make more sense to turbo the 5.3 instead of trying to build stroker out of 3.78 bore. will need alot of prep/machine work just to get to 3.905 bore.
ive built 5.3-5.7 this before, will never do it again. will just go with 6.0 based engines for large ci
if dead set on stroker just find a 6.0 and the same stroker parts will yield all the way up to 415ci (rounded off) with .060 0ver bore 6.0 and 4in stroke crank

 

thanks guys for ur input i have to admit 6.0 sounds cheaper in some ways lol guess i'll stick to rebuilding the tranny for now and think a little further about wat i want and save sum $$$$$ lol i'm looking for something fairly reliable around the 550 horse range thats y i'm a little nervous about high compression i guess forced induction would cost close to the same as a stroker kit

 

Welcome to the site, a lot of good guys and info here Remember, it's the dynamic compression ratio (DCR) that really counts, don't get hung up on static compression ratios (SCR). The advertised numbers that you usually see such as the 11:1 that you mentioned are the SCR...as cam overlap and valve events are factored in, the DCR will decrease, as will your chance of detonation. Here's one of the DCR calculators that I've used in the past that I found on google by typing in "dynamic compression ratio calculator": http://www.wallaceracing.com/dynamic-cr.php

Here's another good read that I found while googling "dynamic compression ratio": http://www.empirenet.com/pkelley2/DynamicCR.html

If you decide to stick to the plan of a NA stoker, I like this suggestion the best I myself am putting together a low mile LQ9 6.0 though, as the 6.0's are excellent engines and the lower compression dished piston LQ4's are plentiful and relatively inexpensive...then if you throw a huffer or a turbo on it, you can really tear up the pavement...and your wallet

Good luck with whatever you choose!