Well since you had so much crap from the failed cam and lifters go thru the motor then maybe there was still enough grit left in the blocks oil galleys and the oil passages in the crank to take out a new rod bearing when it got pumped in.
Try this.
Get the motor fully warmed up by light driving so as to get some oil temp taking place also .
Try to simulate the motor being under load.
With the motor at idle out of gear ramp
up the timing ( maybe a lot ! ) a long with cranking up the rpm by means of the idle speed screw and see if you can start to hear this knock take place.
If you can then pull one plug wire at a time to see if it goes away.
If this does not turn up anything then I would unbolt the converter, slide it back out of the way and look carefully for any cracks as you rotate the motor over little by little.
Failed flex plates can make some strange noises.
One thing I can tell you for certain is that once you hear a rod knock ( from a rod that’s going south) even under light load and low rpm you will never mistake it again for anything else.
If it’s a wrist pin going bad then that makes a double slap knock sound at TDC and BDC, kinda like a castinette .
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
Last edited by steve25; 05-31-2025 at 04:21 PM.
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