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02-21-2011, 10:18 PM
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#1 |
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Registered User
Join Date: Feb 2010
Location: salem oregon
Posts: 225
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HEI * spark plug question
ok, here i go. i have a 1971 GMC 3500 (Longhorn?) with a transplanted 1975 454. It does have an HEI. Problem is, one head is an older 396 head. Each head has a different spark plug length! i am going to put NGK V-power plugs in, but will need to get 4 plugs with 1/2" threads and 4 plugs with 3/4" threads.by this i mean thread length. this does not bother me (too much). My question is, should i gap the 396 head with 3/4" length tread plugs @ .35, or @ .60? remember i have an HEI dizzy, and was told with this dizzy to gap plugs at .60. or should i gap at .35?
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02-21-2011, 11:45 PM
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#2 |
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Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,229
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Re: HEI * spark plug question
.045 on all of them.
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02-22-2011, 02:51 AM
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#3 |
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Registered User
Join Date: Nov 2010
Location: Grand Terrace, Ca.
Posts: 1,607
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Re: HEI * spark plug question
You should put on a matched set of heads...just saying.
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02-22-2011, 12:48 PM
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#4 |
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Registered User
Join Date: Feb 2010
Location: salem oregon
Posts: 225
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Re: HEI * spark plug question
yeah, matching heads is the right way. but were on motor when i bought truck. PO always used long reach plugs in both heads, and i did not notice difference till a day or so ago, when i went to change plugs.
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02-22-2011, 05:44 PM
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#5 | |
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Registered User
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,165
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Re: HEI * spark plug question
Quote:
It would bug me to death to have them mismatched.
__________________
'83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project |
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