Spark Plug Gap
Thread Starter
Joined: Mar 2007
Posts: 1,698
Likes: 3
From: NE Pennsylvania
Car: 85 Iroc-Z
Engine: 383 TPI Procharger D1SC
Transmission: TKO600
Axle/Gears: Strange S60 3.73
Spark Plug Gap
My car is an 85 IROC with a tuned Port Injection motor out of an 88 in it. I have the stock AC Delco plugs for it. Should they be gapped at .035 or .045?
Supreme Member
Joined: Mar 2002
Posts: 4,812
Likes: 0
From: 62656
Car: 1991 S10 pickup 2700lbs
Engine: 4.3L Z TBI
Transmission: 700R4
Axle/Gears: 3.08 7.625"
Re: Spark Plug Gap
AFAIK all were .045
look on your engine emission sticker under the hood
it will say
good luck
look on your engine emission sticker under the hood
it will say
good luck
Thread Starter
Joined: Mar 2007
Posts: 1,698
Likes: 3
From: NE Pennsylvania
Car: 85 Iroc-Z
Engine: 383 TPI Procharger D1SC
Transmission: TKO600
Axle/Gears: Strange S60 3.73
Re: Spark Plug Gap
wasnt sure since the motor was from a later year. my emission sticker is missing anyway.
Supreme Member
Joined: Mar 2002
Posts: 4,812
Likes: 0
From: 62656
Car: 1991 S10 pickup 2700lbs
Engine: 4.3L Z TBI
Transmission: 700R4
Axle/Gears: 3.08 7.625"
Re: Spark Plug Gap
ok i looked in the book and wow i am wrong
.035 was common later on in the 80s
i alkways assumed al sbc were .045 after 74
hum.
wonder why they wanted 10 thousandths smaller gap with later stuff
wierd,..,.,
1988:
vin code digit F 5.0L 5011 spark hap .035
timing 6* BTDC
fuel pressure 40-47PSI
vin code E 5.0L 5011 spark gap .035 timing 6* BTDC fuel pressure 9-13PSI
vin code 8 5.7L 5733 spark gap .035 timing 6*BTDC fuel pressure 40-47psi
.035 was common later on in the 80s
i alkways assumed al sbc were .045 after 74
hum.
wonder why they wanted 10 thousandths smaller gap with later stuff
wierd,..,.,
1988:
vin code digit F 5.0L 5011 spark hap .035
timing 6* BTDC
fuel pressure 40-47PSI
vin code E 5.0L 5011 spark gap .035 timing 6* BTDC fuel pressure 9-13PSI
vin code 8 5.7L 5733 spark gap .035 timing 6*BTDC fuel pressure 40-47psi
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