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Paul
Cochise

USA
776 Posts

Posted - 29 Dec 2012 :  7:38:39 PM  Show Profile  Reply with Quote
I have a 74 Pontiac 455 bored 30 over, 9.5/1 compression with #13 iron heads off a 1970 Pontiac 400,with a TH-400 tranny,in the 77 T/A. What spark plug would be good to use? What temp range? Its a street car that probably wont see the track.
Thanks,
Paul

Paul
Cochise

USA
776 Posts

Posted - 31 Dec 2012 :  9:11:18 PM  Show Profile  Reply with Quote
Oh yea the 455 has a Accell HEI Distributor.
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cortcomp
Coyote

USA
5335 Posts

Posted - 31 Dec 2012 :  9:23:13 PM  Show Profile  Visit cortcomp's Homepage  Reply with Quote
I just go to the parts store and ask what plugs they spec for whatever year the heads are. I think those heads MAY be AC45? Or rt45 or something? regardless, check on the year of the heads, not on the year of the block. I forget which year they went from gasket seal to taper seal.
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Paul
Cochise

USA
776 Posts

Posted - 31 Dec 2012 :  10:27:28 PM  Show Profile  Reply with Quote
Thanks Cort. The heads are off a 70 400. It makes sense to buy plugs for that year. I don't know if they are the taper or washer type. The parts guy will know. I ask cuz I've seen alot of hype for the E3 plugs and wonder if they out perform the A.C. welcome plugs.
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Blued and Painted
Chief PONTIAC

USA
3404 Posts

Posted - 01 Jan 2013 :  12:10:17 AM  Show Profile  Reply with Quote
E3--- just more snake oil. IMO


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.
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Blued and Painted
Chief PONTIAC

USA
3404 Posts

Posted - 01 Jan 2013 :  12:28:40 PM  Show Profile  Reply with Quote
The hair stood up on my neck when i read the above desctiption but i checked some old posts and found you used some dished postons. I was trying to think of a good plug for 11.2 to 1.. Anyway, I use jap plugs in jap cars, Bosch in german cars. motorcraft in fords, and AC Delco in GM cars. When somthing works i stick with it.


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.
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Paul
Cochise

USA
776 Posts

Posted - 02 Jan 2013 :  5:13:39 PM  Show Profile  Reply with Quote
The heads c.c. at 72, just like the factory said so I had My pistons dished to yeild 9.5/1 compression.
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Total Jackass
Tribal Scout

0 Posts

Posted - 14 Jan 2014 :  04:39:24 AM  Show Profile  Reply with Quote
Pretty useful info here. BTW, I think I read a especially similar article on another blog today, in fact i'm pretty certain. I 'll check it out and let you know, maybe they copied your content, who knows.
http://www.coswatches.net/rolex-jubilee-gents.html

I'm a first class jerk and don't you forget it!
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Phil
The Great White Buffalo

USA
7214 Posts

Posted - 14 Jan 2014 :  6:32:05 PM  Show Profile  Reply with Quote
TTT

Bowties are for Pee-wee Herman. "Chevy": even the name sounds cheap, but not as cheap as your Pontiac will be with an LS transplant.
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