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Re: Autolite 3294 plugs in Iron heads?
[Re: 2734bbl]
#1944833
11/04/15 02:51 AM
11/04/15 02:51 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Circle Track
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Lincoln Nebraska
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they project a fair bit into the chamber with an 452 head.
the threads do or the insulator/ground electrode does? Cant have threads in there. EDIT I ain't sure of the # but iirc I used those in my mag heads
Last edited by RapidRobert; 11/04/15 03:14 AM.
live every 24 hour block of time like it's your last day on earth
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Re: Autolite 3294 plugs in Iron heads?
[Re: 2734bbl]
#1944837
11/04/15 03:00 AM
11/04/15 03:00 AM
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Joined: Feb 2010
Posts: 155 Tulsa oklahoma USA
2734bbl
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There are 4-5 threads showing in the chamber.
Is there a 5/8 head plug that would work? They are a lot easier to get in with my TTi headers.
Last edited by 2734bbl; 11/04/15 03:02 AM.
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Re: Autolite 3294 plugs in Iron heads?
[Re: 2734bbl]
#1944838
11/04/15 03:05 AM
11/04/15 03:05 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Circle Track
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not sure what is avail in a 5/8 plug of the right length
live every 24 hour block of time like it's your last day on earth
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Re: Autolite 3294 plugs in Iron heads?
[Re: 2734bbl]
#1944897
11/04/15 09:57 AM
11/04/15 09:57 AM
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Joined: May 2005
Posts: 4,742 Florida
BDW
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Re: Autolite 3294 plugs in Iron heads?
[Re: lewtot184]
#1944947
11/04/15 12:00 PM
11/04/15 12:00 PM
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Joined: Jan 2003
Posts: 75,070 U.S.S.A.
JohnRR
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those are the wrong plugs. they're 3/4" reach and iron heads use 3/8" reach. use an autolite 85. Late 452 heads in motorhomes, and what are termed POLICE motors, used the peanut plugs because of the extra cooling passages that run around either side of the plug and into the block, they do not use the standard mopar 3/8 reach plug.
running up my post count some more .
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Re: Autolite 3294 plugs in Iron heads?
[Re: JohnRR]
#1944984
11/04/15 01:15 PM
11/04/15 01:15 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Is the "peanut" plug a 3/8 reach with a 5/8 hex? EDIT brand/part #
Last edited by RapidRobert; 11/04/15 01:40 PM.
live every 24 hour block of time like it's your last day on earth
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Re: Autolite 3294 plugs in Iron heads?
[Re: 2734bbl]
#1945012
11/04/15 02:29 PM
11/04/15 02:29 PM
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Joined: Feb 2010
Posts: 155 Tulsa oklahoma USA
2734bbl
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OK, after looking again this morning the motorhome 452 head has a tapered seat with 6 threads in the hole. The other 452 heads I have that I swapped on because they already had the springs I needed and a better valve job have a flat seat and 6 threads.
The 906 I checked the 3294s in last night had flat seat with 4 threads in hole and 3 threads showing in the chamber.
So yes, Im still not sure on the plug number I need because a 3/8 reach plug would be short in the hole to me.
Last edited by 2734bbl; 11/04/15 02:53 PM.
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Re: Autolite 3294 plugs in Iron heads?
[Re: 2734bbl]
#1945122
11/04/15 06:14 PM
11/04/15 06:14 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
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I Live Here
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There aren't a whole lot of different thread configurations. Gasketed or tapered seat. 3/8" reach or 3/4". That gives you four combinations. Your bigblock Mopar head has tapered seats. The only plug that will work is a 3/8" reach tapered seat plug, it will use a 5/8" wrench.
A-C R43TS or 44 or 45 or 46 Autolite 25 or, I think, 26 Denso 5029 Champion 18 or 25 etc. Uses the same plug as a 1970 454 chevy or '72 350.
Beyond that you are thinking too hard or worrying too much.
The attached picture shows the plug you need.
R.
Last edited by dogdays; 11/04/15 06:20 PM.
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