Are main studs necessary for my application?

[Nos~4G63]

I have a nasty oil leak so I dropped the pan yesterday to re-seal it. I inspected the motor while the pan was off and found mitsu bolt's on the main caps. I purchased arp main studs and I brought them to the machine shop with the rest of my parts. I even payed for the install of my arp main studs. Thank's Specialties Machining in ft. lauderdale.
I'm wondering If I need to pull the motor dissassemble it, and re-align hone it to install a set of main studs or If I should just keep the mitsu bolt's. At what point as far as hp do main studs become an necessity? I plan on making 600whp, do I need main stud's?

Current Mod list:
ENGINE:
stock throttlebody
magnus intake
ported head with 5angle valve job
crower springs
stock cams
arp head studs
cometic gasket
wiseco 8.5-1 86mm pistons
eagle rods
align honed
bored 1mmover
arp rod bolts
arp main studs

IGNITION:
magnecore wires
ngk bpr7es plugs
stock coils

FUEL:
Walblow 255hp
aem rail
Aeromotive AFPR @ 40
FIC 850cc injectors

ELECTRONICS/GAUGES:
SAFC
MAF translator
AEM wideband 02
Boost gauge
EGT gauge
palmV w/ pocketlogger
TMO chip w/ stage3 mods,stutterbox set to 5.5k

INDUCTION:
4'' K&N
Forced performance cast intake pipe
FP3065
28''x10''x3'' front mount w/ 2.5'' piping
tial BOV

EXHAUST:
ported 2g exhaust manifold
2.5'' 02housing
tial 40mm dumped to atm.
3'' RNR turboback exhaust

DRIVETRAIN:
ACT 2600 PP
Street disk
Fidanza flywheel

NITROUS:
NOS directport @ 100hp
fuel off of rail
purge kit
bottle heater
wot switch

 

[billdo_83]

Wait so you bought ARP studs and brought to the shop to have them installed and they didnt do it?

Take your car back and have them install them for free if that is the case.

 

[TSIfreek]

Yes you need to have the mains line honed when switching over to the ARP studs. Use the studs while line honing also!! If this is not done the mains are not going to be straight and bearing failure will soon happen. The studs puts more pressure on the mains causing them to flex and loose shape and staightness. Its always a good Idea to line hone any engine rebuild because the rest of the machine work goes off the main saddles.
The whole machine process is line hone, deck, bore, then hone. Without the mains being completly straight and perfectly round the rest of the machineing on the block wont be right. Good luck with your build up and take your time

 

[nukefission]

Stick with the stock bolts if they haven't already installed the ARPs.