Some background:
Just installed a remote oil filter and oil cooler and after the install had lower oil pressure.
Got four laps in with good temp, oil pressure 35 psi, ran strong, no noise. Started down straight and about at pit road entrance got a loud pop with smoke coming out from hood. Maximum RPM that day was 5836.
Took block apart and found the two rods/pistons that let loose (#2 & #6) did so without a problem as a result of valves contacting pistons - no valves contacted any pistons. #2 & #6 - The rod bearings are gone and the bearing mount surface is black, as in, they were really hot from rotating on the journal without a bearing. One is still on the crankshaft and the block (original to car) is junk. But like I said - no noise or indication that there was a problem. Main bearings and other rod bearings are good.
Unbolted cam gear and found sheared off gear pin. All the pushrods and rockers are okay. There's lots of bronze filings in the oil filter and the cam is stuck in the block.
Attempted to get cam out - put slide hammer to it and wouldn't budge. Turned block upside down and found chunk of wrist pin locked between cam lobe and block. Punched out wedged piece of wrist pin and cam rotated easy. Cam bearings in good shape.
Possible sequence?: rods let go after bearings cook out (no/not enough oil?), wrist pin gets between lobe & block, cam locks up and shears cam pin with crank still going.
How the hell did no valves hit pistons with the end result of push rods & rockers untouched?!!! "Lucky" I guess.
This is the Eagle rotating assembly that was used:
https://www.summitracing.com/parts/esp-158004160Edelbrock ProFlo4 EFI, Edelbrock Performer RPM heads. custom Comp Cams cam (.622/.617 lift, 113 lobe separation, & 228/234 duration), valve springs, roller hydraulic lifters, Harland Sharp rockers, Canton oil pan & windage tray, Melling HV oil pump, ATI harmonic balancer, Canton remote oil filter adapter with a Mishimoto cooler. TKO-600 Tremec with an aluminum Science Friction flywheel and an Atomic Twin clutch. The accessory drive system is a Billet Specialties assembly and the headers are modified Hooker Super Comps that exit to a custom 2.5" exhaust system.
The block assembly was machined, balanced, and assembled by a local shop that I trust four years ago. There's less than 100 hours on this engine. The weekend before the track event my wife & I took a 90 mile cruise with no noise or problems.
I understand that 35 psi oil pressure isn't optimal, but oddly began with the remote oil filter/cooler install. Had it to do over I'd disconnect the the remote setup, put a filter on the engine , and run it to see what the pressure is. Hindsite is 20/20...
That's why I want the build literature. (and any other help)