Holley Tuning Help

Walker434 said

Bob, I will try this test to see if I can cure the bog issue. Cracked, I was reading about these 10* and 14* bushings on another thread. Be easy on me as I am new to this but would these replace the black bushing I have in the distributor now?

Is my current black bushing limiting me to 18* mechanical or advanced? I understand that I need to get the timing where the car wants it before I worry too much about tuning the carb. I guess I just don't understand exactly what the 10* and 14* bushing do, but if these will make my car run better you can bet your *** I will be buying them from you!!!

Thanks for all the help!

Click to expand...

Yes, they replace the black bushing which is ~18* mechanical.

The bushing limits mechanical advance. Basic timing is two pieces, initial + mechanical = total

The bushing allow you to run more initial timing while not exceeding you total number.

Bump up the initial timing to find the highest vacuum reading you can get at the same base RPM. As long as it starts OK with out killing the starter, you're good. Set it to the highest initial timing point of starter kickback or vacuum reading whichever is lower. I'd expect that engine to run at 850-900 rpm without issue in park and 750-800 in gear.

Once you get the two pieces of timing, initial and mechanical figured out, you can mess with the springs. Usually the light silver and blue springs work really well on most cars.