silverbandit0996

iTrader: (2)

Ok heres the deal. im a collage student, so im not rich . Im getting an Lq9 so i can build me another motor for the t/a. what i want to know is, is it worth it to bore it .030 over for the 6 extra c.i.'s or not. im looking for about 450 N/A rwhp.

SS101

iTrader: (2)

i doubt it, any gain would be negligible and the cost to have it machined wouldn't even be close to worth it

1_bad_TA

iTrader: (6)

you can get that with the right combo of parts and tune from a stock bottom end LS1. I'm gonna have to say no to either.

silverbandit0996

iTrader: (2)

but with added inches i can make it easier, and have a more streetable motor. with potential for more power in the future.

slow trap

iTrader: (22)

well it sounds like you need to leave it a 402 and go the l92/76 route unless you find a better deal on a 408 rotating assembly.

89Formulaws6

iTrader: (52)

ive spent 1800 on my bottom end so if thats too much for you, time to look elsewhere. i'm also a college student

blksheep

iTrader: (3)

450 from a 346ci and 450 from a 402/408ci are alot different.

i think i would go with the bigger cubes

89Formulaws6

iTrader: (52)

no doubt some setups i've seen are making gobs of torque at 3k well over a built 346's peak lol

silverbandit0996

iTrader: (2)

would an LS7 crank be a good idea? or should i just save and get an aftermarket one?

BOWTIE

OK, is the block new or used? The reason to bore .030 is to give you a new perfectly round cylinder to install your new pistons and rings. I am not sure if GM uses tq plates when they hone the cast iron blocks or not, if not I would suggest getting it bored and honed for that reason alone. If they do and it has a fresh bore, then leave it the standard bore if you can get aftermarket pistons in standard bore size. As for the money, getting a block bored and honed is not that much of an expense, the trick will be finding a shop that takes pride in their work and has a TQ plate for the new LSX blocks. I would not expect the bore and hone with plate and fine finish to be over $200.00-$250.00.

BOWTIE

And no on the LS7 crank... just get an aftermarket one. My understanding is the LS7 cranks will not work with a conventional oil pump.

silverbandit0996

iTrader: (2)

oh alright gotcha. i was wondering why nobody used them.

Steve Burger

iTrader: (33)

Won't make ten cents worth of difference. Any engine builder is gonna bore the block anyway. Pistons will cost the same as well. Either should cost the same.