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i replaced the plugs with a/c's when i bought the car but now im reading here and there about gaps, heat range etc. i need suggestions (and reasons for em) for my 307,w/edelbrock performace pkg. i used hotter plugs (why i don't know, just sounded cool in the parts store i guess) and i have an HEI set up. i need some good suggestions for plugs and gap ranges to get this thing to run Topps.

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members.aol.com/jnkb2cool/chevelle5.jpg John Krenn
1970 malibu SS look-a-like well kinda
307/200-4r

Ft.Worth, Tx
 

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HEI's can run wider plug ranges. A larger gap helps in burning more fuel.

Generally most people run .035-.045" with HEI. I personally use .045", I didn't get any better results with going wider than this. Try different gaps, if you start getting a miss at idle, chances are your too wide.

There really is no reason to run a hotter plug unless your having fowling problems. Though, if you are, and it doesn't seem to be hurting anything, then there is no problem. Your 307 is probably fairly low compression, so you won't have to worry about detonaton unless you go really hot.

Wes
 
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