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#54328 01/02/2006 11:54 PM | Joined: May 2004 Posts: 12 New Guy | | New Guy Joined: May 2004 Posts: 12 | what is the timing on 250.i mean what is it supposed to be how many degrees btdc. and is it possible for the engine to run if it is 180 degrees out. i put in dizzy and it runs but it runs real rough and spits and sputters | | |
#54329 01/02/2006 11:58 PM | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | mborth,
It won't run 180 out! You can turn the distributor by hand as the truck runs. Turn it until it runs smoothly. I am not sure of the factory timing on a 250, but 4 degrees before should get you in the ballpark until you find something better.
Stuart | | |
#54330 01/03/2006 10:54 PM | Joined: Jul 2005 Posts: 5 Junior Member | | Junior Member Joined: Jul 2005 Posts: 5 | You may be off by one tooth. If it runs better when you turn the distributor housing one way or the other and you get to the point where you no longer can move the housing you need to carefully pull the distributor. Move the rotor/distributor shaft one tooth in the direction opposite of the direction you turned the housing and it should smooth out. This should get you close enough to set the timing. | | |
#54331 01/07/2006 11:26 PM | Joined: Dec 2005 Posts: 2 Junior Member | | Junior Member Joined: Dec 2005 Posts: 2 | I have a 71 250 here and the sticker on the radiator shell says 4 degrees before TDC at 500 rpm automatic (in drive) and same for stick at 550 rpm. Vacuum hoses removed from canister and carb and plugged. Spark plugs gapped at .035. That is what the factory sticker says.
Paul H
GMCPASO-71 GMC Stepside C1500, 1929 Ford Tudor.
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#54332 01/08/2006 5:11 PM | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | Check the fireing order . You might have crossed a plug wire. Pull a plug & see if it is all black with carbon. This gas we get now can carbon up plugs real easy if you idle a lot or run a little rich. Especially if it,s old gas.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
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