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05-25-2008, 10:48 AM
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#1 (permalink) |
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Senior Member
Join Date: Dec 2005
Posts: 162
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Spark plug gap
I have a '73 350 with HEI. What do you guys gap your plugs at with this motor?
Chumley  |
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05-26-2008, 03:56 AM
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#2 (permalink) |
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Senior Member
Join Date: Feb 2007
Posts: 210
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73's didn't have HEI. The closest is a 75 for HEI. According to my book, It's R-46SX plugs gapped to .080, and timing at 20B.
Hope this helps.  Jim.
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05-26-2008, 05:41 AM
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#3 (permalink) |
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Moderator
Join Date: Mar 2007
Location: Northern VA
Posts: 1,752
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Agreed. Gap on an HEI should be 0.060" - 0.080"
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05-26-2008, 06:20 AM
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#4 (permalink) |
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Senior Member
Join Date: Sep 2007
Location: Pittsburgh
Posts: 102
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Damn...that's a big gap. Would that be the same for a 72 350 with HEI upgrade?
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05-26-2008, 10:03 PM
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#5 (permalink) | |
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Junior Member
Join Date: Oct 2004
Location: Southern CA
Posts: 1,064
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My book says .040 for all '72 Olds.
No reason to use more, unless cylinder pressures and/or fuel mixtures have been changed. Norm
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05-27-2008, 01:03 PM
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#6 (permalink) |
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Senior Member
Join Date: Dec 2005
Posts: 162
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The motor is a '73, and had HEI added at some point. I'm assuming it's very low compression and small valves. The old plugs were all at .035, but I'm going to go .040 with the new plugs. I run my big block Chevy at .060, and have not had any problems, but I know you can't compare apples to oranges.
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05-27-2008, 05:16 PM
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#7 (permalink) |
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Senior Member
Join Date: Mar 2008
Posts: 90
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Gap your HEI plugs no more than .060".
I usually go .045-.050". The "book" says .080 for 76-77 HEI's, it creates more problems than it solves. JMO Jim |
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05-27-2008, 05:20 PM
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#8 (permalink) | |
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Seasoned beater pilot.
Join Date: Jan 2007
Location: Chicago
Posts: 1,588
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Quote:
I also believe that Olds sent out a recall/correction page about the .080 gap issue. Changing it to .060. I remember writing it on my fan shroud years ago.
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 I'd rather have a numbers matching poker hand.
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05-27-2008, 06:00 PM
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#9 (permalink) |
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Member
Join Date: Jan 2007
Location: Long Island, New York
Posts: 50
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I have a 69 350 and took out the points distributor and changed over to an HEI. I gap my plugs at 040 and it runs great. Hope that helps.
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1969 Olds Cutlass under restoration 350 w/Turbo 400, posi rear will be in soon!: |
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05-27-2008, 08:25 PM
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#10 (permalink) |
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Senior Member
Join Date: Dec 2005
Posts: 162
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Thanks for all the input guys, I gapped them at .045, now I just have to put the new wires together, install, and see how it goes. I wish I had a '72 or older motor. The car is a '72. In '73 everything changed dramatically performance wise.
Chumley |
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