7tonemonte Posted June 18, 2023 Share Posted June 18, 2023 Anyone have a source to tell me correct spark plugs for Vortec heads casting # 12558062. Only thing I found was they are from a 1998 truck. 350 L31 Builder recommended Autolite and I got #26 but I’m second guessing myself that I needed 605. I can’t find any definitive answers thanks a lot Quote Link to comment Share on other sites More sharing options...
cny first gen 71 Posted June 18, 2023 Share Posted June 18, 2023 I use autolite 26 In mine but they aren't vortex heads, just stock heads. Quote Link to comment Share on other sites More sharing options...
7tonemonte Posted June 18, 2023 Author Share Posted June 18, 2023 1 minute ago, cny first gen 71 said: I use autolite 26 In mine but they aren't vortex heads, just stock heads. Steve, only difference I’m seeing is the 605 are 17mm reach and the 26 are 11mm. Quote Link to comment Share on other sites More sharing options...
jft69z Posted June 18, 2023 Share Posted June 18, 2023 2 hours ago, 7tonemonte said: Anyone have a source to tell me correct spark plugs for Vortec heads casting # 12558062. Only thing I found was they are from a 1998 truck. 350 L31 Builder recommended Autolite and I got #26 but I’m second guessing myself that I needed 605. I can’t find any definitive answers I went to the Autolite site, punched in 1998 Chevy truck, 5.7 engine and it spits out a 605 plug. Seems definitive to me? https://www.autolite.com/parts-finder/?ref=NoIg5gpgdhBOCGAbEAaKBXRiUgIwE58AOVEAYQAsIA3WAe0QgBdSzcBWABk9IDUiABOwB0AdlIAZAJZgKTAQBF0TAJ6kAKrHQBjANYgAukA Quote Link to comment Share on other sites More sharing options...
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