Question about 1985 GMC C2500

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Timing for a 1985 GMC 454 engine

What dose the timing need to be set at on a 85 Gmc 454 engine and if it is bore or after top dead center

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Timing is always before top dead centre . Check the specifics but generally 10-15 degrees bftdc

Posted on Mar 29, 2014

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Firing order diagram and timing degrees 1989 gmc 1500 series 350 engine


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Jan 06, 2016 | GMC Cars & Trucks

1 Answer

How to get number 1 cylinder top dead center when motor is not running on a gmc 4.3 1991


With truck off, you can turn the crankshaft nut from bottom of engine. To bring to top dead center. Remove #1 plug and insert a straw or similar into plug hole on top of piston. When the piston just starts to go back down from all the way up, that's top dead center, The number one cylinder in the 4.3 V-6 is the front wire on the driver-side of the engine. God-Bless!

Mar 03, 2015 | 1991 GMC C1500

1 Answer

Cant get my distributor installed correctly in 1994 gmc 1500 has a 350 in it?


if you didnot mark rotor orientation before removing pyt engine on top dead center # 1 cyl line roter up to #1 plugwire post on dist cap with a light look down the shaft bore for a slot that matches the end of dist shaft if they do not match p[osition get a long screw driver an turn the shaft in engine until they do then drop dist you may have to turn the rotor backwards about a tooth when you start to drop whn the cam and dist gears mesh it will line up oil pump drive shaft to dist shaft

Mar 30, 2012 | 1994 GMC Sierra

3 Answers

I put a new engine not a rebuilt in 1992 gmc c1500 5.7 it has no power . why not ??


Usually this means that the timing needs to be set again, until it is 100% right.


  1. Remove the timing cover. This will allow access to the timing chain.
  2. Crank the engine until the timing marks on both sprockets are nearest each other and in line between the shaft centers.
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Here's a diagram -- often these are as good as pictures --

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The "A" points to the 2 timing marks visible in the photo above.

Mar 15, 2011 | 1991 GMC C1500

1 Answer

How do i align the crankshaft with the camshaft on my 85 chev 350 engne to get the timing chain in the right place. thanx


Turn the crank shaft until #1 pistion is top dead center to the top of the cilinder head Hope this helps.

Aug 12, 2010 | GMC C1500 Cars & Trucks

1 Answer

Installed new crate engine 1997 5.7 vortec, how do you adjust the timing? 1997 GMC Serria 4x4 1500


The ignition timing is not adjusted with a timing light or with the engine running, and to set the ignition timing follow these proceedures.

There is a mark or notch on the distributor housing that the rotor should be pointing to when the engine is on top dead center. This "static" timing is all that matters and the computer will be able to control the timing as long as the ignition rotor is in that position when the engine is at top dead center.

1. Place the engine at top dead center.

2. Look under the distributor cap and find where the number one terminal runs under the distributor cap, and where that position on the distributor cap corresponds with the distributor housing, and it should match up to a mark or a notch on the distributor housing indicating the number one position.

3. With the engine on top dead center the ignition rotor should be pointing to the number one mark or notch that is on the distributor housing, if it is not then loosen up the distributor and turn the distributor until the ignition rotor is pointing to the mark or notch on the distributor housing and then tighten down the distributor, the engine should now be static timed.

If the distributor can not be turned enough to align the ignition rotor with the number one mark on the distributor housing, or the distributor does not set properly and will not allow the installation of the spark plug wires then the distributor is not installed correctly and is most likely a tooth off and it will need to be re-installed correctly. (The distributor should set like it is shown in the firing order diagram when it is properly installed)

Here is a firing order diagram to also help assist you.


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Jul 06, 2010 | 1997 GMC Sierra K2500

1 Answer

Ive got a 2 wheel drive 85 gmc suburban 3/4ton with 454 and turbo 400. when i baught it there was a noise comin from tranny but only in first gear. it had no problems with shifting till i moved and towed a...


you can try flushing it using Seafome and replace your filter and fluid adding some trans tune with the new oil can git this things from most part stores . Hope this helps.

May 03, 2010 | 1985 GMC Suburban

1 Answer

Need specks for timing a 1989 gmc 2500 v 6


need engine size 5.0/5.7.6.4 with or without deistributor without dist it is automatic with could be anywhere between 3-12*BTDC (before Top dead center)

Jan 21, 2010 | 1989 GMC Sierra

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