I am currently planning a build for my 2002 Z28. I am planning buying a stroker kit from Texas speed and already have some 243 heads. The heads are currently being ported and will be shaved.030 with 2.02 intake and 1.57 exh valves. The block will be bored.010. I plan on using the stock ls6 intake. All this in efforts to get as close as possible to 500 rwhp. I have a budget of around 3 to 4k. Could spend more if needed. My question is how close to the wanted 500 will I get and for the amount I'll be spending is there a better route? Any input is greatly appreciated. Thanks in advance.

 

Sell all that, and do a turbo 5.3 for near nothing after selling the LS motor? Then have the ability to easily top 500hp... Just a thought.

I built a car for a buddy, 406 stroker (weird I know but it was .020 over) PRC stage 2.5 heads, long tubes with a single 3" exhaust. It had a FAST 102 intake and throttle body. All that and all that money got him 497 rwhp. Personally i'd rather not spend that much to only make near 500. It could have made more power if it were a max effort thing, wasn't an auto with a big stall, or had better exhaust (maybe) and didn't have plugs in it for spray but that would cost even more.

And you plan to top yours off with an LS6 intake.. I'm guessing you may land in the 450 range. That intake would be just fine for turbo though. And you could also go without porting the heaads to save money and still make over 500 going turbo.

I assume you have an LS1 and that's why you said you'll bore it .010, but you can only bore them .005 from what I understand.

If you do have an LS1, you can sell it for a pretty penny and pay for the 5.3 motor and a decent amount of your turbo kit and not be out any money yet. Then use your budget for the rest of it and come out making plenty more than 500.

 

I would sell the LS1 and purchase and assembled 402/408ci engine. Whether or not you make 500hp is going to depend largely on how well the heads are ported and what kind of cam you plan to run, but with an extra 20-25ci, at least you'll have more torque to make it feel like makes 500hp.

 

Cheapest/safest way out is to put a mild turbo setup on the ls1.... otherwise it's tough making 500 rwhp with a stock cube ls1.

If you want to do it naturally aspirated and not worried about boost issues I would look into a 408ci shortblock. Then spend some nice coin on a nice set of heads. Not a LS3 head cause they seem to be below 500 rwhp in some cases even with 400 plus cubes.

Otherwise a correctly built 370 cube setup can get you 590 at crank easily.

 

My reading tells me that LS1 blocks through 98 can only handle +.005 however the 99+ should handle +.010. Right or wrong?

(Agreed 500RWHP in LS1 block is not cheap and rather at the upper limit)

 

I have an '01 M6


SDPC short block
MTI stage II heads
Fast intake
Long tubes
228R cam


Last dyno run was 470 at rear wheels.


Just to give you an idea...

 

Any track times ?

 

I'd suggest a mild HC build like AI porting the 243, a decent street cam like the titan 4 or HT street sweeper. That'll get you in 420 territory but still be streetable. Then a 100 shot of nitrous for when you need it. With your budget you're not in 500 hp NA territory at any displacement .

 

243's tend to not have enough CSA to properly feed a 4" stroke.. hog them out big and get an MSD intake, cam it for 7000+ rpm

 

No


Closest track is 2 hours away. Hopefully this summer I can get some times.


Thanks

 

 

So you made 470 with a atock cube LS1 with ported 243's? Am I reading that right?

 

If you keep the LS6 intake get TPIS or LPE to do the 90 mm snout mod for $350. The intake will pick up some flow and make more hp than a stock LS6 intake.

Like the others think you will need a bigger budget for 500 whp NA.
450 whp with good ported 243's, reasonable cam and supporting mod's should be very doable.
My 91 RS's 383 LS1 made 465 whp with hand finished TEA Stage 2.5 LS6 heads and a small 229/229 cam and LS6 90mm manifold, Headers etc. I expect the top end would make about the same on a stock cube LS1.

Or turbo 5.3 like previously mentioned.

 

 

 

Nope your not, he's correct. Supercharge that bitch.