Hi,
currently I have comp 822-16 hydraulic lifters in the Challenger's 440. I think about changing them to Crane Anti pump-ups 99278-16 because I feel the comps are bleeding a lot. Will I get pushrod length issues? How does effective lifter height compare between those two?
Comp says seat heigth is 1.88", can't find anything about Crane.

I have adjustable rockers to compensate but would want to keep valvetrain geometry as ideal as possible.

Thanks
Jens

Jens, there are two different standard pushrod cup lifters hieghts on Mopar motors, pre 1967 and 1967 and later, I think the years are correct Mopar changed the pushrod end size in 1967 from 1/4 inch ball to 5/16 ball and I'm almost positive they raised the pushrod cup hieght at the same time Contact Crane by E mail and ask them to provide you the pushrod cup hieght on thier lifters What amount of preload are you setting the Comp lifters at? I like to use between 1/4 to 1/2 turn of preload on hydraulic lifters cold I back the adjusters off very slowly and rock the rocker arm up and down until I get some slop, slowly adjust it back to zero preload and add 1/4 to 1/2 turn preload and lock the locknut down

The Crane Cams 99278-16 hydraulic lifters have a pushrod seat height of 1.580". This is measured from the bottom of the pushrod seat cup to the bottom of the lifter, with no preload. The COMP measurement is taken from the top of a 5/16" ball in the pushrod seat to the bottom of the lifter. So, 1.880" less .313" is 1.568". The Crane seat is .012" higher than the COMP. The Crane dimensions are listed in the online catalog on the cranecams.com website. Regards, Chase

Thanks for all your replies.
Currently I have Isky iron rockers that are in the engine for more than 20 years. They had been installed together with a 298° solid lifter cam, don't remember the brand. In 2010 I tamed the engine by installing an XE274H cam with the corresponding compcams lifters and valve springs. When I recently took off the rockers I found pitted valve tips on nearly all exhaust valves, car has 2000mls since cam change. Valve tips had been ok when the cam was changed. Intake looks better but seemed to start wearing as well. The Iskys also have excessive wear (flat spots) on the pads as well. Therefore I ordered new compcams Ultra Pro Magnum rockers with roller tips to lower the stress on the valve tips. I hope to get away with just changing the rockers (plus new pushrods) and keep the valves, at least for now.
The wear pattern on the valve tips seemed geometrically ok. Shaft height is ok, pattern is not shifted towards intake or exhaust side of the head, so no need for lash caps or something like that.
My assumption is that the valve tips were cut too deep on the last valve job so the tips aren't hardened anymore. Maybe the compcams XE cam did its part as well, reportedly has sharp ramps. Don't know how good the comp lifters are.
I will need new pushrods that will work with the comp rockers. These need ball/ball ends. I will visually inspect the comp lifters, but as I said, I might want to change them for the Crane ones, eliminating another source of possible reason for my failure.
Adjuster on the Iskys had two treads showing, preload is at about 1/2 turn. Valvetrain is quite noisy, that's why I took the rockers off in the first place. I hear a single clattering noise per rev which I haven't located yet. Doesn't sound like a collapsed lifter.

Sorry for the long text...

Edit: Chase, that's what I wanted to know! So I don't have to worry about pushrod length issues between those two lifter brands.