jdub38672

iTrader: (4)

Hey guys needing some help and wanting some opinions. Currently I have an Ls3 block and L92 Cnc'd heads. I also scored a low mileage complete lq4 motor. I would like to build a 427 using the aluminum block 4.070 bore with 4.100 stroke. Then sale the lq4. Or should I build the iron block. I'm leaning toward the aluminum block because its already going in a heavy 04 Gto. Just wanting some options and past experiences with these combos. I could back of cubic inch and build a 418 with either block. The lq4 is complete so I migh just leave that alone. Someone help lol!

S10xGN

iTrader: (11)

My whole passion in embracing these engines is the aluminum block, so there's my opinion...

jdub38672

iTrader: (4)

Thanks S10xGN I was thinking the exact same thing. Plus I believe these about a 100 lb. weight difference

Gunslinger09

If you have the block and heads already Ls3 definately.

Gray86hatch

iTrader: (83)

I would not go with more than 4" stroke

The stock bores are not long enough to support the piston at bdc with more than 4"

Tim

Jimbo1367

^ what greyhatch said. LS3 418

yonerhottlt1

iTrader: (21)

LS3 hands down...

Tainted

iTrader: (9)

Ls3 will have a bigger bore, a better block, longer sleeves and you would be crazy, oh and its 110lbs lighter

MertezWS6

iTrader: (8)

I got an LS3 block and in the process of doing a 418 build, so my vote's for the LS3 418