Switching from Volvo TBI to Carb on a 1996 5.7 GI

[alldodge]

Perfect
You just saved me $400
Do I need to change anything on it for the carb conversion?
I will put a new coil on. The old one looks tired.

Thanks

As Scott said coil is fine

Timing is done as follows the difference will be DO NOT use timing listed (2*), you will need to use most likely 8* BTDC. You also do not have a shift interrupter

 

[camboat]

Yes that's a EST, just use it

Will it work without the ECM?

 

[Scott Danforth]

Yes

 

[Scott06]

Will it work without the ECM?

The ignition module on a EST is in the distributor. Est is often used for points replacement or to replace NLA merc thunderbolt systems when the module dies.

 

[Lou C]

I thought of replacing my old Prestolite Points distributor with an EST, the only thing holding me back is the advance curve, I know the 4.3 cannot take as much advance as the V8s can, so I guess I'd have to set the timing by using Total Timing Advance, and then the idle timing will be whatever it winds up at, probably somewhat retarded from the stock setting.
Thoughts? The 4.3 according to my OMC Shop Manual gets only 12* of centrifugal advance, standard curb idle timing is 6* and so the total is only 18* @ 3200 rpm (with 89 octane fuel).
That's how I have run it all these years. Don't mind replacing points, but it would be nice to have something a bit more reliable.

 

[Scott Danforth]

The EST for the V6 has 2 different curves and the cylinder head determines the curve

 

[camboat]

The EST for the V6 has 2 different curves and the cylinder head determines the curve

View attachment 413989

Thanks

 

[camboat]

Thanks

Will I had time to pull the VST off the boat and I opened up the distributor cap and here is the model of distributor that is on the Volvo 5.7.
Sierra 18-5484-1

They must of put a new one on when they rebuilt the engine. I looked it up and it needs a control module to make it work. Is that right?

Thanks

 

[alldodge]

Just like the Davis one, the EST is self contained and only needs what is in the distributor to run. While Sierra is ok, the standard automotive GM is the same, nothing special