#1 Senior Member
Join Date: Mar 2002
Location: The nation's capital
Posts: 2,420
Car: 91 RS
Engine: 350 TBI
Transmission: 700R4
Ideal spark plug gap?
For my brand new 350 TBI I picked up some AC Delco plugs today. I was wondering if yall have any advice as to what to gap them at.
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OLD LO3 = 180 HP - 263 lb/ft (open element & advanced timing)
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#2 Supreme Member
Join Date: Jul 1999
Location: Oakdale, Ca
Posts: 4,311
Car: 89 IrocZ
Engine: L98-ish
Transmission: 700R4
:::::::180 HP - 263 lb/ft (open element & advanced timing) ::::::
#3 Member
Join Date: Oct 2003
Location: Edinburgh, Scotland
Posts: 354
Car: 1985 Chevy Camaro IROC-Z
Engine: 350ci from 79camaro
Transmission: 5 speed manual on lsd
The MSD instructions tell you to add about 0.1 to the gap so that would make 0.45.
#4 Senior Member
Join Date: Aug 2001
Location: Placerville, CA, USA
Posts: 642
Car: 88 IROC-Z - original owner!
Engine: LB9 with K&Ns, MSD, Foil, Taylor
Transmission: BW T-5
Axle/Gears: BW 9-bolt, 3.45
Uhh, not 0.1, but 0.01. You surely don't want a half-inch gap. Since he has a hot ignition box that will probably fire anything, I'd try going from the stock .035 to maybe .040. Try it there, see how the motor likes it. You might try .045 next time.
#5 Supreme Member
Join Date: Apr 2002
Location: New Jersey
Posts: 3,500
Car: 86 Corvette, 89 IROC, 1999 TA
Engine: 350, 350, LS1
Transmission: 700r4, 700r4, T-56
Axle/Gears: 3.07, 373, 4.10
Quote:
Originally posted by 8Mike9 :::::::180 HP - 263 lb/ft (open element & advanced timing) ::::::
I believe those are the figures for the stock 305 he swapped out and now hes asking about his modded 350 which he indicated in his post.
#6 Member
Join Date: Oct 2003
Location: Edinburgh, Scotland
Posts: 354
Car: 1985 Chevy Camaro IROC-Z
Engine: 350ci from 79camaro
Transmission: 5 speed manual on lsd
yeah sorry did indeed mean 0.01", but that is indeed what the msd instructions said. But yeah 0.040 would be better than 0.035".
#7 Senior Member
Join Date: Mar 2002
Location: The nation's capital
Posts: 2,420
Car: 91 RS
Engine: 350 TBI
Transmission: 700R4
I went with .045 guys. I'm trying to do it once, because there's NO WAY I'm getting those suckers out after it's in the engine bay.
Those numbers are indeed with the 305.
ThirdGen
1992 Camaro
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Tags 001 , 350 , 88 , camaro , chevy , flow , gap , inch , iroc , msd , plug , plugs , proper , spark , tbi , trick
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