Stock 350 Chevy Timing Assistance Please. - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-25-2010, 02:36 PM
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Stock 350 Chevy Timing Assistance Please.

Hello, need some help with timing. This engine is completely stock, what is the correct timing setting for it? Also, I have a timing tab right in the center of the timing cover from the factory, I had a chrome one laying around that bolts to the right side of the cover that I decided to put on too but it sits off to the right of the original one (as you are looking at the front of the engine - so it's on the drivers side), seems to me that it would matter that they aren't in the same physical right? So wondering why they would make one that isn't where the factory one would be. Anyway, any help on setting the timing correctly would be appreciated. I have a gun with inductive pickup so have that part covered. I really appreciate all the willingness to help me out with all this. You guys are really great. Nice to have this resource when you need help.

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Old 05-25-2010, 03:34 PM
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This is an 1986 engine by the way
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Old 05-25-2010, 03:53 PM
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My original Camaro motor was an 86 with the timing tab in the center,
timing was 0º @ 500rpm.
Time it with the original tab, your balancer is marked to line up with that.

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Old 05-25-2010, 09:55 PM
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set engine to TDC of #1 compression stroke

with old style tire iron or very large flat screw driver or an old distributor with the drive gear removed(easy to make one of these real quick) set the slot that is in the top of the oil pump drive shaft so that it points at front drivers side, and rear pass side of engine corners..

get ready to drop in the distrib so that the distirb rotor is pointing towards driv side front corner of engine but rotate it counter clockwise a few teeth or so..

drop it carefully in wiggle, wiggle the rotor or distrib housing til it falls all the way in and down onto the intake distrib gasket seal ledge of the distrib hole.

now youre super close to #1 TDC of compr stroke and timed right close

second tower clockwise of the thing where wiring for BATT and TACH plug in on the cap is the #1tower, originally, OEM
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Old 05-26-2010, 09:49 AM
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Thanks, I do have the distributor in though and it is running, I just want to check the timing and wasn't sure of where it should be. The post above suggests 0 degrees on his 305, but everyone keeps saying between 8 and 12 degrees at idle. So just wondering where my 86 350 should be set. Thanks again!
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Old 05-26-2010, 10:30 AM
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Quote:
Originally Posted by guysnydr
Thanks, I do have the distributor in though and it is running, I just want to check the timing and wasn't sure of where it should be. The post above suggests 0 degrees on his 305, but everyone keeps saying between 8 and 12 degrees at idle. So just wondering where my 86 350 should be set. Thanks again!
Set your timing where it runs the best...that will be somewhere between 8-12 degrees initial. It would be a good idea to check your total timing also. 36-38 degrees total should be sufficient. If you can't check the total then after setting the initial timing, hook the vacuum canister to full manifold vacuum and drive it and see if it pings. If it does then back it off a couple of degrees and try it again.
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Old 05-26-2010, 12:27 PM
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Thanks, if memory serves me right counter clockwise is retard and clockwise is advancing it right?
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Old 05-26-2010, 01:21 PM
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Quote:
Originally Posted by guysnydr
Thanks, if memory serves me right counter clockwise is retard and clockwise is advancing it right?
This is bass-akwards if it is a SBC.
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Old 05-26-2010, 01:32 PM
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You might be confusing the rotation of the distributor's rotor- THAT is CW, so rotating the distributor body CCW will advance the spark and vise versa.

As for the stock timing recommendation of 0º @ 500 RPM, this was the OEM timing given for a bone stock engine that needed to comply w/emissions testing. It is not a good starting point for a performance engine- just like using ported vacuum for the vacuum advance usually isn't the ticket for a performance engine.

If you find the post I made in one of the other threads you have open, it goes into enough detail to either get you dialed in or quite confused, depending on where you're at, experience-wise.

If the info in that post seems murky at first, go over it again- it may sink in. Or do a search here or google for "timing a small block Chevy", or something along those lines, there are hundreds of sites/threads/posts on the subject that might be better understood than my posts.

G/L
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Old 05-27-2010, 07:51 AM
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For your stock smog engine with computer controlled ignition, you should follow the instructions that are listed in the photo that MALC provided above and reposted below. Click for a larger view.

Take special note that the 0 degree timing is set at 500 RPM with the trans in DRIVE.

For better performance and an increase in emissions, the timing can be increased. Follow the same instructions on the label except for where you set the timing.
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Old 05-27-2010, 08:26 AM
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Just for clarification, the OEM specs on a federal emissions 350 car in 1986 was 6º BTDC. The sticker shown is for a CA emissions compliant 305.

Whether or not the rest of the tune up/adjustment info and procedures contained on the sticker is correct for a 1986 PA car w/a 350, I do not know.
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