stock type timing curve 72 350
June 16th, 2017, 08:49 AM
#1
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Join Date: Apr 2012
Posts: 9
stock type timing curve 72 350
Hi Guys.
I want to check my timing curve. The engine's temp slowly rises at highway speeds to around 200 with 180 thermostat. So just to be sure I would like to know some basic, stock type specs.
1972 cutlass 350, 4 bbl, AC (not hookedup), highway RPM about 2000 at 60MPH (but the tires are not stock diameter)
Points distributor stock. I don't think the engine has any high compression or hot cam. I think I have initial timing around 7 degrees.
Edlebrock carb, may run a tad rich, but plugs are tan, so not too rich.
Ethanol fuels here.
Never heard any pinging.
So what do you suggest would be around stock?
Initial timing:
Vacuum timing:
Should vacuum be ported or full (ported now)
total mechanical timing by what RPM?
Any help is appreciated!
I want to check my timing curve. The engine's temp slowly rises at highway speeds to around 200 with 180 thermostat. So just to be sure I would like to know some basic, stock type specs.
1972 cutlass 350, 4 bbl, AC (not hookedup), highway RPM about 2000 at 60MPH (but the tires are not stock diameter)
Points distributor stock. I don't think the engine has any high compression or hot cam. I think I have initial timing around 7 degrees.
Edlebrock carb, may run a tad rich, but plugs are tan, so not too rich.
Ethanol fuels here.
Never heard any pinging.
So what do you suggest would be around stock?
Initial timing:
Vacuum timing:
Should vacuum be ported or full (ported now)
total mechanical timing by what RPM?
Any help is appreciated!
June 16th, 2017, 09:27 AM
#2
Administrator
Join Date: Oct 2009
Location: Poteau, Ok
Posts: 40,561
Your factory timing setting should be set to 12* at 1100 rpm with a 30* dwell and vacuum advance disconnected. After the timing is set the idle speed needs to be set to 600 RPM with the car in drive. What I would do is go back and verify these settings and readjust the idle air/fuel adjustment. With your timing light still connected check your vacuum advance operation by connecting it to manifold vacuum and see how much it advances. Once you get all that done let us know what settings you have set in the questions you posted above.
You should have a ported vacuum switch on your intake manifold that will switch from ported to manifold vacuum supplying your vacuum advance if the engine gets hot.
You should have a ported vacuum switch on your intake manifold that will switch from ported to manifold vacuum supplying your vacuum advance if the engine gets hot.
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