Shifting points
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Freshman User
Joined: Jun 2006
Posts: 29
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Shifting points
I Have a 77 F250 with a 351m. Just rebuilt the motor and put on a new 4 bbl carb. The 351m is happier now! but at what speeds should it shift at WOT? What speed should be the max that you could go in first and second? I don't have a tach yet and i don't want to blow the new motor.
Senior User
Joined: Mar 2007
Posts: 458
Likes: 1
It all depends on your setup. I just installed the TCI streetfighter valve body in my c6 and in D it shifts 1-2 at 5500 rpm
But my motor has a few non-stock goodies also, a stock motor wouldnt like that very much.
depends on your gear ratio for what speed it will shift also. pretty much i think we need more info to give you a good answer.
But my motor has a few non-stock goodies also, a stock motor wouldnt like that very much. depends on your gear ratio for what speed it will shift also. pretty much i think we need more info to give you a good answer.
Lead Driver
Joined: Jun 2006
Posts: 5,680
Likes: 1,001
From: Near Yosemite CA
#1, BUY a tach!! And yes it depends on your gear ratio, and tranny, since you are shifting, I am guessing it is a 4 speed?! I usually run mine up to about 35-4000, course when I get down to hwy 41 and head to town, it is straight up hill from a stop, so I tend to wind em up pretty good, I have gone over 4000 on accident (was still trying to shuffle coffee from hand to hand) but he didn't like it much...
Laughing Gas
Joined: Jan 2007
Posts: 868
Likes: 2
about 5k. All that will really happen if you over rev is you'll bend the pushrods and float out the valves.
put in new pushrods in a few minutes and hit the key again.
if you got bad bearings/it's gonna go eventually anyways.
put in new pushrods in a few minutes and hit the key again.
if you got bad bearings/it's gonna go eventually anyways.
