i was wandering who is turning the most rpms on there stock botttom end and how many miles it has on it. i very rarley spin past 5500 due to blowing 2 alternators at higher rpm.

 

I spin to around 6400 with no problems, ive heard of people going as high as 6800

 

6800 damn thats a lot. too much for my broke a$$

 

I would also like to know. Heads and cam, i don't see it safe to spin it past 6200. But can anyone prove me wrong (i hope so ).

 

ne1 else

 

The real limit is the pcm can't control spark past around 7000rpms, the rotating assembly will take that.

 

I've gone until the PCM shut off, almost 7300

-Shannon

 

But for how long have you guys done this? Its hard to belive that you can spin the stock assembly that high every time you make a pass down the track. I'm not saying you can't do it. I'm saying what is hmmmm "safe" and will get my many passes out of the car. I'm sure i could spin it to 7300, but a few times with that and i'm bound to **** up a bearing or throw a rod. Don't ya think?

 

thats nuts i can't believe it held up.

 

no one else with alternator trouble?

 

Had it at 7000 one night after i got it back from PCMforless, didnt know he removed the rev limiter. Other then that not above 6500, the limit i set with the MSD.

 

Everytime it hit the track for a year. The valve springs comp cams kept sending me would not work at that rpm (even though they said so) and eventually took out a piston by dropping a valve. I may want to add that this was a stock parts bottom end. Studs were used and everything was balanced properly.

-Shannon

 

The LT1 is a very well put together motor, people do not give it enough credit they are stuck thinking about the crap GM built in the 70s and 80s. There are a COUPLE b-bodies running boost plus spray on stock rods/crank, one with stock pistons too the other with forged, granted I am sure those setups do not run over 6500 but it still makes a point about the unexpected strength of our stock components. The one car dynoed around 630hp/690tq to the wheels with 14psi and a rich 100shot

 

spin my heads and cam car to 6800

 

GM847 here on stock heads - I shift at 6500. I MIGHT take it to 6800 once, I need to get my tach calibrated a bit better to see if it makes a difference at the track.