Cylinders 5 & 7

Cylinders 1 & 3

Header off turned on side
No one can figure this out. 5.3 just freshly rebuilt except for pistons and crank. Which was all fine cylinders still had hatch marks from factory. Tsp 224r .600/.600 lift 110lsa, PAC 1219 single beehive springs, chromoly pushrods, new valve seals, 862 heads with a valve job, not ported and polished, long tube headers, roller timing chain, new oil pump, 2800 stall converter. Nothing extreme. Problem is, started up for first time Sunday and have oil coming out of driver side header. Only ran it for around 10-15 mins if that. It’s not tuned yet. Seems like cyl #7 isn’t firing as all the new header pipes turned a goldish tint except for cyl #7 still looks new. Removed the header yesterday no oil in exhaust ports. No oil on plugs, cyl#7 plug smells like straight gas. Kinda wanted to find out where oil is coming from before firing back up or to get tuned. Codes thrown were p0300 multiple cylinder misfire cause no tune and the computer is freaking out, egr which is deleted. O2 sensors bank 1 sensor 1 which was in the driver header probably what caused excessive fuel on driver side, and the 2 after cats which are no longer there anymore. All help greatly appreciated. Any questions please ask. I’m sure there’s something I forgot to say.

 

Hello,
What is the history of the block-pistons? New to you or you have previously ran for a while?
On the rebuild-----
Did you put new rings in it? Did you hone the cylinders?
Condition of valve seals, if not top hat style look for separated seals from too deep of install.
The oil has to come from either the rings or the head. I am thinking that it blows threw the exhaust port then collects in the header collector.
Could try a leak down cylinder test, check for an air leak.
Hope this helps.

 

Problem solved. It was a stuck injector on cylinder #7. Washed oil off cylinder wall into header. Thank you very much for the reply.