News:
I hope to much fuel hasn't destroyed my rings and/or cylinderwalls. Per
Will go down 2 sizes on the primary jets, hopefully that can increase my throttleresponse aswell.Per
you need to have at least 5" of vacuum @idle in gear [only if Auto trans] with the 4.5 power valve
Per, have you done a leakdown test? You can buy the tester which is composed of 2 gauges that will show you the percentage of leakage through any one cylinder. They're not overly expensive and will eliminate, once and for all the guess work about compression/sealing. When on the engine, you can listen carefully at the carb, tailpipe and valve cover breather for the tell-tale sound of escaping air and get a sense of whether it's an intake or exhaust valve problem or a ring problem. Most new, tight engines wouldn't leak much more than 10% max to be healthy. You can chase your tail with carburation, but cold engine blowby sounds to me, like a compression problem-ring seal/piston integrity. Buy or borrow the tester, hook it up to a source of compressed air and help yourself sort this thing out once and for all. Good luck
Not bad for a cold engine, imo.wondering if it is sucking oil around the intake gasket back into the intake ports? - The big deal is uniformity and if they're ALL 170, that sounds decent. It varies due to static compression ratio and cam specs, so it's hard to say one figure is good or bad. There's a finite # of places that oil can get into the combustion chamber and it's either coming UP past the rings or DOWN past a gasket or seal. How were the valve seals? Are they the Perfect Circle type or oem umbrella? Where they installed using the slip covers? Was the clearance between the valve spring retainer and the top of the valve guide checked for clearance on the seal at full valve lift? If you put a big cam with a larger ratio rocker on the thing, you MIGHT have squashed the seals causing a leak. Was the side to side movement of the valve stem checked for clearances? Where the guides replaced, do they expose in the port? Lots of things to check as well as the previously mentioned gaskets. Fun, eh?
It sounds like the rings may have never seated and the walls are glazed.That might be it, also. I had a 340 that we put factory chrome rings back in and they never seated. There was an old trick where you fed 'er a bit of Comet to try to get the rings to scuff through the glaze, but I never liked the sound of it. Do the leakdown and listen at the breather in the valve cover for the telltale hiss if it's pissing past the rings. What a pain in the cojones!