i just finished putting my new motor in and i cant get it to run right.its a gm caprice long block i changed the cam and added slp headers and a hypertech fan switch otherwise its stock. here are my problems. I cant get the timing right. to use the motor i had to change the timing cover and balancer off my origanal motor. the timing marks were located differantly. it wants to run at 12 degrees before top dead center on the timing mark anything more and it starts to run rough and back fire. and i cant turn the distributer much past that. the other problem is that the temp guage keeps jumping fromm 100 to 260 any clues.

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91 Z28 slp headers adj reg accell cap rotor coil comp cam roller
random tech cats flowmaster catback
new motor in

 

Red,

First, the easier one. The temperature gauge is probably "jumping" because the wiring to the sesing unit is intermittently grounding somewhere. Grounding the wire will cause the gauge to read full scale. The grounding could be the sensing unit itself, or could be between the gauge and sensing unit.

As for the timing, you'll need to verify that the TDC mark on the balancer is actually TDC. The best way to do this is with a piston stop and degree wheel. Once the marks are correct, if the distributor will not turn far enough to allow adjustment because of interference with other components, you can lift the distributor and move the driven gear one tooth at a time in relation to the cam gear to obtain adequate movement in the direction you need.

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Later,
Vader
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"Let the bodies hit the floor!"
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