LCS

iTrader: (9)

Is align boring really necessary when using main studs?

If true, should I align bore with the bearings installed or not?

Murf

iTrader: (2)

Align honing is the proper way to have a block done. Main studs are just a good idea if you are going for more power. Make it strong.

20gmr

iTrader: (7)

The issue when switching from main bolts to main studs is the clamping force is applied differently. I know it sounds dumb, but a bolt holds the block to the girdle and a stud holds the girlde to the block. This force acting in an opposite direction can sometimes have a tendency to distort the block. That is why the alignment of the mains must be checked when you switch. I would say 9 out of 10 cars are unaffected but every now and then it can be thrown off a small amount.

LCS

iTrader: (9)

So I´ll just torque them and verify the alignment. Hope It doesn´t need any machining.

THUB

iTrader: (5)

I would be very surprised to see any variation in alignment due to main studs, especially with the Evo's main girdle. Definitely plasti-gage the journals, though. If the clearance is different on one end of the journal, something's amiss.

LCS

iTrader: (9)

You say plastigage both ends on all journals?

I already bought ACL race bearings and a new crank. Plastigage is on the way, too.

THUB

iTrader: (5)

I usually just lay a long piece across the journal. You can see taper in the clearance that way. I'm neurotic about bearing clearances. Also, never, under any circumstances assume your clearances are good and just bolt together an engine. The chances that something will go wrong is not worth the money saved on plastigage.

bostonhatcher

iTrader: (18)

Torque the studs down without the crank or bearings and measure the vertical and horizontal bore of the journal. Should be the same. If the studs did distort the block, then the vertical will be shorter than the horizontal.

nos51

iTrader: (30)

you rarely need to align bore the motor after studs,but they can throw off you bearing clearances if you measured them before studs etc. just check your clearnaces no biggie

xspsi4

iTrader: (67)

It is absolutly 100% necessary to do this after a main stud install if you don't you could risk damage to the engine soon.

Do not skimp this critical step!!!!!

Chris@nolimitmotors

iTrader: (277)

+1

awd2gen

iTrader: (4)

definitly needs to be done when switching from bolt to stud.

Gary@MellonRacing

iTrader: (74)

and if u have ur build motor , using arp main studs , and u lift ur car to replace the arp main studs u have already with new ones ??? beacuse they were overtorqued the first time they were put in ..

LCS

iTrader: (9)

I'm switching from bolts to studs for the first time on this block.

I'll begin the rebuild this week. I'm still not sure if i'll stick with bolts or switch over main studs.

If the block do distort, then I'll have to align bore it and use oversize main bearings. Not very fond of that.

wreckleford

iTrader: (2)

Absolutely necessary to align hone, or to check clearances?