N2OBaby

I hear the LQ4/9 engines are the prefered blocks for FI but could a 396(4.071 bore w/ a 3.8 stroke crank) or 406 cid(4.071 bore w/ a 3.9 stroke crank) LS3 stroker survive a F1-A or a cogged F1-R Procharger?

I am asking about a stock block not a resleeved and gusseted block.

speedshifter

iTrader: (1)

curious about this myself, planning on doing a build with a L92 engine (believe the block is pretty much the same as an LS3) and boost. Would like to bore it out and go with a deeper skirt piston if possible without sacrificing reliability.

N2OBaby

The reasons I was thinking LS3 is the bore 4.065(LS3) v.s the 4.005(LQ4/9) and the fact that a aluminum LS engine weighs 65-85 pounds less.

I hear 4.1 or 4.125 cranks are no good for the LS3 with FI.

speedshifter

iTrader: (1)

What about just the limit of boring over then? The stock crank is forged anyway. Boost can make up for the lack of cubes from a stroker crank. However, the pistons and rods have to go no matter what. I would love to use the LS9 pistons/rods, but way too much $$$.

N2OBaby

I hear an LS3's limit on overbore is 4.071(stock is 4.065) while the LQ4/9 is a +.060 overbore.

That is what I've read.

lt1773

iTrader: (1)

GM ls3 416ci motor will also perform but keep in mind the requirement of using big turbo 91mm and so

speedshifter

iTrader: (1)

who said anything about turbo? the OP asked about a cogged procharger.

to me if the 6.2L motors come with a 4.065" bore, or the LQ4/9 come with a 4.005" bore with max .060 over bore spec, you would spend the money to have it bored to 4.065 anyway and you are at its limit. Why not just use a factory bore LS3/L92 and use a stroker kit?

I'm still not answering your question about the reliability of stroked & FI LS3's, so im subscribing.