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Old 06-26-2016, 10:11 PM   #1
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Setting timing on 454

Has anyone successfully set the timing on the 454? During the power steering pump replacement a couple weeks ago I located the timing marks on the bottom of the engine?! I can't imagine crawling under with a timing light and having somebody adjust the distributor from above? Anyone have experience with this task?


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Old 06-27-2016, 07:52 AM   #2
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Are you sure you don't have an upper indicator

Bob
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Old 06-27-2016, 09:47 AM   #3
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Bill, I've not used the timing mark on the bottom...yet...but will be doing so once my engine is installed in the chassis.

From experience working on my 84 310 the upper timing mark is not accessible or viewable from above, hence the addition of the lower timing marks by GM.

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You can do it by yourself but it would definitely be more time consuming!

Brad
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Old 06-27-2016, 07:18 PM   #4
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No problems checking timing from lower marks. Take proper safety precautions.

Ray J.
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Old 06-27-2016, 07:58 PM   #5
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I have to admit that on older engines, I just advance the distributor to get it just short of the point where the engine would "Ping" (pre-ignition).

Seemed to work fine!

Still do the same with my '79 mini with 1275 engine - rally cam, headers, lightened flywheel, etc., etc.

Brian.
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Old 06-27-2016, 09:08 PM   #6
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From what I remember you use the #5 plug with the lower pointer as stated above then make a new mark you can see using the #1 plug from the top.
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Old 06-29-2016, 08:40 AM   #7
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The harmonic balancer on these engines already have the proper mark for using the lower indicator with the #1 cylinder (driver's front) as the trigger.
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Old 07-02-2016, 06:16 AM   #8
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Unfortunately for me most of my work is solo, so the timing mark threw me for a loop. I replaced all the ignition components last year on a trip so didn't have my timing light and have been thinking about it since. I'll probably just check it and go from there. Thanks for the input everyone, I feel less crazy now.....


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Old 07-02-2016, 11:29 AM   #9
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Bill, I reset the timing on my 77 Argosy last summer after removing the distributer. It is not as bad as it first seems. Brad listed all of the details above. You trigger the timing light off of the No 5 cylinder when you use the lower marker. I raised the the motorhome up partially with a jack and the parking brake set and chocks on the rear wheels. There is only one mark on the balancer pulley but using the lower marker dictates the No 5 plug instead of the No 1 plug. I highlighted the marking with white chalk to increase visibility. Also I loosened the 9/16 inch distributer hold down bolt just such there was still some friction to rotate the distributer. You can slide under the front bumper to see the marks with the engine running (not far) and then slide out to go up and adjust the distributer. It did not take a lot of effort and the timing was set exactly to spec. It was better than removing doghouse covers and straining to see the upper mark which may not even be visible after all of the effort.

After getting the timing set idle operation of the engine settled down and runs quite nicely.
Good Luck
Gregg
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