I have replaced the head gasket on my 1990 350SDL W/ 603 motor. All went well until I started it up. It runs rough with a lot of white smoke from exhaust. I thought a possible injector problem and cracked loose the lines to each injector and number one cylinder made no difference. I switched the number four and number one injector to see if the problem moved and it did not. I am beginning to think that I got the I.P out of time when R&R the head although I tried to keep tension on the chain. I have searched the forum at length and have read alot about the I.P and how to set the timing on 240 & 300 turbos but not alot on the 603 motors. Is the timing on this motor at 24 BTDC also as a starting point? I really dont want to remove the pump maybe someone has a idea to share. I did try to adjust the I.P as much as it will allow both ways but seemed to make it worse moving towards the motor and no difference away from the motor. Thanks for any help you all can provide.

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Who needs spark plugs.