[jmichaelre]

I finally have my engine running really decent. It's running best with 18 degrees initial. I'm running a MSD Street Fire Dist and I'm getting 21 degrees there. I'm all in at about 2900-3000 rpms. I realize that most threads I've seen on here have said you want to max out at 32-38, but its running good and not pinging with this initial timing. My question is should I throw in some different bushings to limit the distributors mechanical advance. By the way I have a limiter plate in the distributor capping the vacuum advance off at 8 degrees and its connected to full manifold vacuum.


355 SBC
FLAT TOPS
194 HD HEADS
EDEL 2101 DUAL PLANE INTAKE
EDEL 2102 CAM
HOLLEY 600CFM

Previous calculations put compression at around 8.9 to 9.1

[Frisco]

Originally Posted by jmichaelre

My question is should I throw in some different bushings to limit the distributors mechanical advance.

You can give that a try if you are experiencing any detonation. Actually, I think you've pretty much nailed your timing curve. The amount of vacuum advance is very good for your combo.

Setting the Total Mechanical timing in the 32-38 degree range is a guideline only. The lower number (32) is recommended for Vortec style heads. Every engine combo will run best at timing curves different from another similar combo. Getting the timing curve that works best for you is what should be the goal.

One way to check your timing curve is to actually take it to the track and compare MPH on different runs with different settings. You want the highest MPH to guide your timing changes.

Check your plugs for correct heat range as well.

[jmichaelre]

Thanks.....