The cut off year is 1974, 75 and up use the taper seat and can't use the 985's or ZFR5n's
. I had a 2.5L ram van that I managed to find Pontiac spark plugs that fit that had a longer head so there might be something else out there for later heads.
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| Proper spark plug selection is in question https://slantsix.org/forum/viewtopic.php?t=18508 |
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| Author: | Bren67Cuda904 [ Wed Jul 12, 2006 9:18 am ] |
| Post subject: | Proper spark plug selection is in question |
Someone recommended the NGK ZFR5N plug with gasket removed. The Bosch 4218 plugs are a taper fit. The Bosch was looked up at one of the local part stores. ( They maybe wrong) Are you saying you can remove the gasket on the NGK plug and get it to seal in a taper fit hole. I don't think this in correct. Is my 67 head a taper fit or gasket fit type. I do have plug tubes. |
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| Author: | '74 Sport [ Wed Jul 12, 2006 9:33 am ] |
| Post subject: | |
The taper fit plugs came in later years. I don't know when it began, but my son's '74 has the "drool" tubes, so it was after that. Jerry |
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| Author: | slantvaliant [ Wed Jul 12, 2006 9:56 am ] |
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This chart shows the plug and other head changes. http://www.slantsix.org/articles/parts-matrix/jpg.htm Also, read this thread: http://www.slantsix.org/forum/viewtopic ... tolite+985 |
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| Author: | Slant n' Rant [ Wed Jul 12, 2006 12:27 pm ] |
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The cut off year is 1974, 75 and up use the taper seat and can't use the 985's or ZFR5n's . I had a 2.5L ram van that I managed to find Pontiac spark plugs that fit that had a longer head so there might be something else out there for later heads.
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| Author: | Bren67Cuda904 [ Wed Jul 12, 2006 1:45 pm ] |
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I used the ZFR5N plugs. These are the plugs that where removed. (Autolite platuim) #2 and #6 look a bit different than the others. This motor has either 22,000 miles or 122,000 miles. (odometer rollover?) Your thoughts on the plugs. http://www.renaissanceracing.com/images ... gsfull.JPG |
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| Author: | Bren67Cuda904 [ Wed Jul 12, 2006 1:47 pm ] |
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Oh and where do I get new plug tube O-rings? |
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| Author: | Larry E Gee [ Wed Jul 12, 2006 2:48 pm ] |
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Fel-pro ES12794 Autozone Got mine @ a year ago |
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| Author: | Jeb [ Wed Jul 12, 2006 3:14 pm ] |
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Looks like your engine is running a little on the lean side. What is your timing set at? They are supposed to be a light tan color. |
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| Author: | Bren67Cuda904 [ Wed Jul 12, 2006 8:54 pm ] |
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have not checked timing. I have noticed a ping around 60 - 70 mph under light acel, but goes away as more gas is given. Running a 185 degree thermostat. |
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