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11-30-2014, 03:17 PM | #1 |
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Join Date: May 2010
Posts: 82
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spark plug heat range
I am running a 59A block with punched .125 oversize piston, 4" Merury crank , 1077B cam with dual 97 Strombergs carbs Is the Autolite 216 spark plugs hot enough or do I need something hotter . Thanks in advance
Bill |
12-06-2014, 08:09 PM | #2 |
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Location: western Pa.
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Re: spark plug heat range
I cannot answer your question but our engines are similar. I have Edelbrock heads, dual 97s, 4 inch crank and bored .145, H & H 355 lift 274 duration cam and Fentons. The heads came with a card saying use Champion RYC12 plugs. Those plugs run rich. I went up one step to RYC14 plugs. Try different plugs as they are relatively cheap. Heat range charts can be found on the net
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12-07-2014, 04:25 AM | #3 |
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Re: spark plug heat range
I also have a similar engine and the autolite 216s work ok for me.
Mart. |
12-07-2014, 03:51 PM | #4 |
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Re: spark plug heat range
My engine is a 276ci with offy .400 heads. I ran Autolite 216 and it ran OK. When I had to replace the head gaskets I found the 216's didn't reach far enough. I found Autolite 4092 or 4093 to be longer than 216. I'm using 4093 and chamfered the hole back to the plug. Engine seems to run better.
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12-07-2014, 04:03 PM | #5 |
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Re: spark plug heat range
Those Offy heads call for 3/4in. plugs. Autolite has then in the same het range as 216. I think there 14--something. Walt
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12-07-2014, 04:31 PM | #6 |
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Re: spark plug heat range
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12-07-2014, 10:57 PM | #7 |
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Re: spark plug heat range
The correct Champion number is RJ14YC (#63). I set mine at .028.
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12-08-2014, 07:29 AM | #8 |
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Re: spark plug heat range
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12-08-2014, 09:57 AM | #9 |
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Re: spark plug heat range
Walt,
The plugs are regular tip. I don't know how old the heads are. They are marked .400. I cc'd them and they were 60-62 cc's. Don't know much about the engine as I was LIED to sooooo much about the truck when I bought it! It wasn't running when I bought it. The valve lift is .325 inches. Can you shed some light on what I might have? After getting this engine fixed and tuned properly it runs real good! Also, got 18+ mpg this summer on a 500+ mile trip! |
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