More like "push air trough spark plug hole and see where's it coming out of test"...

I put 100 PSI in cyl #6 and with BOTH valves closed A LOT of air was coming out of the breather holes (it popped the PCV valve twice!). With each valve open air was coming out of the intake and exhaust respectively.

Did the same thing on cly #1 and #2 and NO air was coming out of the breather hole when both valves were closed.

Does this mean the rings are bad, or could it be a blown intake or head gasket ? I think it could be both. Any ideas ? :/

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92 Z28 L98 350
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Ported and polished heads, ported stock TPI base, ported plenum, Comp Cams XR270HR-10 cam (lift .495/.502 duration 218/224 lobe separation 110), Edelbrock TES headers, LT4 valve springs, Crane AFPR, Flowmaster catback with LT1 style tips, MSD coil & wires...

"Take that auto, drop it in first, hold the brakes, stomp the gas and grin from ear to ear! :-)

 

Sounds like either broken rings, ar rings siezed up in the piston. Either way, the thing will have to come apart. Yuk!

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Working on:
'84 Z28 LG4 305
Added dual elec fans.
145 MPH IROC Speedo
Building 430 HP 350
using primarily GMPP parts.
Block is in shop!

 

btt

 

First, determine how fast the air is leaking out.

Second, squirt some oil into the cylinder (to seal the rings)

Now, how fast is the air leaking out?

If it is at the same rate, the valves would be suspect.

If no air leaks out, suspect the rings.

If some air is still leaking out, but less, then both the rings and valve(s) are suspect.

 

It could be a blown head gasket also, but you'll still have to take the head off either way.

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H.D. Tripp-89FormulaWS6