spark plug heat range
- Thread starter 36coupe3w
- Start date
laryh
Member
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
estout81
BANNED
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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Walt Dupont--Me.
Well-known member
Those Offy heads call for 3/4in. plugs. Autolite has then in the same het range as 216. I think there 14--something. Walt
Walt Dupont--Me.
Well-known member
Are you using the extended tip plugs or the std tip? Walt
estout81
BANNED
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!
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!