[Jim Moshier]

Originally Posted by 455Darren

using the Lucas 30w break-in oil and the paste on cam lobes and lifter faces. Changed oil and WIX filter between failures. Pre-oiling to 60 psi as well. Getting pricey.....

I don't have an opinion on Lucas break-in oil BUT, I would try another break-in oil to eliminate that varible! JMHO

[zippy]

Originally Posted by 455Darren

using the Lucas 30w break-in oil and the paste on cam lobes and lifter faces. Changed oil and WIX filter between failures. Preoiling to 60 psi as well. Getting pricey.....

70 455HO here too .040" over bore 4.25" stroked. #64 heads. Pretty much the exact same combo.
Melling SPC-8, Crower Cam saver lifters, 1.65 roller rockers.
Broke in with Lucas 30W and slathered the cam in Break in Lube. About 3000 mi on her now, all seems well. I do have 1 lifter that bleeds down more than the others, depending if engine stops with that valve open. Takes a few seconds for the clacking to stop. But all puhsrods rotate.
Engine is very strong. Even with 3.08 rears, 2400 stall, Easilly light the 275 40 18 Nitto 555 on the rear

[Dragncar]

Originally Posted by Jim Moshier

Just a thought but you might want to try a different oil as well, maybe a Driven break in oil or ? I don't know what oil you have tried but after 2 failures I would encourage it along with pre-oiling before the start.

When Mike made his post about turning your mocked up engine over by hand with cam and lifters without lube and looking for lifter rotation......... that seems to be the way to go from here on out.

[Jay S]

After having 2 HFT cams with issues on separate lobes, I wouldn’t consider using another HFT cam in this engine unless the cam was Nitrided. I think Paul K may have a Nitrided Crower 60919 floating around yet in his collection, see if he still has it, put the Crower cam savers on it and get back to enjoying your car.

[grivera]

If I were to do an FT cam, I’d check it as indicated for slope / all lifters rotate before nitriding it. Would suck to have that done and still have a cam that doesn’t rotate lifters.

[Jay S]

Originally Posted by grivera

If I were to do an FT cam, I’d check it as indicated for slope / all lifters rotate before nitriding it. Would suck to have that done and still have a cam that doesn’t rotate lifters.

That wouldn’t hurt, but I believe he already checked the lifters for slop on the second cam he tried.

A Nitrided cam makes the surface of the lobes much tougher and doesn’t allow the taper to be taken off of the camshaft during the break in very easily even when some lifters do not spin all that well at first. It helps mate the lifters to the cam lobes and will not remove much taper on the cam from the break in.