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Author Topic:   Spark Plug?
BIGDADDYBOZ
Dirt Freak

Total posts: 466
posted March 21, 2005 12:45 PM  
I have a 358 with domes and double humps tried a r43ts in it and it just hits the edge of the dome. What plugs do people run for this? Thanks

[This message has been edited by BIGDADDYBOZ (edited March 21, 2005).]

Istock66
unregistered Total posts: 466
posted March 21, 2005 01:58 PM           send a private message to BIGDADDYBOZ   Edit/Delete Message   Reply w/QuoteBBBBBB
autolite 133 or whatever brand you want interchanged with this number..

its a non projected tip peanut plug


ss99
Dirt Maniac

Total posts: 120
posted March 22, 2005 10:59 AM  
Autolite 353 is the flat, gasket seat plug you want. It's a non-projected plug with the correct seating for the camel hump heads.

The 133 is a tapered seat (peanut) plug - wrong one.


19J
Dirt Freak

Total posts: 370
posted March 22, 2005 11:12 AM  
Everyone builds motors and takes heads from different motors with no clue where they came from. My question is how do you know which spark plug to run? We just built a 360 and im wandering if we put the right plugs on it. We used 305 heads last 3 #'s 450. Autolite plugs. Thanks.

Istock66
unregistered Total posts: 370
posted March 22, 2005 12:23 PM           send a private message to 19J   Edit/Delete Message   Reply w/QuoteBBBBBB
19j if your dome piston use the non proj tip if your flat top use the projected tip listed above.

both those numbers are cold enough for 12-1 and up, if you foul them you can get hotter plugs from there.

As for gasket plugs, you guys can keep them.

I run peanut plugs in all my hump heads, allways have and allways will it works just fine. The plug seat is tapered just like on the newer heads.

Istock66
unregistered Total posts: 370
posted March 22, 2005 12:24 PM           send a private message to 19J   Edit/Delete Message   Reply w/QuoteBBBBBB
oops I thought they were both listed.

Aut 133 non proj tip
Aut 23 is the proj tip I use on flat top or angle plug heads

DMA Racing
Dirt Maniac

Total posts: 129
posted March 22, 2005 06:13 PM  
i use the aut.333 in my 461's

cobb
Dirt Maniac

Total posts: 131
posted March 22, 2005 07:03 PM  
my 'humps have have tapered seats

sideways
Dirt Forum Champ
Total posts: 715
posted March 23, 2005 08:41 AM  
I dont care for gasket plus either.But will the tapers work in all hump heads?

ss99
Dirt Maniac

Total posts: 120
posted March 24, 2005 09:30 AM  
quote:
Originally posted by Istock66:
19j if your dome piston use the non proj tip if your flat top use the projected tip listed above.

both those numbers are cold enough for 12-1 and up, if you foul them you can get hotter plugs from there.

As for gasket plugs, you guys can keep them.

I run peanut plugs in all my hump heads, allways have and allways will it works just fine. The plug seat is tapered just like on the newer heads.


OK I'm listening. What are the advantages of running a peanut plug in a head not designed for them? What is wrong in your experience with the gasket seat plugs? Not trying to start an argument hear, just learn something new.

BTW, hump heads have a very slight taper at the hole, but it's different than a head with the true tapered seat.



dirtbuster
Dirt Forum Champ
Total posts: 2007
posted March 24, 2005 09:50 AM  
19j

back to your question about what plugs to use in different heads. usually you can get close with stock reccomendations then go from there.

But there is a system. Take ACdelco R43TS plug for instance. The R means it is a resistor plug. The 4 is the thread size, the 3 is the heat range. The T means it is a taper seat plug and the S i beleive is extended tip. You might want to double check those I might be off on the S part but I think you see my point, there are also many other suffixes that could be added as well. Ask any parts store guy to show you the numbering system adn he should be able to help you.

With that information you can look at your heads and tell whether you need a gasket or taper seat plug, thread size is pretty easy to come by and you prob have an idea already what heat range to run, and most of the time you'd prob be better off without the extended tip except with flat top or dished pistons.

Somethign to keep in mind is that colder heat range plugs like 1 or 2 in an ACdelco may be hard to come by. NGK has several plugs that are even colder yet and are easy to get.

Istock66
unregistered Total posts: 2007
posted March 24, 2005 10:00 AM           send a private message to dirtbuster   Edit/Delete Message   Reply w/QuoteBBBBBB
Speaking for myself and myself only.

1. I have enough special tools for installing my 5\8 plugs. I cant imagine trying to install those that are 13/16 or 3\4 or whatever they are?

2. And also there is a much wider selection of tapered seat plugs available. All brands and heat ranges. Almost everyone stocks the autolite numbers I listed above.

3. see #1 above about 3 more times because the center 4 plugs are hard to get to on my car.


I use that same fitting to check my compression, and use that same fitting on my leakdown gauge with no problems.

If theres a factual reason I need to change from the type of plugs Ive been running since 1989 in double hump heads Im all ears and would love to learn something new that could help my raceing program!!

waltonjr1
Dirt Forum Champ
Total posts: 516
posted March 24, 2005 11:25 AM  
Ive ran ar134's in my 461's for years before switching to vortecs. Never had a problem.


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