Spark Plug Gap on a 75 with HEI

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Oct 26, 2002 | 08:16 AM

MrAzz74

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Joined: Oct 2002

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From: San Bernardino CA

Spark Plug Gap on a 75 with HEI

I have a 75 Stingray and was wondering if anyone knew the spark plug gap for that year. I have an HEI which has the Pertronix Flamethrower rebuild kit on it!! I have Bosch Platinum plugs also!! Thanks in advance for any help!!

Joe :seeya

Oct 26, 2002 | 08:42 AM

Larry B.

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From: Orlando Floriduh

Re: Spark Plug Gap on a 75 with HEI (MrASS74)

I believe the early HEI used a .060 gap.

Oct 26, 2002 | 09:47 AM

page62

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From: Coming home from Luckenbach Texas

Re: Spark Plug Gap on a 75 with HEI (MrASS74)

My '79 with stock HEI uses a .045 gap.

Oct 26, 2002 | 11:24 AM

GrandSportC3

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From: Lakeland, FL

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St. Jude Donor '03, '06, '17

Re: Spark Plug Gap on a 75 with HEI (page62)

Quote:

My '79 with stock HEI uses a .045 gap.

wow - that's a pretty big gap for a stock HEI... I use .045 with 50000 Volt HEI and MSD... Maybe I should increase my gap to .050...

:cheers:

Olivier

Oct 26, 2002 | 12:43 PM

pws69

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From: Eastern US XX

Re: Spark Plug Gap on a 75 with HEI (GrandSportC3)

I had a '76 Olds Cutlass once and the gap was somewhere between .060 and .080!! So I would try .060.

Oct 26, 2002 | 12:53 PM

joe73vette

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From: Eastern Connecticut

Re: Spark Plug Gap on a 75 with HEI (pws69)

The early HEI's specified a gap of .060", but they had problems with burning thru the rotors after a lot of miles, and the infamous red dust and frozen advance weights. So the later ones were changed to .045". That should work for you. Joe