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I've wondered about running additional ZDDP as well. I've got an AMC 360 with a mild cam and hydraulic lifters that has had zero cam/lifter issues. The engine is out of a '71 Matador. It's seen regular 2500 mile oil changes using Castrol 20w-50.

As @6pktgo suggested. Compression test. Two adjacent cylinders with equal but low pressure is rhe giveaway. At the very least I would drain and flush the radiator, refill and run it again. White smoke or overfill level on the dipstick. That water is either going out the tailpipes, or it's gonna...

All I did after 23 years of sittin' was to fill the crank- case and spin the oil pump. 50 lbs oil pressure. Most of the assembly lube on the cam had since dried up, settled to the bottom of the pan, with no affect on the lifters. The bottom surface of the dipstick showed just a little...

Cranking the engine by hand at slow rotation isn't going to wipe out a cam lobe. If that were the case, then turning it over to find TDC would've wiped out every flat tappet cam in existence. My engine sat wrapped up for twenty three years on an engine stand. Periodic turning over by hand to...

One other thing to check is your battery cranking voltage. Too low a voltage equals a high resistance, and less voltage to the starter. Also check the starter cable for any burn through.

Not to familiar with your carb. Is there any way to adjust the vacuum diaphram to a lighter setting? Quickfuel made this easy with just a single screw adjustment, where the Holley's had us changing out different springs.

While I'm a complete novice on the workings of a 727, I had the exact same instance occur on a brand new '76 727HP rebuild. I run a Winters Sidewinder cable shifter. The trans would not kick down no matter the cable adjustment, no matter the lever length. (Got one with 3 different holes...

I would also check how much upward travel there is at the pinion snubber. Jack the pinion up and note how far up the travel is. While you have it jacked to it's highest point, look at the front yoke and see if spline engagement on the trans tailshaft is within specs. Rapid vertical forces at the...

I've had pushrods punch thru the rockers on a completely stock motor that had been freshly rebuilt, utilizing the 5/16" pushrods and stock single valve springs. The culprit turned out to be bad lifters, and a cracked rocker arm shaft. Though, I think the shaft cracked due to the forces applied...

My thoughts also, as the problem seems to be narrowed down to the pinion/yoke area. Jeepthrills01? Owned a few in my lifetime. I love 4-wheeling....

Is the pinion bearing tight and free of movement? Another question; does the noise happen when you make a turn in both directions, or just one?

Sunk valves would make for a very poor running engine with audiable evidence. Been there, done that. I don't believe that is what the OP is explaining in his case.

Thanks for the response KD. Had a friend running a '69 Charger six pack in Roswell. His carbs were set up for an altitude of 4200 feet. He was an avid dragracer. He never changed the cfm ratings of his carbs, only jets and squirters to compensate for altitude, and a rough estimate for ambient...

No disrespect but, were you on the beach at Daytona, or in Denver with their claimed mile high status? (PS....Albuquerque is higher than Denver). I set my 750 cfm on the 366 @ 6200 ft above sea level. (Albuquerque) Makes a huge difference for carburetor response and engine performance.

I have a 750 cfm holley on a 366. Burns rubber for half a block. 4200 ft elevation. Your 74 jets seem rather large, as I'm running 66's. The rule of thumb is to drop 2 jet sizes per 2000 ft of elevation from sea level on sea level set set up Holleys. Accelerator pump cams also come into play as...

Figure 8's will work better as you're forcing the locker to engage from side to side. Make them as tight as you can. You don't have to be burning rubber to do this. You don't want wheel spin.

Did you try turning a few figure 8's? Force the lock side to side.

Please report back. Thanks!

I had a sticking suregrip as you describe. Fresh rebuild. Added the friction modifier and turned a few figure 8's on an asphalt parking lot. The noise stopped.

Good shot of them here. They're the ones that are 7.50 inches long, rated @ 1200 deg. They work very well.