Hib Halverson
Technical Writer for Internet & Print Media
I'm cleaning out my shop and I came across some special spark plugs I was given several years ago by a guy at GM Motorsports. He wanted me to try them in an engine I was running on the chassis dyno, but they were really too cold for what I was doing.
They are AC Racing Spark Plugs PN VF438LS. When I got them, I was told that some Winston Cup Teams were using them. Makes sense as they are clearly for racing only. They are a very cold heat range, surface gap type of plug which would be good for a high-rpm engine that generates a lot of cylinder pressure. An example would be a race engine on nitrous oxide, with a supercharger or a normally aspirated race engine with a very high compression ratio. These plugs fit any head that takes a 5/8-in hex, flat-seat, 3/4-reach spark plug. GM Performance and most aftermarket (Brodix, AFR, Edelbrock etc) aluminum racing cylinder heads use a plug with those dimensions.
I have these plugs on eBay. These plugs are new...never been in an engine. If you're interested, look at:http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2435722193
They are AC Racing Spark Plugs PN VF438LS. When I got them, I was told that some Winston Cup Teams were using them. Makes sense as they are clearly for racing only. They are a very cold heat range, surface gap type of plug which would be good for a high-rpm engine that generates a lot of cylinder pressure. An example would be a race engine on nitrous oxide, with a supercharger or a normally aspirated race engine with a very high compression ratio. These plugs fit any head that takes a 5/8-in hex, flat-seat, 3/4-reach spark plug. GM Performance and most aftermarket (Brodix, AFR, Edelbrock etc) aluminum racing cylinder heads use a plug with those dimensions.
I have these plugs on eBay. These plugs are new...never been in an engine. If you're interested, look at:http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2435722193
