How far to push my stock block

[Alaskabuick]

I am running a untouched stock block with 50 k original miles, have owned the car for 14 years and put almost all the miles on it. I have progressed thru the years with the normal mods.

I am now running champion heads, GT35/61 turbo, 50 lb inj, headers, stretch IC, ported intake, on an on.....

I understand the turbo I have will make 670 hp. Injectors are maxed at supporting 600.

My question would be at what boost am I pushing the capabilities of the block? I am running a 22 degree chip and have a translator that I just installed. Have now messed with them timming, just left it at no change. I run 100 octane all the time.

I have ran up to 24 pounds of boost with no knock.

I would like to run as strong as possible while staying in the safe zone for my block.

I am just not sure where that is, I have dialed the boost to about 21 and left it their, 24 pounds is alot more fun.. But want to be safe.


Dennis

 

[Grumpy]

no knock no problem :biggrin: detonation is the killer

 

[Razor]

Times in sig were done on an OEM shortblock cept for 210/205 cam. Rest is stock.

Its a tough call.. everyone will say different things. And the more power you make.. the shorter the fuse.

As Grumpy said... knock will bring the house of cards down in quick fashion.

Case in point, a girdled shortblock is being assembled currently.. to keep things together, cuase as you said.. once you tasted 24.. you'll want 27.. then 30

 

[Ormand]

There seems to be a case for going to a girdle on the block somewhere around 600-650 hp. I'ts not like going over that will be instant death, but somewhere in that range the chances of driving over the crankshaft start to get higher, and the girdle is good insurance. Some folks have had problems at lower hp, though.. knock will kill the crank and bearings even at near stock hp, if it goes on long enough.

 

[GS70350]

With the mods you have i dont think you will have any issues with the short block as long as there is no knock occuring. You will find your maximum flow potential of your injectors in short order especially with those heads. I say you will run out of injector long before your engine will hit its stress limit, so turn it up.

 

[Ormand]

I say you will run out of injector long before your engine will hit its stress limit, so turn it up.

And the afterrmarket headers will help to hold down the horsepower/torque, too, so the block should be safe for a while.

 

[chris2316]

we have an 85 block car running a te-63 runnun mid tens no problem with 57# injectors no knock on race fuel 110 or higher!