timing 400m
New User
Joined: Nov 1999
Posts: 21
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timing 400m
I have a 400M extensive rebuild of heads alum. intake 4bb carb 600cfm new timming set plugs wires whole set of engine gaskets headers, dual exaust and everything I can think of.
Can you folks tell me what you think the timming should be. I set it for 6btdc. Is this too conservitive... I have had it as high as 14 .... Oh yah, I MSD 6a and new msd distrib. sparkplug gad is .50 seems much smother than when it was .42
Thank you : Justin
Can you folks tell me what you think the timming should be. I set it for 6btdc. Is this too conservitive... I have had it as high as 14 .... Oh yah, I MSD 6a and new msd distrib. sparkplug gad is .50 seems much smother than when it was .42
Thank you : Justin
Fleet Mechanic
Joined: Nov 1999
Posts: 1,415
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From: Lower 48
timing 400m
I've got a '78 351M that I have never been able to get the thing to run at 'specs' without pinging under all conditions except idle. The only way I could time mine was to get it running, tie it to something solid with a chain and back off the timing as I accelerated it in gear. I've been told since then that timing was always a problem on the M's - could be wrong, but that's how I took care of mine.
Trail Rider
Trail Rider
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Posts: n/a
timing 400m
>I've got a '78 351M that I
>have never been able to get
>the thing to run at 'specs'
>without pinging under all conditions except
>idle. The only way I could
>time mine was to get it
>running, tie it to something solid
>with a chain and back off
>the timing as I accelerated it
>in gear. I've been told since
>then that timing was always a
>problem on the M's - could
>be wrong, but that's how I
>took care of mine.
>Trail Rider
Don;t we think this method to be a little risky. I don;t think I have the -----, will to tryit this way. P.S I live in LA... any sug. on just a preset timing location. 6-8btdc. thank you for your mesage though very fun to read.
>have never been able to get
>the thing to run at 'specs'
>without pinging under all conditions except
>idle. The only way I could
>time mine was to get it
>running, tie it to something solid
>with a chain and back off
>the timing as I accelerated it
>in gear. I've been told since
>then that timing was always a
>problem on the M's - could
>be wrong, but that's how I
>took care of mine.
>Trail Rider
Don;t we think this method to be a little risky. I don;t think I have the -----, will to tryit this way. P.S I live in LA... any sug. on just a preset timing location. 6-8btdc. thank you for your mesage though very fun to read.
Freshman User
Joined: Oct 1999
Posts: 45
Likes: 0
timing 400m
on my stock 400m in a 78 4x4 is 12 degress BTDC. that is on the stat sticker on the valve cover. I know the truck was built in Cal. and was driven in that state for many years. Truck had a 5th wheel hitch the next owner used if for bedcamper. The truck has been in So. Dak. for almost 10yrs. Still has plenty of power and know pinging w/ that setting. Hope this info helps get you a starting point.
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