I have done a couple of these, both of which are still going strong. The LQ9 is plenty stout to handle those needs.
I usually have them prepped the way this one is. https://ls1tech.com/forums/parts-cla...boost-new.html
The 1/2" head studs help a bunch, the main dowels are very important. Keeping the bore the smallest you can will help in cylinder strength. A standard stroke would be a very reliable package with those twins, although a 4" crank will work too. Lots of piston strength in the stock stroke version and they are available off the shelf without custom ordering.
Originally Posted by Trav4011
Trying to decide on which route to take.. I don't know much about the iron blocks, so I figured I'd ask. Will the LQ4 block support around 1000whp through a TH400? I'll be running a pair of billet 67's (T4 based), and LS3 heads. Stock bore.. What would you guys recommend stroke-wise? I'd like to keep the compression height and rod/stroke reasonable, as I don't want to chew up pistons/rings. Also, should I machine for larger head bolts, or will stock diameter in a L19 alloy work? So, just a few questions before I get started.. Thanks for the help.