cam is 488 lift
comp ratio is 8.3
not sure on the jet but the shooter are 35
pro comp dist
dont know the pulley ratio
autolite 3924 gapped to 40 thous
its a brand new engine i built on an engine stand so i just assume the timing tab is correct
the car seem to idle better when i advance it but only to and optimum amount of timing i do have lighter than stock springs in the dist currently
Originally Posted by F-BIRD'88
Its pretty easy to do and there are more than one ways to do it.
But first lets see if this is what you need to do.
Every setup and circumstance is a bit different.
What are the details of your motor and car and what are you using for timing now? What improvment are you looking for?
Camshaft? compression ratio? carb jetting? shooter sizes.
What distributor make model?
Blower pulley drive ratio? What spark plugs?
Did you check and verify the timing tab pointer accurately indicates true TDC using a piston stop?
If you do lock out the mechanical advance curve, you will want to install a dash mounted ignition power cut off switch to aid hot cranking/starting the engine. Takes the heavy load off the starter mtor on a hot start with full timing. Its easy to do also.
Be sure you have the OEM rear starter motor mounting/support brace/bracket installed on your GM starter motor. If yours is missing go to the GM dealer and get one and install it.
Search my old posts using suitable keywords search terms for the how to's on locking out a HEI distributor.
Most of the aftermarket distributors with the weights on top under the rotor can be done the same simple quick easily reversable way I do it. Many/most others show how to lock out the mechanical advance in the instruction sheet.
Not hard to do.
You can download the instruction sheet for your aftermarket distributor from Summit Racing . com.
It would be nice to also add/reinstall a vacuum advance to your distributor and dial it in correctly to fine tune the overall ignition advance system for your blower motor. It will need specific custom calibration setup also but really helps the overall setup. The stock advance can off a stock distributor will not do. You need an adjustable type.