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Spark plug gap for olds 455 with hei and msd box with 10.4.1 compression

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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emissionwiz
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SOURCE: '77 Chevy C-10. Spark plug gap and timing degrees

8 degrees BTDC (6 in calif) spark plug gap 0.45"

Posted on Sep 11, 2009

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SOURCE: wiring an hei distributor

You shouldn't need a spark box because thee coil is located in the dist. cap. You need to run a 12v switched power source to the side of the dist. cap that is marked dist. if it isn't maked it is the term. that is on the front right of the conector pad. the one on the left is for hooking up a tach.

Posted on Oct 07, 2009

moparownr
  • 667 Answers

SOURCE: 460 points out hei in

The setting for the plug gap on a model with HEI ignition is 0.44. Hope this helps, let me know.

Posted on Oct 26, 2009

SOURCE: what is the firing order for a 455 olds with hei

i am not shure i guess 18436572 turn like clockwise

Posted on Mar 07, 2010

  • 437 Answers

SOURCE: i do my own auto

the point gap sounds good the timing could go up a bit to 8 plugs at 35 sounds better remember you can move the timing a bit to get a little better performance once the vechicle is at opperating temp you can powerbrake it to see if its sluggush or pinning if sluggish advance a bit if pinning back it down till it doesnt ping any more then shut the car off and restart if the the starter drags abit back the timing down a degree or two the exact numbers wont really apply due to wear on the engine and timing assy this is the easiest way to get the best performance

Posted on Feb 19, 2011

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Wiring directions for a 04 impala l,, to a msd 6 al box


Jason, I am not sure that is the correct ignition box for your vehicle, contact MSD to see what would be best for your application. Instructions for hooking up MSD, Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
http://documents.msdperformance.com/6425.pdf
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1955 olds 88 hei ignition wiring to key and ignition system


Original system has a resistor wire between coil + and ignition key, to reduce voltage and thus increase amps to give fatter spark and increase fuel mileage. For HEI system, this resistor wire must not be used, so run new primary wire straight from switch "run" to coil +. There should already be a wire from the starter solenoid to the coil + to supply full 12 volts when cranking to give higher voltage spark to plugs to help jump the gap better for use while starting. The MSD web site has much more info.

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How do i gap 455 hp olds engine


Make sure you didn't pull the coil wire off the at either end and spark isn't getting through. Unless they are way over gaped the engine should start.

Oct 13, 2014 | Cars & Trucks

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Can someone tell me what I need to gAp the spark plugs on a 78 cutlass with a v 8


Olds engine .060 chev engine .045 both with HEI ignition.

May 13, 2014 | Cars & Trucks

1 Answer

INSTALLING HEI IGNITION AND NEED HELP


i have no issues WITH CAPS, used to have a home computer in 70s with ASR33 printing terminal that did all caps..... all the time.
Is this a 1990 jeep? and what engine? you never stated the engine
4.2 L AMC straight-6 engine?

what distributor are you running off what engine, and what year.
is it with full mech, advance and vacuum advance , pre 1986?
the nutter bypass, 4.2L
it cuts the ECU out of spark controls.

this means ECU advance is killed, on now only the dumb
module runs advance.
the stock system had a ballast resistance wire. and the
start wire to the the coil bypasses this wire. for full coil power.
this is not used in HEI.
infact there are many HEI setups. which one. 7wire. ?

here is 7
http://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/ew7hei.gif


if i had your rig, it upgrade it to MSD. sure would. done many.
by doing that , all the mystery of parts, that works ends.
if you need help, spec out your set up, including, schematic
and BOM, parts used, p/n of parts used.

here are 3 HEI ( 4,5,7 pin)

http://brianesser.com/tech/wiring/msd/WDTN_pn9615_Page_030.jpg

The biggest issues is spark timing curves.
getting them right for those Webers.
and standalone spark controls win here.

the right way
http://www.jegs.com/p/MSD-Ignition/MSD-Ignition-Controller-for-GM-EFI-Carbureted-LS-Engines/758329/10002/-1

You tune the spark advance for YOUR engine and setup.
not that funky stock spark box and nutter mod.

my guess, is you burned up the ballast when it hit the real
inside distributor coil primary, that is totally the wrong coil
for a ballast. I hope it dont burn up a good coil,,,,,,,
The coil and all wiring for EFI must be correct
and the bypass for starting , is useless. for that distrubutor
because it runs 12v all the time, so if the ballast did stay good
the HEI would be running way too low , at 8v. running.
and would fail.
here is a great HEI page, under dev. but is good.

http://www.crankshaftcoalition.com/wiki/Hot_rodding_the_HEI_distributor

this link above shows how to get HEI right on a carb car
but fails to show the benefits of true spark advance tuning.
Great fuel economy can be attained under light loads
with large spark advance. and then less under full load.
(no pinging too)
The spark advance , allows the flame front to start at the correct time
to take advantage of piston rod angles.... and not send unburned fuel out the exhaust.
Id put an MSD in there and tune it carefully, I would. (webers a given)_

Feb 03, 2014 | 1990 Jeep Wrangler

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Spark plug gap 1981 Pontiac Bonneville 307 Olds V8


It is on the radiator support label

HEI System could be .060 gap

But I would be sure because some motors
used less .043 or whatever

Google the question

Aug 31, 2013 | Pontiac Cars & Trucks

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I am trrying to install a msd street fire distributor #8362 hei other than the wires from the coil what wires from the plug that went directly to the old distributor do I need to hook up to the new on


Hello! The Mad Street #8362 is not for a seven pin, computer controlled engine...It is for a five pin distributor...I believe your engine has a seven pin connector...The correct distributor is a: MSD Ignition 8555Guru...saailer

Feb 12, 2012 | 1990 GMC Sierra

1 Answer

I changed plugs on my 455 olds an when i gap them at .035 it starts but if i gap them at .045 it wont hit at all?


What year is the vehicle and engine, and is the ignition system an electronic HEI (High Energy Ignition) distributor, or the old style breaker points ignition distributor.

Sep 13, 2010 | 1992 Oldsmobile Cutlass Ciera

1 Answer

What is the firing order for a 455 olds with hei


i am not shure i guess 18436572 turn like clockwise

Mar 07, 2010 | 1970 Oldsmobile 442

1 Answer

Wiring an hei distributor


You shouldn't need a spark box because thee coil is located in the dist. cap. You need to run a 12v switched power source to the side of the dist. cap that is marked dist. if it isn't maked it is the term. that is on the front right of the conector pad. the one on the left is for hooking up a tach.

Oct 04, 2009 | 1986 Chevrolet C1500

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