Would pro mags, springs, and pushrods enable me to push my redline up a bit? If so, what RPM?

 

Probably not, but it would increase your power because of the increase lift, duration, and valvetrain control. You should probably have your rpm limit increased a bit so that you could get to the higher usable rpm. A mail order tune would be in order. JMHO.

 

i was told i could bump my shifting to 6k safely on a stock bottom end. So that's where my car's been shifting.

 

Peak power from a stock LT1 is 5000rpm.

If you go to a 1.6:1 rocker along with a better spring you may increase the usable powerband to some extent and make a little more power. A 1.5RR, however isn't going to net anything measureable.

-Scott.

 

Just the RR with the stock ratio will give you a LITTLE HP but you would no notice it. It will also rev better. Less friction more power.

 

My peak power is at 5900rpm, 1-2 shift @ 6000, 2-3 @ 58-5900. Switching from 1.6 Promags to 1.7 Scorpions netted me 10 rwhp & 6 lbft. Bone stock mine peaked @ 54-5500 rpm.

 

Yeah, I am going with the 1.6 pro mags. I know the power dies up at the top end anyway, I was just thinking that the top end of the motor was the limiting factor to rev's. If I remember right the LT4 redlined at 6400ish, and the only real engine difference was the top end.

 

guess valve float on lt1 was limit, not bottom end? If that's true I may move shift points to 6.2krpm. That reasonable on stock bottom?

 

When I was running 1.6 rockers and LT4 springs I had my fuel cut-off set at 6000 rpms. Now with heads/cam/4.10's the rev limit is set at 6700. I'm seeing 64-6500 rpms through the traps. This is with the stock short block.

 

Stock bottom end?

 

Respectfully, there is NO way, peak power can be raised 400RPM with a rocker change or the use of the items posted in you sig. You must have a NON stock cam if you truly are paking at 5900RPM.

OP. The use of higher ratio rocker will NOT let the motor rev any noticable amount higher. The torque usually goes up a bit and nets the small but worth it gains. The one thing that raises the peak power points the most is a higher duration cam followed by ported heads then better flowing exhaust.

 

I am fully aware of that. I was just curious if the top end of the motor was the limiting factor to the rev limit, and if so, what would be the new safe limit with a new topend.

 

The LT4 cam had more exhaust duration and a lower LSA. That and the top-end you mentioned allowed it to rev a bit higher. It wants to be shifted no higher than 6.2KRPM or so or it will quickly run out of breath just like the LT1. I have driven one and it hits the wall at 6KRPM just like the LT1 does at 5.6KRPM.

 

Expect no to very little chance of peak power moving to a higher RPM with a new topend. You can put it on a dyno to verify if you want.

 

With the upgrades you did to the valvetrain there should be no problem running to at least 6200 rpm. I did it for over 5 years, 100k miles, and roughly 200 passes at the strip on the stock valvetrain. Never had any problems with float. It didn't really do anything for me powerwise though. However, the biggest benefit of running that high in an M6 with stock 3.42's out back would be that you don't have to shift into 4th before going thru the traps. That alone netted me about 3 tenths at the strip.