The relationship between the GM cap lock screws may help:
http://www.billhughes.com/temp/buickv6fire.jpg
God Bless America, Bill O|||||||O


bowgus wrote:
>
> Have that engine with Rochester 4bbl in the boat ,,, service bulletin
> says:
>
> 1. Rotate engine in normal direction of rotation until the timing mark
> on the crankshaft balancer lines up with "0" (TDC) on timing tab and
> engine is in #1 firing position.
> 2. Look closely at the cam in the distributor. Three lobes have sharper
> profile than the other three (sharp, round, sharp, round, ... 1 (132
> dgrees) 6 (108 degrees) 5 (132 degrees) ... and so on ... )
> 3. Install the distributor so that when the rotor is aligned with with
> the #1 spark plug tower, a rounded lobe is aligned with the rubbing
> block of the breaker points.
> 4. Secure distributor with clamp and check engine timing with timing
> light. For what it's worth I set my timing at 8 degrees and use Shell
> Silver 89 octane.