Lifter plunger in the 59 deg toilet

Krooser said
The 59* lifter bank angle is the killer. Petty actually cut out the lifter area in the valley and rewelded it back in the block to correct the mistake Ma Mopar made when this engine was designed.

I don't believe any LA can survive 7500 rpm for long with the stock 59* deal.

Not long without breaking parts. Slow your roll or get a 48* block.

They do with a solid flat tappet. About 8,500 rpm off the bank, though ACH-anything can happen. I'm sure you're well experienced in that occurrence.
An old friend did some racing in the early Jimmy johnson cajon speedway days, they were trying 273 rockers lol, they threw rods and broke stuff figuring it all out..but they got it figured out after a while, that mostly one race was all they'd get out of it, and found the stock parts and oversll design limits pretty quick.i wish he had kept some of that stuff. Last time I saw him he only had a few W2 and other weird odds and ends that have holes,twists,or cracks in them..though I think his partner may have the motors..idk.

I'm sure you're aware but, for those who aren't..There's a few symptoms from that fucked up lifter angle one of them is lifter cup boring... especially if the pr. tips are aren't right for the cup 'comp cams mass produced and let put a bunch of sharp edge at the seam ball end push rods in the 90's that killed all removable lifter cups in that style lifters in sbm...now that wouldn't happen on a 48 degree being straight up and down. There wouldnt be the angularity . That's why the lifter bores are suspect by most, on here too. The other mostly known thing is the pushrod tunnels on the head need modifying , mostly out on the bottom and in on the top, looks like an hour glass if you could do a cutaway on a head after modifying. O never knew the crane retrofits to have any issue, our buddy Brian's put one in his dart...worked fine, was only .500 n something lift 'the smaller one'
Bummer