Rev limit advice needed

[geoffinbc]

Yea the 2.8L pump is fine brand new. But as it ages it wears out prematurely. The aluminum body just wears faster than if it were cast iron. So keep an eye on oil pressure and temps and get use to how they correlate. If you ever notice a difference from the norm then take note. For instance if oil pressure is 15PSI at idle with oil temp at 215*F then thats great so make a mental note. If it drops to say 6PSI with everything else the same then you know something is up.

The vale train will not float if you used the correct springs for the cam you have. If your using old factory springs then I would never rev it that high. Also remember that boost effects the intake valve as it begins to close on the seat. So extra spring pressure needs to be added as boost increases.

[dskopek]

If you had the 3.1 crank turned down on the mains do you know if the lead in oil grooves were cut back in? I ran both 2.8's and 3.1's hard before and that was the fix for spinning rod bearings. If they are there it should live just fine at 6500 like betterthanyou posted.

[GM Ontairo]

yea the crank was sort of a last minute oh shit moment. We had all the machining done and everything was set up and ready for installation and we realized the 3.1 crank was different. So I had it custom ground. It's the stock 2.8 pump.
At 6500 I'll be pushing 6 lbs. My cooling system is above and beyond, griffin aluminum rad with dual electric fans. If I can spin it up to 6500 will I run into problems with the valve train potential float issues?

[geoffinbc]

6500 is fine especially if it is balanced. Did you have the 3.1L crank journals machined down to the small journal? Never see this done. I would not worry about the small main journal crank as long as your oil supply is good. Are you using a 2.8L aluminum pump or the 3.1L cast iron pump?

[GM Ontairo]

I've been searching and reading threads tirelessly for the last 2 hours and am still undecided as to what is a safe limit to set. So please feel free to chime in here for me.

My current set-up is

2.8 block, bored/stroked to 3.2
heads are off a 2.8fi Camaro
3/4 cam lifter kit
Index ground 3.1 Crank
Line bored crank internals
Blue printed
bored/honed to 40 thou over
9.5 compression

I've got an MSD 6AL2 and I currently have the rev limiter set at 4500. At 4500 the blower puts out 4lbs of boost. For every 500rpm upwards boost builds by .5

Prior to installing the MSD I could sping the motor up to 6500+ no problem. If I wasn't paying attention it would be there very quickly. I can't help but feel that is to much for what it is.

What can I safely spin this combination up to? The bottom end is stock, stock cast pistons and it's an '84 block with a small journal crank. Motor was completely gone through and rebuilt professionally less then 2500 miles ago. I like to road race with and it could potentially see the highest rpm for a 5 seconds or so at a time. So the rev limit* definitely needs to be safe.

Please input is appreciated.

Andrew