I'm new to this forum but a guy on another forum recommended this one to me I'm wanting to build a ls stroker for my new mud race/dirt drag race jeep it all fiberglass and the last owner had a iron block alum head 351w it wieght 2800 lbs I'm looking to lighten it up with a lighter ls motor looking to build a 400 + ci motor around 13 to 1 compression carbed running on e85 naturally aspirated and would like to make 550+hp my problem is figuring out what motor to start with I live in south ga not many places around to find good donor engines that are reasonably priced not wanting to spend a fortune would like to find a 6.2 alum block but no luck yet if I have to build a 5.3 block what ci is it good for whats the best budget head to use any and all help appreciated

 

Start with at least a 6.0 block if your looking for 400+ ci. You can easily meet your power goals with stock l92 heads and intake with a mild cam. Especially with a high compression ratio.

 

If you want 400+ cubes you are going to need at least a 6.0 block. If you are trying to save weight try and go with the aluminum block since that will save you about 80lbs right off the top, trouble is those are going to be much more epensive. You could find a LQ4 6.0 iron block cheaper and build it to handle anything NA. Are you for sure you want to do carb instead of efi? Is this going to be street driven at all? If not, and you are for sure running e85, why not do 14:1 compression on a typical 408 build (4" stroke, 4.03" bore) with a big nasty cam and good intake. Its a very common combo, and will make a lot of power.

To go bigger cubes you are going to need to start with a LSX or RHS (or other) block and have it machine, but you will the cost of the iron 408 build just in the new block if you go that route...

Welcome to the forum

 

Thanks for the help this will never see the street would rather get more power and cubes just trying to get best bang for the buck what engines come with l 92 heads I would love to build a 427 or 434 ci but can't find a reasonably priced base engine to use around here don't want to spend 6000+ & then spend several thousands more building it the more power the better but must be n/a to run the class I run what ci is a 6.2 good for

 

415 stock bore and 4" stroke.
I'm not sure what the max bore with the stock liners is rated to.

 

I'm also wanting something capable of 7000 rpm stall speed can be whatever it needs to be will be leaving off a tranny break

 

What is your budget if you don't mind me asking?

 

what ever it has to be but i would like to be in the 5-6k range would like to use as many factory parts as i can and still make good power it will be what it will be i guess not for sure right now what i want to build just trying to figure out what is realistic power and ci numbers and cost to deteremine what i want to build for sure would like atleast a 402 or 408

 

New LS2 blocks are around $1k

 

a 427 is a 4.125" x 4" and a stock 6.0 may not be super stable at that bore. You'd need the machine shop to check out the block for you (added expense). A 4.03" x4" is easily doable in the stock block and leaves you some room to clean up the bore down the road.

To do a 427 with room to grow, you need one of the blocks Atomic mentioned above -- I used an LSX to build my 427 and couldn't be happier with it.

I can tell you that a 408 will make monster torque and can easily make your power goals NA. It will be cheaper as well.