Re: making changes
First, let's understand what you are trying to do. You indicate you want to remove your current 346ci LS1 engine, and replace it with a larger engine. Do you want to stroke your current engine to increase displacement, or do you want to consider another block in the LS-family of engines? There are cast iron truck engines that are routinely used, and the various LS2, LS3, LS6, etc. engines that can be used as a base for the build. There is even an LSx aftermarket block that allows huge displacment.
What is your goal - more HP? Just going with a larger displacement does not necessarily increase power a lot. How much the displacement increases HP and where peak torque occurs, will depend largely on the heads and cam selection. The cam selection and the quality of the "tune" will determine "how streetable" the engine will be. A larger displacement engine will generally be more streetable with a larger cam than the smaller displacement.
What are your goals? Without that info, it's really not possible to answer your question in any more detail than has already been offered above.
94 Formula A3+1: 381ci all-forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / Comp Cams custom solid roller / TH400+GearVendors OD/4.11's / Strange 12-bolt / 300-shot N2O / Spohn Suspension / 6-pt roll bar with integrated SFC's / full AutoMeter instrumentation / MoTeC M48 Pro engine management system / a few other odds 'n ends. 800HP/800LB-FT at the flywheel.
Last edited by Injuneer; 12-26-2013 at 11:55 AM.