What determines the redline? I have an 87 Iroc 350. Redline is 5500. What pieces do I replace to raise it?

 

i think vavle float starts coming along around 6 grand.

tpi seems to die off around 4,800 so u might need to look into like bigger runners, ported plenum things like that.

 

So you are saying that the stock engine won't turn up far enough to need better valvetrain parts.

 

Right. A stock Lb9 or L98 doesn't have to be revved past 5,000 really.

 

If I port it out, what will i need to change to keep it together?

 

What exactly are you looking to do? Do you want to make more power or just rev the engine for the sake of revving it? Virtually everything on the stock engine limits the rpm, the L98 wasnt designed to make power above 4500rpm. It is generally agreed that a well-maintained, low mileage bottom end will take 6000-6500rpm, but you have tiny little intake ports, 22in of intake runner, and a very mild stock cam, not to mention the stock "valvesprings" that the factory installs. If you want to make major power, get aftermarket/ported heads, a SuperRam/HSR/Miniram, headers, full roller valvetrain, a cam to match, and a bunch of tuning. If you just want to impress your friends with your high redline, get a V6 tach.

 

To hell with my friends. I want to get as much out of the tpi as i can.

 

question. Will stroking to 383 add torque and take away top end?