i know that i'd need low compression JE pistons, 4340 crank & rods. but could a studded 4 bolt block stand 10-12 lbs. of boost & a 250 shot?

 

LT1 blocks have held up to over 1000rwhp. You wont be at 1000rwhp with what you listed.

 

If a search were conducted, one might get 15-20 legitimate hits.

 

what kind of block prep did these big horsepower guys do to their blocks?

 

check my sig it tells abotut he block some

brook

 

You will get all kinds of conflicting info if you really look into it. George Baxter's 1000+ HP LT1 had "conventional" [non-splayed outer bolt] 4 bolt main caps and no block filler. And his engine held together fine. My LT1 block for my Dominion project has 4 bolt splayed caps, a main stud girdle, and I'm going to do a partial fill. So, compared to George's block, mine is pretty over the top! I just hope mine will hold together as well as George's!

 

I don't know if it is as simple as that, because I think the type of power adder also matters. Turbo setups seem to hold together better , especially compared to nitrous setups which seem to shock the components more.

If you look at most of the bigger power stock block lt1 and ls1 cars they are turbocharged, and even some of the turbo mustang and fbody cars that make big power use eagle rods that are rated for far less power than they are holding up to. The turbo setups seem to shock the engine block, and parts less, even though often times they make ALOT more power and torque. Look at the green Lt1 firebird that has i think over 1200 at the wheels. That's probably over 1400 on an engine dyno. That's only one car , but I don't know if a nitrous motor withe the power of many of the more powereful stock block setups would last as long.

The turbo setups also don't need as much rpm which kills parts quicker.

Im NOT saying his setup won't hold! It might handle it without issue. A 250 shot is not HUGE . It is on top of boost, but is not like a 450 shot, so who knows unless they have done it before.

But........ What I am saying is that from what I see , and people that know alot more than me seem to also say. is that I don't think it's just a matter of xxx amount of power. (Example: A 1200 hp turbo motor may last longer than an 1100 hp nitrous motor with the same parts.)

 

There are nitroused LT1 cars making a ton of power and holding up just fine. Plenty are running a shot on top of boost.

 

I find it interesting that so many people wonder about the strength of the Gen II block, when it's for all practical purposes the same thing as the Gen I block.

 

There may be. Depending on what a ton of power is . Im not saying they won't hold power. We have seen lt1 blocks take alot of power. (although i don't think i have see a 1400 hp nitrous lt1.) But that does not mean it won't hold the power. It may very well.


I'm not saying it won't. Basically what I am saying is that It does not seem to be as simple as..... There are lt1's holding xxxx rwhp and your combo won't be making that much.

 

Ive seen a local shop with a 1000HP 4 bolt, dunno how long it held up, but i would say 1000HP is the crown point.

 

Quite a few lt's have been making more than 1000 hp for awhile. I think they are mostly turbo cars though, but even blower and probably nitrous ones also. The turbo cars that I know of are still holding together. I have not heard anything about the others.

 

if my calculations are correct, if i run 575rwhp it will be a mid 10 second 1/4 mile car on boost. and then with spray, it should be a 5 second 1/8 mile setup. i'm coming up with that i need 850rwhp to do this, is that right? is anyone running these times with a m6?

 

Takes a lot more than just power to get there. Takes a hell of well set up car and a good driver as well.

 

Yes, absolutely.

This whole discussion is a little off the mark. when you talk about the block "holding" xxxxhp you have to specify "for how long"". We are making an assumption here, which is probably correct, about how the motor will be used. Most people here have street or street/strip cars that see peak hp/peak revs infrequently. In that case, sure, a properly prepared production small block can be used effectively. But if you take it out to the strip every week and put five or six passes on it and then sitck your foot in it and leave it there for 20-30 seconds at a time on the highway, and so on, don't expect to get 100,000+ miles on it like an OEM setup.

Rich