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HEI 258 question |
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warweapon762 
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Joined: Jan/27/2014 Location: United States Status: Offline Points: 153 |
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 Topic: HEI 258 questionPosted: Nov/22/2014 at 8:47pm |
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I'm planning on installing my HEI in the 258 next weekend and I was wondering what degree before top dead center should I run it at?
The cam is stock for now and I am running a 4 barrel carb, but I am getting the HEI electronics all wired in and everything kind of setup before I upgrade the cam. Thanks! |
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carnuck
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Joined: Mar/31/2010 Location: Seattle Status: Offline Points: 3942 |
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Posted: Nov/22/2014 at 9:37pm |
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If you have a vacuum gauge, I set it just before the highest idle vacuum point is reached. Probably @10BTDC but it depends on gas, altitude
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Pdok
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Joined: Apr/03/2011 Location: Alabama Status: Offline Points: 1025 |
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Posted: Nov/23/2014 at 7:40am |
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Between 8 - 12° is a good range, in my experience. Don't forget your spark plug gap, though. 0.045" is a good place to start there.
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76 Grem X 258/904,4.0 head/MPFI, Comp X250H cam, Hughes springs, Clifford header, serpentine swap.
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warweapon762
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Joined: Jan/27/2014 Location: United States Status: Offline Points: 153 |
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Posted: Nov/23/2014 at 7:58am |
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Thanks guys, you are always helpful!
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