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Old 03-30-2007, 08:32 PM
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Spark Plug help...

I'm having header/spark plug clearance problems on a 327 with 462 cammel hump heads. I run an R43 or R42 gasket style plug and need a plug within the same heat range that is shorter in length. I'm sure some of you guys have been down this road before, so any suggestions? I'd like to stay away from the Accel plugs-had many problems with them years ago. I ordered some Autolight race plugs that are 1/8" shorter but I think I may need a little more clearance than that. Any help would be greatly appreciated. Bob

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Old 03-31-2007, 02:08 PM
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champion has a r12yc plug that is the same length as accell u grooves, if u like champion.
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Old 03-31-2007, 07:39 PM
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I'm not a big fan of Champion but I'd run them if they'll work OK, any idea what the part number is? I understand NGK also has some shorter plugs but I have no idea yet what part number.
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Old 03-31-2007, 08:08 PM
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Quote:
Originally Posted by baddbob
I'm not a big fan of Champion but I'd run them if they'll work OK, any idea what the part number is? I understand NGK also has some shorter plugs but I have no idea yet what part number.
i think if you go to NGK's website they have a cross refference chart. you might find one the same as what had
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Old 04-02-2007, 09:56 AM
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i got the part number wrong it was rv12c champion that is the same length as accell shorty plugs
that would be the one i cross reference to an NGK
sorry
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Old 04-02-2007, 01:31 PM
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Thanks, do you have any idea how much shorter these are compared to an AC R43?
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Old 04-02-2007, 02:25 PM
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I found the Accel shorty part number 8197 listed for almost every Chev v8 ever built so there isn't any heat range selection going that route. When I cross referrenced it over to Autolite this plug came up: http://www.power-21.com/honeywellpow...px?b=A&pn=2976

It definately looks short! But will it work? What is meant by Bantam top?
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Old 04-02-2007, 02:36 PM
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Quote:
Originally Posted by baddbob
Thanks, do you have any idea how much shorter these are compared to an AC R43?
not really r44t and r43t a little longer i think that is the same plug r43 &r43t
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Old 04-02-2007, 02:38 PM
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Quote:
Originally Posted by baddbob
I found the Accel shorty part number 8197 listed for almost every Chev v8 ever built so there isn't any heat range selection going that route. When I cross referrenced it over to Autolite this plug came up: http://www.power-21.com/honeywellpow...px?b=A&pn=2976

It definately looks short! But will it work? What is meant by Bantam top?
i couldnt really veiw that website it wouldnt bring up the page complete
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Old 04-03-2007, 03:02 AM
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What about Bosch? I've been running h9bc in #461 heads since '86. I got sick of the clearance problems, checked the length and installed the tapered seat 5/8 plugs where a 13/16 gasketed plug used to live. No problems, none come loose and the Bosch - like ngk are near a 1/4 inch shorter than champions.
A lot of people seem to like ngk, I've only had grief with them. On turbo saabs in the 90s the oe ngks would open the gaps enough to create a rough idle after a GOOD flog down the freeway ( up to 20 thou change). I tried them when I had trouble finding an ultra cold plug for a 12.8:1 straight propane 400sbc in the late 90s. I had to pull timing out of it compared to 'hotter' Bosch plugs. When I finally installed a set of h6bc's the pinging stopped and I dialed in another 8 deg initial (like alky propane likes a short curve with LOTS of initial)
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Old 04-03-2007, 05:54 AM
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Here's another attempt posting a link to that Autolite plug 2976, http://www.power-21.com/honeywellpow...px?b=A&pn=2976, or just look it up by part number in the autolite search. It sure is short.
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Old 04-03-2007, 08:41 AM
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Quote:
Originally Posted by baddbob
Here's another attempt posting a link to that Autolite plug 2976, http://www.power-21.com/honeywellpow...px?b=A&pn=2976, or just look it up by part number in the autolite search. It sure is short.
its the same thing over again
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Old 04-03-2007, 08:52 AM
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i looked it up, if you meant autolite plug #2976, is a lawn mower plug
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Old 04-03-2007, 01:41 PM
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Strange how it cross refferences with the Accel plug
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Old 04-03-2007, 06:31 PM
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Quote:
Originally Posted by baddbob
Strange how it cross refferences with the Accel plug
try cross reference the champion ry12c plug
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