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A timing question

2.4K views 11 replies 7 participants last post by  dave ray  
#1 ·
I wanted to post a question on timing and hear the response. A month or so ago, I had to change out my MSD distributor, a mechanical advance with the 18 degree stop and the light blue and light silver springs. It was worn out. I replaced it with a new MSD distributor, a mechanical advance, with the 18 degree stop and two light silver springs.

Since making the changes, the motor seems to run differently. Now, with that being said, I did back the timing down from 18 to 16 initial, at the advice of the person that built the motor with me. So, presently, it is 16 initial and 34 total, all in by around 1300 rpm now.

This is my setup:

406
Eagle crank
6 inch forged rods
Stepped icon forged pistons
All internally balanced
AFR 195 heads
Lunati Voodoo hydraulic cam , 276 cam, 233/241, 504/525
Air gap intake
Speed Demon 750 w/annular boosters
Dynatec stepped headers 1.78 to 1.58
MSD 8551 mechanical distributor w/18 bushing, light silver springs
MSD 6 al box

Should be running about 10.4 compression
Backed by a dual friction clutch/TKO 500/12 bolt 3.55 rear

On the top end, it just seems to run out of juice a little and also seems to have picked up a little vibration.

So, if this were your setup, what would you set your timing at?

Thanks,

Rick
duskblue69
 
#4 ·
It was running pretty well until I changed the intake gaskets and that's when I noticed the weights on the distributor had some rust on the posts. It had gotten hard to start and I thought it was a starter issue. It turns out that the weights wouldn't return back to the center post so when I was cranking the car, it had the full advance in, both initial and mechanical.

Oddly enough, for the past few years, the car wouldn't return to idle, 750, unless I blipped throttle. It would hang out at around 1100 rpm. And it did that with two different carbs. Well, by changing the distributor, that problem went away. It returns to 750 rpm every time.

I live close to Road Atlanta and there is a place that has a chassi dyno, which I used before. Maybe I'll just schedule an appointment with them and make the timing changes and see the dyno results. It could be that I just need to get used to a distributor that is working properly now. I was just curious to see the responses. Some folks say 34 total timing, others 36 and 38.

Thanks,

Rick
 
#5 ·
Sbc was always 34, BBC was 36. The only way to know is run it down the track and check the mph.

I run 40 on the street and 44 at the track. Get all of the timing in as soon as the motor will respond without detonation. 2,500-3,000 is good, make sure nothing starts until a few hundred rpm above your idle in gear.the mr gasket #247 or 249 spring kit is what you want, put in one gold and one silver.
 
#10 ·
Why do you keep on ignoring the fact that numerous people have advised you that your curve is too aggressive and all your timing is coming in way too soon?
 
#11 ·
Maybe you should go back and re-read my posts. I haven't ignored anyone. I just asked for advice. And I am thankful for the ones that have offered it.