Crower flat tappet lifter

[Sewalsn20]

I ordered a set of crower flat tappet hydraulic lifters and all looked good except for this one... the bottom face has a weird maybe machining error or something on the outer edge on the 5 o clock position in this picture. i already reached out to them but they won't get back until monday probably. what do you guys think of this? would this be a no go to run?

 

[Lefty71]

Does it spin properly??

 

[Sewalsn20]

Does it spin properly??

i have not gotten my adjustable pushrod yet to check pushrod length and i dont have any extras laying around to mock up.

 

[lewtot184]

That finish is correct fo creating the convex shape for the bottom of the tappet.

 

[threewood]

You don't need pushrods to check for spin. Light coat of lightweight oil, drop the lifters into the bores, mark a top edge with a sharpie and turn the cam over by hand by the sprocket. The lifters should spin in their bores and not stick.

 

[Geoff 2]

Are you talking about the slight indentation on the lifter edge adjacent to your thumb nail? It looks like a small chip. If the cam you are using is designed for the 0.842" Chebby lifter no problem. What are the cam specs?

If the cam is designed for the Chrys 0.904" lifter, then you should check it; because the lobe goes right towards the edge of the lifter.

 

[68-500]

Set it a piece of glass or known flat surface make sure it rocks slightly all directions. I can’t see the blemish on my phone.

 

[Sewalsn20]

Are you talking about the slight indentation on the lifter edge adjacent to your thumb nail? It looks like a small chip. If the cam you are using is designed for the 0.842" Chebby lifter no problem. What are the cam specs?

If the cam is designed for the Chrys 0.904" lifter, then you should check it; because the lobe goes right towards the edge of the lifter.

yes .904 lifter and yes that indentation on the edge. it looks like something scraped it when you get a good eye on it (sorry for the low quality photo). cam specs are .474 lift. 280 adv duration. 110 lsa

 

[Sewalsn20]

Set it a piece of glass or known flat surface make sure it rocks slightly all directions. I can’t see the blemish on my phone.

it does have a crown on the lobe surface. it's the indentation on the edge of the face where my thumb nail is, sorry for the low quality photo

 

[Sewalsn20]

You don't need pushrods to check for spin. Light coat of lightweight oil, drop the lifters into the bores, mark a top edge with a sharpie and turn the cam over by hand by the sprocket. The lifters should spin in their bores and not stick.

okay good to know, i didn't know if not having seat pressure on the lifter would prevent or make the lifter spin too easy in the bore and not give a good indication

 

[Sewalsn20]

That finish is correct fo creating the convex shape for the bottom of the tappet.

not the finish, but the small indentation on the bottom right edge of the lifter face. sorry for the crappy photo, it's a bit hard to get a good picture of something so small and i think uploading straight to this website lowers photo quality some.

 

[padam]

From what I’ve seen they chamfer the edge by hand. Probably just hit that side a little too much.

 

[Sewalsn20]

From what I’ve seen they chamfer the edge by hand. Probably just hit that side a little too much.

if that's true, it definitely could've been from a file, sure what it looks like. i just don't want that to be a spot where the lobe catches or wears on and makes it fail prematurely

 

[Geoff 2]

Is it a MP cam? Looks like it. 280* adv, 0.480" valve lift, 0.316" lobe lift. That is a very mild cam, even on a 842 Chev lifter. Crane's most aggressive 842 lobes have 0.328" lobe lift for 238 @ 050. Your cam has only 316 lift & is used with the bigger 904 lifter.

Bottom line: no problem using that lifter with that cam.