Chevy rods are also too narrow on the big end. Your crank journal is wider so your side gap gets way over spec. IE you loose all your oil out the side of the rods and---- don't ask me how I know this. Early H-beam rods for BB Chry were made from chevy forgings. after finish you had sometimes as much as .050 or more side clearance and OOPS no oil PSI. Stock is
.017 You needed a very large volume pump to flow enough oil to build PSI.
By the way, pumps DO NOT put out pressure. They put out volume, when the volume overcomes demand (leakage) resistance builds pressure. The spring and valve dump
volume at a set pressure. Even engineers get this one wrong. That is why a worn out engine has low oil PSI. Use chevy rods with the wrong side clearance you just built yourself a new worn out engine plus the other issues.
Have a good day all,
Rick
Tuned my last sport bike a bit on the lean side, 100k miles with no issues. Never ran hot. Dynoed before tune at 87hp. after tuning made 97 on the same dyno. If you looked at the plugs from before the tune they looked spot on, but I just had to mess with it. Lean is not necessarily bad, as long as it is not real lean. The 100k miles the bike endured was ALOT of full throttle, run it it to just shy of the rev limiter type of stuff. Keep in mind no nitrous/boost. And the crackle out the exhaust of it being a bit on the lean side was just way to cool. Oh yeah, the bike also had an ignition advancer on it....
i go to school for 6 hours and learn nothing, come home and in 5 minutes learn this... thanks guysIf you're running nitrous or boost, you've got to be careful, as these can heat up the top ring (causing it to butt and seize, breaking the top ring land) or detonate excessively hard, potentially fracturing the piston.
You need the proper tune and that the top ring land is so close to the crown you'll have to run a really wide gap on #1 compression ring, or the ends will butt together, and the result is this.
