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spark plug choice for a 10:1 383 with a 292° hyd cam? #1747280
02/05/15 01:33 PM 02/05/15 01:33 PM
Joined: Jan 2003
Posts: 9,670
Lima, Peru
domingo Offline OP
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what would you guys advice regarding spark plug choice for a 10:1 383 with a 292° hyd MP cam?

This is a street driven engine.
Re: spark plug choice for a 10:1 383 with a 292° hyd cam? [Re: domingo] #1747281
02/05/15 02:02 PM 02/05/15 02:02 PM
Joined: Jul 2004
Posts: 19,317
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Thumperdart Offline
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NGK #5...............

72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: spark plug choice for a 10:1 383 with a 292° hyd cam? [Re: Thumperdart] #1747282
02/05/15 02:14 PM 02/05/15 02:14 PM
Joined: Jan 2003
Posts: 9,670
Lima, Peru
domingo Offline OP
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cant find that on summit....can you please point me to it?

Re: spark plug choice for a 10:1 383 with a 292° hyd cam? [Re: domingo] #1747283
02/05/15 02:21 PM 02/05/15 02:21 PM
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Thumperdart Offline
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That`s the heat range(hot)but you need the stocking # I think so let me check.

72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: spark plug choice for a 10:1 383 with a 292° hyd cam? [Re: Thumperdart] #1747284
02/05/15 02:26 PM 02/05/15 02:26 PM
Joined: Jan 2003
Posts: 9,670
Lima, Peru
domingo Offline OP
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Re: spark plug choice for a 10:1 383 with a 292° hyd cam? [Re: domingo] #1747285
02/05/15 03:19 PM 02/05/15 03:19 PM
Joined: Jul 2005
Posts: 1,770
Wethersfield,CT
Ray440 Offline
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What type of cylinder head? stock cast iron or aluminum?

1969 Plymouth Road Runner 440 auto
2017 Ram 1500 Quad Cab 5.7 Hemi
Re: spark plug choice for a 10:1 383 with a 292° hyd cam? [Re: Ray440] #1747286
02/05/15 05:10 PM 02/05/15 05:10 PM
Joined: Aug 2003
Posts: 43,129
Bend,OR USA
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Cab_Burge Offline
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Quote:

What type of cylinder head? stock cast iron or aluminum?

If stock iron eads I would use a Autolite 74 or 75, try the colder #74 first and see if it and your local gas get along If aluminum then I would try the Autolite # 65 or 85(I think the # 85 are the restior plugs in 3/4 long reach, it is the same plug used in the stock SB Mopar heads )

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: spark plug choice for a 10:1 383 with a 292° hyd cam? [Re: Cab_Burge] #1747287
02/05/15 05:47 PM 02/05/15 05:47 PM
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lewtot184 Offline
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Quote:

Quote:

What type of cylinder head? stock cast iron or aluminum?

If stock iron eads I would use a Autolite 74 or 75, try the colder #74 first and see if it and your local gas get along If aluminum then I would try the Autolite # 65 or 85(I think the # 85 are the restior plugs in 3/4 long reach, it is the same plug used in the stock SB Mopar heads )

autolite 3924's for 3/4" reach. 85's are 3/8" reach.
Re: spark plug choice for a 10:1 383 with a 292° hyd cam? [Re: lewtot184] #1747288
02/05/15 05:49 PM 02/05/15 05:49 PM
Joined: Jan 2003
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Lima, Peru
domingo Offline OP
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yes, I forgot to point out these are stock cast itron heads---
Re: spark plug choice for a 10:1 383 with a 292° hyd cam? [Re: domingo] #1747289
02/05/15 05:58 PM 02/05/15 05:58 PM
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Lima, Peru
domingo Offline OP
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are RN12YC the same as RC12YC?
Re: spark plug choice for a 10:1 383 with a 292° hyd cam? [Re: lewtot184] #1747290
02/05/15 06:08 PM 02/05/15 06:08 PM
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Romeo MI
MR_P_BODY Offline
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Quote:

Quote:

Quote:

What type of cylinder head? stock cast iron or aluminum?

If stock iron eads I would use a Autolite 74 or 75, try the colder #74 first and see if it and your local gas get along If aluminum then I would try the Autolite # 65 or 85(I think the # 85 are the restior plugs in 3/4 long reach, it is the same plug used in the stock SB Mopar heads )

autolite 3924's for 3/4" reach. 85's are 3/8" reach.



I use the 3924 also for my SB which works on the
BB alum heads for anything in the 10 compression range
Re: spark plug choice for a 10:1 383 with a 292° hyd cam? [Re: domingo] #1747291
02/05/15 06:11 PM 02/05/15 06:11 PM
Joined: Jun 2003
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Romeo MI
MR_P_BODY Offline
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Quote:

are RN12YC the same as RC12YC?



N is 3/4" reach.. C is 3/8" reach
Re: spark plug choice for a 10:1 383 with a 292° hyd cam? [Re: MR_P_BODY] #1747292
02/05/15 06:15 PM 02/05/15 06:15 PM
Joined: Jan 2003
Posts: 9,670
Lima, Peru
domingo Offline OP
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which mopar heads need 3/4 reach and which need 3/8"??

im talking stock cast iron small and big block, Stock HEMI,

and also what about the stealth heads, and the edelbrock big block heads?
Re: spark plug choice for a 10:1 383 with a 292° hyd cam? [Re: domingo] #1747293
02/05/15 06:19 PM 02/05/15 06:19 PM
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Romeo MI
MR_P_BODY Offline
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Quote:

which mopar heads need 3/4 reach and which need 3/8"??

im talking stock cast iron small and big block, Stock HEMI,

and also what about the stealth heads, and the edelbrock big block heads?



Your stock iron heads use a 3/8" reach... all SB
and BB alum heads use a 3/4" reach
Re: spark plug choice for a 10:1 383 with a 292° hyd cam? [Re: MR_P_BODY] #1747294
02/05/15 06:24 PM 02/05/15 06:24 PM
Joined: Jan 2003
Posts: 9,670
Lima, Peru
domingo Offline OP
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stock big block iron 3/8"

stock small block iron 3/8"

stock HEMI ???? my aaftermarket alum heads use 3/4" not sure about stock cast iron? I guess also 3/4"?

Aluminum aftermarket Big Block 3/4"

Aluminum aftermarket small block 3/4"

is the above correct?
Re: spark plug choice for a 10:1 383 with a 292° hyd cam? [Re: domingo] #1747295
02/05/15 06:42 PM 02/05/15 06:42 PM
Joined: Aug 2003
Posts: 43,129
Bend,OR USA
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Cab_Burge Offline
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Quote:

stock big block iron 3/8"

stock small block iron 3/8" Nope, all the stock L.A SB heads use 3/4 reach plugs

stock HEMI ???? my aaftermarket alum heads use 3/4" not sure about stock cast iron? I guess also 3/4"?

Aluminum aftermarket Big Block 3/4"

Aluminum aftermarket small block 3/4"

is the above correct?

Nope, see the SB quote correction above, 426 Hemi uses 3/4 reach plugs also like the L.A. SB Mopars use

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: spark plug choice for a 10:1 383 with a 292° hyd cam? [Re: domingo] #1747296
02/05/15 06:45 PM 02/05/15 06:45 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Quote:

stock big block iron 3/8"

stock small block iron 3/8"

stock HEMI ???? my aaftermarket alum heads use 3/4" not sure about stock cast iron? I guess also 3/4"?

Aluminum aftermarket Big Block 3/4"

Aluminum aftermarket small block 3/4"

is the above correct?



All my SB stuff has been 3/4" but the rest looks right
Re: spark plug choice for a 10:1 383 with a 292° hyd cam? [Re: MR_P_BODY] #1747297
02/05/15 07:00 PM 02/05/15 07:00 PM
Joined: Jan 2003
Posts: 9,670
Lima, Peru
domingo Offline OP
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ok! got it!!!


So what plugs for my stock irom head 383 with 10:_1 compression and 292° cam? street driven.

If you guys couldd point me to a link on summit if would be awesome!!! thanks!!
Re: spark plug choice for a 10:1 383 with a 292° hyd cam? [Re: domingo] #1747298
02/05/15 07:04 PM 02/05/15 07:04 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Quote:

ok! got it!!!


So what plugs for my stock irom head 383 with 10:_1 compression and 292° cam? street driven.

If you guys couldd point me to a link on summit if would be awesome!!! thanks!!



I'll let Cab answer that for ya.. he is a BB guy with
way more experience than me on the heat range for BB
Re: spark plug choice for a 10:1 383 with a 292° hyd cam? [Re: domingo] #1747299
02/05/15 08:15 PM 02/05/15 08:15 PM
Joined: Jun 2008
Posts: 3,916
usa
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lewtot184 Offline
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Quote:

ok! got it!!!


So what plugs for my stock irom head 383 with 10:_1 compression and 292° cam? street driven.

If you guys couldd point me to a link on summit if would be awesome!!! thanks!!

try some autolite 85's and see how they burn. they're cheap, fairly easy to get.
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