[Nyairguard]

getting .0025 and .0028 , im using plastagauge cause i dont have a bore gauge think this ok for a street build or should i tighten it a little with a 1/2 shell oversize 4040M1 on the lower caps? I did assemble and torque with 30w on the bearing surfaces cranks turns smooth as butter

[Gach]

Originally Posted by Nyairguard

getting .0025 and .0028 , im using plastagauge cause i dont have a bore gauge think this ok for a street build or should i tighten it a little with a 1/2 shell oversize 4040M1 on the lower caps? I did assemble and torque with 30w on the bearing surfaces cranks turns smooth as butter

I wouldn’t worry about it, you can play with oversize and not actually change much. Just run a good oil.

[steve25]

Your fine especially if your running a crank with 3.250” mains.
Just be sure to run a 60 psi pump with its 3/4” pick up.

If your crank is new or was cut be sure to double check your thrust clearance and that at the extreme’s of that movement the sides of the bearings are not touching/ riding on the radius of the cheek of each main crank journal.

When you stuff the Rod’s in do the same in regards to that confirming that the side edge of the bearing is not riding up on that radius.

Judging by your main clearance you will likely have .0025” Rod clearance which is fine also.

[Nyairguard]

It’s a 400 and the thrust clearance is .008


Sent from my iPhone using Tapatalk

[steve25]

Plastigauge will always give you the minimum clearance that you have provided that it’s fresh plastigauge, but with that said frankly it’s hard to get a resolution better then .0005” with using the stuff, so your main bearing clearance may be closer to .0022”.

The range for crank end play is .0035” to .009”, so your good with that also.

I however would run no lighter then a 10w40 oil.

[mgarblik]

Should be just fine. I have never had an engine fail from loose bearing clearances. Too tight, absolutely. Obviously, there is a limit both ways, but you are fine IMO.

[Nyairguard]

I’ll just leave it, I seen a couple of dirt specks so I’m gonna take the plugs back out and replace them, scrub the block again.. I also did the stake front gallery plugs trying to save some time but I’m gonna tap them as I have done in the past .. just don’t trust the staking


Sent from my iPhone using Tapatalk

[geeteeohguy]

Originally Posted by Nyairguard

I’ll just leave it, I seen a couple of dirt specks so I’m gonna take the plugs back out and replace them, scrub the block again.. I also did the stake front gallery plugs trying to save some time but I’m gonna tap them as I have done in the past .. just don’t trust the staking


Sent from my iPhone using Tapatalk

You'll be fine. The general rule of thumb with most engines is .001" for each inch of journal diameter. Assembled a 389 with .003" main clearances about 15 years ago and that engine has seen many thousands of trouble free miles with no issues at all.