Performance Forums > V6 or Straight 6 Engines

Engine part No's for 251 cu in Chrysler

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Averyman:
It is possible that the weights in the advance mechanism in the distributor are stuck but I would'nt bet on it.  If it runs fine in 1st and 2nd and you're in deep snow those engines just don't have the power to run in high gear. Mine won't either after our last big snowfall. Try it out on an old well packed track and see if it will run up to 50 mph in 3rd there. If it will theres likely not much wrong with the motor. If it won't then you have a problem.  I don't have a motor manual but am looking for one and will post specs if I do find one. Only rated at 115 hp, thats why others are trying to shoehorn V-8's into them..........

Cranman:
A good tune up sometimes makes a lot of difference in the power of these old girls. They have fairly good torque at low RPM for their horsepower. I'd get all the tune up parts from NAPA as per the part numbers posted earlier in this thread and a new set of Champion J-8 plugs. In GENERAL ELECTRICAL I gave my version of the tune up procedure which is fairly straight forward on these.
If your timing is too retarded you lose a lot of power and your exhaust manifold will be very hot. I've seen them cherry red at night. The rotation of your rotor should be clockwise as you look at it. So go anticlock to advance and more clockwise to retard. In heavy snow with mine I keep it so I can just hear some pinging from the engine as I push the accelerator down for more power. Too much advance is hard on valves. Not enough makles her a gutless gas guzzler. Hope this helps.

rackaholic:
Is there a automatic tranny that will bolt up to the 251? Also where might I find the serial numbers on the motor?We are still trying to figure what year it is.We are thinking it is the longblock 6cylinder.

rackaholic:
I have looked at some old chilton manuals and they show a vacum advance on the distibuter (flathead 6 cyl) and there isn't one on this motor I was wondering if anyone else has vacum advance on thier motor and if so why would they have removed this ???Don't you need the advance to give the motor more power when it's under load?I'm grateful for all the help! I figure the only stupid question is one that's not asked.

Averyman:
I believe the Chrysler Industrials never had a vacuum advance as they were designed for a steady load at rated RPM as used in tractors, combines, etc. Your Chilton manual will be for automotive applications. The timing could be different for the automotive and industrial version and just may be at the root of your problem if set to auto specs.... I'm not sure on this..... I see no reason why an automotive distributor with vacuum advance couldn't be swapped in to replace the origional.   Maybe we are on to something here ! Anyone else have ideas on distributor swapping for better performance ?
Clarence

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