is way to cold for a N/A motor with 10.8CR. I used to run the -9's on my blower motor @ 27psi worked great but N/A @ 10.8 static?. Bill said he used to run then in his nitrous motor perfect plug for that.

-7's

Corey

lekid
10-10-2010, 12:42 AM
On my old setup, with 10.8:1 cr we ran -9 non-projected for a 225hp of nitrous!

I am no expert, but I would recommend also a -7 projected, maybe a -8 projected, but I would definetly run a projected plug on a flat top N/A.

Awesome Bill
10-10-2010, 12:19 PM
NGK 7's are the same heat range as the 3935's..................OP, 9's are way too cold for your engine. I think Bill may have been huffing one of those blue bottles lately. LOL..................9's. Bill you crack me up.

Besides, why on earth would you run a non projected tip with a flat top. I learned that one on my own too..............the electrode is is barely in the chamber on my heads.

Yeah my bad, just to many #'s your right, the smaller the # with NGK the hotter the plug, I do get those messed up sometimes. The Autolite # I got right so I must be right! I have run the electrode even with a washer seat to a seated type with the plug way in the hole on the dyno, It made no HP difference. I had a guy come in and when I looked @ the plug I said man am I going to get him some help. TO MY SURPRISE, NOTHING GAINED, I felt funny! Stuck my foot right in my mouth. Good catch Jake.

Awesome Bill
10-10-2010, 12:20 PM
i'm with Jake on this one, a -9 is way to cold for a N/A motor with 10.8CR. I used to run the -9's on my blower motor @ 27psi worked great but N/A @ 10.8 static?. Bill said he used to run then in his nitrous motor perfect plug for that.

-7's

Corey

I got the Autolite # right Corey! lol give me just a 50 on that test!