New engine 150-120-150-150 compression

[vintagemuscle]

I recently assembled this engine and it currently has about 70 miles on it. I used the mototune break in method with a T61 at 17psi.
Should I be worried about #2 compression being low or wait and put some more miles on it and see if it improves? The engine doesn't smoke at all and runs perfect but this bothers me. I set the ring gaps to .019 top and .023 second ring.
This is using Wiseco 8.3:1 pistons.

 

[RvlutionMtrsprt]

Do a leak down test if you can. Who did the valve job? You may be loosing compression there... Did you try putting some oil on the #2 piston and re-checking compression? I'd do a little more investigating, that much variance would bother me.

 

[T9S1i]

I would still wait a while. I didnt even check mine until about 250 miles on the motor and i had 180 across the board with my weisco 8.3's. IT wouldnt hurt to do more tests and checks, but i wouldnt really start worrying until 300+ miles on the motor. Thats just my thought on the issue, others might start worrying now.

 

[vintagemuscle]

Do a leak down test if you can. Who did the valve job? You may be loosing compression there... Did you try putting some oil on the #2 piston and re-checking compression? I'd do a little more investigating, that much variance would bother me.

The valves are fine. I had this head on my last engine and everything was fine. Valve job was done about 2,000 miles ago.
I guess i'm just going to have to wait and see if it improves. Even if it doesn't, i'll just wait till winter time to re-ring #2 anyway.

 

[Sharkcus]

The valves are fine. I had this head on my last engine and everything was fine. Valve job was done about 2,000 miles ago.
I guess i'm just going to have to wait and see if it improves. Even if it doesn't, i'll just wait till winter time to re-ring #2 anyway.

Hey, it's you! (Cleveland Racing FTW!)

Anyway, as you probably know, I just finished my rebuild and I put almost exactly 60 miles on it, mostly on my way to the shootout. I varied the RPM quite a bit. I checked my compression last night and I had 155 on each with a grand total of 59 miles on the clock. I don't know if that helps much, but that is on a junkyard head (I did the overnight "oil test" on the valves, no leaks). I would definitely say there is something wrong.

 

[Big Woo]

Did you spend some time tuning your engine with your DSM link and wide band O2 prior to preforming the mototune break in procedure?

 

[vintagemuscle]

Did you spend some time tuning your engine with your DSM link and wide band O2 prior to preforming the mototune break in procedure?

Yes, I made sure the a/f ratios were up to par and wasn't drowning the engine in fuel. Everything is fine now after 1,000 miles. Compression came up on #2 and all cylinders are within 3-4 psi across the board. Readings are now 150 across dead cold and 170's across warm.
This is actually one of the blocks that I picked up from you. Thanks again.