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
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Joined: Jul 2005
Posts: 1,770 Wethersfield,CT
Ray440
top fuel
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top fuel
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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
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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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Joined: Jun 2008
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lewtot184
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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.
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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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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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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
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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
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Quote:
are RN12YC the same as RC12YC?
N is 3/4" reach.. C is 3/8" reach
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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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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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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
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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
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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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?
All my SB stuff has been 3/4" but the rest looks right
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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
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Joined: Jan 2003
Posts: 9,670 Lima, Peru
domingo
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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!!
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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
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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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
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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
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lewtot184
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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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