Tainted

iTrader: (9)

Ok, im assembling my LQ9 408 shortblock and have run into a problem with my main clearances. I'm going by the factory manual of installing and checking clearances, sorry no fancy tools here.

Eagle crank, rods, and srp pistons, all brand new.

Originally had CLEVITE H bearings, installed those and plastigaged it.
with the clevites, I ended up around .0001-.0015, maybe just a smidgen more.

Not nearly enough clearance for an iron block (shooting for close to .0025)

So, I bought a set of SEALED POWER standard size bearings.
Clearance was just a tiny bit better
.0015-.0020

Still, not where I wanted to be SO

Bought SEALED POWER UNDERSIZED .010 bearings
Now heres the fucked up part. I HAVE EVEN LESS CLEARANCE!
All the way across .0001


WTF??? I thought the UNDERSIZED bearings ADD .0001 more clearance, in my case I LOST clearance... am I missing something? WTF am I doing wrong here? I need .0020-.0027 for my mains.

Thoughts? Suggestions? I really dont want (or see why) I should have to turn a brand new crank to get the clearance I need.

DietCoke

iTrader: (18)

Under bearings are for turned (undersize) cranks. Generally that would reduce clearance. Get a proper measure. Plastigage is a no-no... rent the tools you need to measure properly

Tainted

iTrader: (9)

Ive got mics n all to measure the journals etc, just no bore gauge.

So I need an OVERSIZED bearing then correct? It seems like half the world says yes, the other no. Which is truely which

TurboMonte100

iTrader: (1)

I think so too, under size are for worn or polished used cranks, and the .0001 would have only slightly helped. You need a .001, I think the mains you need are MS2199H1

Here is a link some interesting reading on clearences.
https://ls1tech.com/forums/generatio...estions-2.html

Tainted

iTrader: (9)

Ok so are these considered over/under sized?

TurboMonte100

iTrader: (1)

The terminology is sketchy, they are listed as undersize, but they say they add .001 clearence.

This link may be more helpful to you.
https://ls1tech.com/forums/generatio...lsx-block.html

Tainted

iTrader: (9)

I stumbled on that thread when I first searched this issue. The federal mogul seems to normally be slightly looser and I came across Federal Mogul 152M1X, are those what I could use as well?

TurboMonte100

iTrader: (1)

Thats the way I understand it, use the FM if you want the looser of the two.

Tainted

iTrader: (9)

Happen to know of anyone around indy that would happen to have a set?

Tainted

iTrader: (9)

well ordered the federal / sealed power 152M1X. Should be here thursday or friday =/

TurboMonte100

iTrader: (1)

I seen that Orileys lists sealed power, you could check the local store.

Tainted

iTrader: (9)

no luck already tried orileys, speedway, auto zone, advance auto, pep boys, sears

TurboMonte100

iTrader: (1)

If you have any problems, I can usually get parts from my supplier next day.

Tainted

iTrader: (9)

Hmmm I may have to hit you up on that

RezinTexas

I used Clevite MS-2199HX to give 0.001" more clearance per bearing (0.0005" per half shell)

Also, I used a mitutoyo 511-169 bore gauge to measure everything. its a good investment that you might want to consider. Here is a link, Amazon used to have them for about $90 cheaper.

http://www.shamrocksupply.com/itemDe...odeId=10168090

Tainted

iTrader: (9)

Hopefully I dont have half the grief with the rod bearings as I did the mains. Got clevite for the rods as well, std size

Tainted

iTrader: (9)

I got my bearings today and im VERY happy to say I have great clearance! .025-.030 via plastigage which I know isnt everyones favorite