I have a stock 90 HO block that current bored .030.

What is the theoretical limit of HP the block will take?

I know Wendy made 577 at the wheels on hers with a turbo. To the best of my knowledge,.. that would put a block on serious borrowed time. But since a turbo doesnt initially shock the block with that much power like say blasting it with a 300 shot of nitrous would,.. or a blower at 20 lbs of boost. A turbo motor should be able to hold more HP together,.. or is that just a myth?

Is it the RPM's or the initial torque shock to the block that splits them down the middle?

I was always under the impression that 600 at the crank,.. or 500 at the wheels was the limit.

I just picked up a NOS Cheater kit and want to use it. Naturally I want to make as much HP as I can,.. but I dont want to destroy the block either. How much would you guys spray on a 306 motor? Would a 200 shot be too much?

Actually I think I better explain in detail what I have,.. then you guys can give me a better assessment.

Its a stock 1990 HO block. bored .030, decked .020.
Stock crank and rods, shot peened.
Pistons are KB Silvolite series with a 20cc dome.
Compression should be in the 11:1 - 12:1 range. I do not know for sure or how to find out.
Heads are AFR 185 #1387 heads. They originally had 62cc chamber but have been milled and are now 59cc. They have nitrous exhaust ports.
cam is 'supposed' to be a Comp Cams NX274HR cam. .555/.570 with 224.236 duration. Website advertises it as a nitrous/blower cam with good NA power to match. Its rated 2500 - 6200 rpm. Crane 1.6 roller rocker that Shaun says are bad ass rockers. Heads have titanium retainers, valves are supposed to be the sodium filled ones with matching springs for the cam but with stock hydraulic roller lifters.
Intake is a Vic jr
Carb will be a Holley 650 HP
and will have a MSD billet distributor and MSD digital 6+ box by the time I get this all together.

Obviously with a stock crank, rods and hydraulic lifters I'm limited on the RPMs,.. and the cam is only rated to 6200 anyway.

The motor is making good power. I went 12.70@110. The mph is there,.. the ET's will come down as soon as I fix the rear and lighten up the car. There is also 20 - 40 more HP to be had with a better exhaust, the Digital 6 box and the HP carb. Judging from the MPH and a race weight of approx 3600 - 3700 lbs. The math indicates the motor is making at least 360 to the wheels right now. How accurate that is I am not too sure. But its making at least 340 for sure. With a 200 shot,.. that should put me close to 500 at the wheels. Will the block handle this,.. or should I be safe and stick with a 125 - 150 shot?

Thanks guys,

Hurst