94 Northstar with broken valve.

[Zorb750]

How do you so horrendously overrev this engine? 6500 RPM = fuel cutoff on 1994.

[wpg-topsecret]

So, if I go pick this motor up and plan to use it, what is the MINIMUM work I should do the check/repair and make sure it's good to drive?

Pull heads, check combustion chambers ect (replace head gaskets)
Pull oil pan, plastigauge bearings, check for damage
Rebuild heads, replace lifters

Anything else I should check/rebuild?

[Odin8]

Eh, if something malfunctions in the PCM or EBTCM or whatever controls the rev limiter then I suppose you could over rev it then. My mechanic said I probably threw a rod from over revving it, and that was a result of my EBTCM malfunction. My traction light was on and after the car blew up they found the EBTCM to be shit, and when I was driving it before then it'd revved until I let off the gas, it wouldn't shift at redline. So /shrug, that is one explanation? If anyone knows better let me know, I'm still kind of skeptical myself. Otherwise yah, I'd ask the same question, how the hell could you over rev an engine like this with everything protecting it?

[zonie77]

Originally Posted by wpg-topsecret

So, if I go pick this motor up and plan to use it, what is the MINIMUM work I should do the check/repair and make sure it's good to drive?

Pull heads, check combustion chambers ect (replace head gaskets)
Pull oil pan, plastigauge bearings, check for damage
Rebuild heads, replace lifters

Anything else I should check/rebuild?

If you pull the caps you have to replace the bearings. I would do a cyl pressure test on it or do the HG's if you have access to a timesert kit. You might consider replacing the case seal too.

[Zorb750]

EBTCM has nothing to do with rev limiter. Your mechanic is an idiot.

[Odin8]

Pretty much what I thought. What would cause the rev limiter to stop working then?

[Zorb750]

Well, the Northstar doesn't use a phototachometer, so it can't be loss of tach input... It needs the crank signal to activate spark. PCM would be my assumption.