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04-26-2009, 08:46 PM
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#1 |
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Senior Member
 
Join Date: Feb 2003
Location: Gold Canyon Arizona
Posts: 4,383
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plug gap help?
recently changed plugs in my 72 cheyenne with a 350v8. i installed 44's and gapped at .035. a friend said because its now a hei ignition that it should be gapped larger. anyone verify this? dave
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1971 K5 CST Blazer 1951 -3100 5 window short bed 4sp 1965 Chevelle Malibu 283 (sadly sold) 1968 Camaro 327 1968 Honda mini-trail z50a #377 1966 uh 1-D Huey |
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04-26-2009, 09:00 PM
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#2 |
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Active Member
Join Date: Oct 2006
Location: Ohio
Posts: 1,643
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Re: plug gap help?
It does not have to be gapped larger - but now you CAN gap them larger
I have mine set at .045
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1968 SWB 454 + .040, 490HP x 540 FT pounds of Torque 10-1 Kb Forged pistons, recon rods w/ ARP wave loc bolts 781 heads Ported with 2.19/1.88 SSTvalves Lunati 60204 cam, Micro Trol lifters, Ported Edelbrock Performer Rpm manifold armor coated, Pertronix Triple Strike Ignition Holley 770 Street Avenger carb,Headers armor coated Built by Watson Ruppel Performance in Sarahsville Ohio. Hardshift Tranny Built Turbo 350,TSI 10" 3000 stall 12 Bolt Eaton Posi 4.10 Richmond Gears moser axles  18.5" x 31" Hoosier Pro Street Radials  ET Classic 5 Wheels - polished Power Steering, Power Brakes,Disc Brakes,Tach & Gauge Dash, Tilt,Factory Air (gone) Custom Paint & Body Work Special thanks to my wife, my son and my money tree 
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04-28-2009, 08:37 PM
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#3 |
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Registered User
Join Date: Jan 2008
Location: St.Petersburg,Fl
Posts: 1,267
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Re: plug gap help?
.045 is it.
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04-28-2009, 09:50 PM
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#4 |
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Registered User
Join Date: Oct 2005
Location: Northern Arkansas
Posts: 1,136
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Re: plug gap help?
I gap mine at .045 with HEI.
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04-28-2009, 09:53 PM
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#5 |
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Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,031
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Re: plug gap help?
Larger gap w/a hotter coil = better spark. The coil for an HEI is hot enough for a .045 gap.
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. Last edited by SCOTI; 04-28-2009 at 09:54 PM. |
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04-28-2009, 10:21 PM
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#6 |
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Gone to greener pastures
Join Date: May 2007
Location: Gateway to the Delta
Posts: 7,354
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Re: plug gap help?
IIRC, when GM 1st came out with the HEI, the gap was.060".
It didn't take them very long to close it up to .045". I'd go with .045", as others have recommended.
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'69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck |
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