Maybe I missed it but did you hold the throttle wide open ?
Most are surprised by how much difference it can make.

WP

 

I Did hold it open

 

Hey, I got around to doing a leak down test I removed pushrods and put engine at TDC on the compression stroke.
Before that I did another cylinder compression test and got 110psi both front and rear
Ok so back to leak down
I calibrated the tester motor TDC on Comp stroke
Front cylinder had between 15-20% , no sounds from exhaust , no Bubbles in oil
Very very very faint sound of air through intake

Rear cylinder was a whoa!!! Gauge all the way to red...you could hear the air and out of the pushrod holes you can hear and feel the air just spewing out.
Again nothing from exhaust or oil tank


So intake valves? Possibly bent? But how could I get that much compression with such a leak?
Maybe before removing beads I can go in with a bore scope or at this point should I just remove heads?

Appreciate the help.
​​​​

 

I'll start by saying that I'm not a fan of compression tests, dynamic or leak down either one. While they can be a tool to help pinpoint a problem when combined with other supporting evidence, they are a terrible method on their own of indicating there is even a problem, or to give any meaningful indication of the health of an engine, the fact you got different results on the second compression test compared to the first one is just one of the reasons why. Way too many uncontrolable variables.

Was this a running engine before the new jugs and pistons? Why were they replaced? Were they replacement to fix a problem or just to get fresh new cylinders on a tired engine?

 

Engine needed an overhaul
Crank pin was no good so it got replaced
Pinion shaft same thing and the gear shaft as well
Had that all done at shop , not myself.
So I figured new jugs and pistons too

 

If it were me I’d carry on and fire it up, just pretend like you never did a compression test because I highly doubt there’s anything wrong. If (big if) there turns out to be an actual problem then deal with it but so far in my opinion you have no evidence of anything wrong.