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06-26-2012, 04:51 AM
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Member
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Join Date: Jun 16, 2010
Location: North Carolina
Posts: 33
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HEI and spark plug gap
Hi I just installed an HEI with built in coil and am wondering what gap should the plugs be. I have mine gapped at 35 is it recommended to gap them to 40-45?
75 stock 360 engine, 2 bb.
Thanks
Last edited by carolinaslim : 06-26-2012 at 04:58 AM.
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06-26-2012, 05:11 AM
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FSJ Maniac
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Mine are gapped to 45
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Justin
'72 J2000 360 4bbl T18 D20
'96 ZJ
"It's all about the fun-per-gallon vs the miles-per-gallon"-- Gamber68
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06-26-2012, 06:33 AM
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FSJ Maniac
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Join Date: Dec 11, 2004
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You can leave them at 35 or gap them to 45. You are very unlikely to notice the difference. GM ran their plugs at 35 with HEI and it was their design.
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Originally posted by Ristow flowmasters sound like canned crap they're all built the same, just the higher numbers put the crap in a bigger can.
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06-26-2012, 08:15 AM
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Gear Head
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Join Date: Oct 18, 2008
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Cant say that I've ever seen GM's calling for the plugs to be gapped @ .035 w/HEI? Norm is .045 but for a few short years GM DID have them gapped @ .060! But for a stock HEI, .045 will work just fine.
Some of the aftermarket versions of the HEI call for gaps up to .055.
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-Lance
1988 Grand Wagoneer...in pieces
1974 J10 258,no trans or t-case yet,d44's 4.09's
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Originally Posted by REDONE
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06-26-2012, 09:07 AM
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FSJ Maniac
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Yep, you're right my memory was not too good on the plug gaps from my carb'd Chevy days 14-15 years ago. I do remember at least one of my El Caminos having .035-.045 as an acceptable gap range.
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Quote:
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Originally posted by Ristow flowmasters sound like canned crap they're all built the same, just the higher numbers put the crap in a bigger can.
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06-26-2012, 11:18 AM
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Gear Head
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Join Date: May 04, 2012
Location: Reno NV
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i was unaware that you need to gap more with an hei. i believe my plugs are gapped at .33 wich is what the sticker said on the jeep. would i see a difference with a .45 ?
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06-26-2012, 11:25 AM
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Join Date: Jul 30, 2003
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Chevy generally used .045 except on some 454's. Olds and Pontiac had quite a few that were .060 and some Olds were .080
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Mark B. Jones
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Originally Posted by GrandWag&Prix
Actually, now that I think about it, that could be either awesome or really terrible.
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'76 401 Wagoneer
'79 Chief "Junaluska"
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06-27-2012, 12:38 AM
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Member
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Join Date: Jun 16, 2010
Location: North Carolina
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Gapped mine to 45 for now. I see no difference.
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06-27-2012, 06:24 AM
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Join Date: Jul 30, 2003
Location: Normal, Oklahoma
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I'm not surprised. You might if its the dead of winter going for a cold start.
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Mark B. Jones
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Originally Posted by GrandWag&Prix
Actually, now that I think about it, that could be either awesome or really terrible.
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'76 401 Wagoneer
'79 Chief "Junaluska"
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06-27-2012, 06:30 AM
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FSJ Maniac
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Join Date: Dec 11, 2004
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Quote:
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Originally Posted by 710 Burner
I'm not surprised. You might if its the dead of winter going for a cold start.
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Yep, no surprise at all. There might be a slight difference in 0* weather, might....
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Quote:
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Originally posted by Ristow flowmasters sound like canned crap they're all built the same, just the higher numbers put the crap in a bigger can.
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