more thoughts about needle bearings
 

Consider this thought,

In ref to bushed lifters vs needle bearing lifters, driveshafts have needle bearings in the u-joints.

Re: more thoughts about needle bearings
 

I am not sold on bushing lifters yet, That being said I have supplied some customers with .937 Morel roller lifters that have worked fine.

Most of my builds I have been using the Morel .904 lifters with needles in about everything and to date not one problem.

Re: more thoughts about needle bearings
 

Guys like Carl and other engine builders would obviously see the results and the pros and cons of each type. I am no expert, IMO the needle type is more efficient than a bushed lifter. What causes a roller on a needle bearing lifter to stop turning and goon the cam etc. ? I think if the engine gets a flash of rpm, like wacking the throttle in the water, the spring slams the lifter on the cam and it puts a flat spot on a needle and that leads to a failure.

Re: more thoughts about needle bearings
 

I have run needle bearings (Isky Red Zone) for a few years now, with zero problems, as long as I send them back for a "rebuild" every winter. They won't go two seasons. Mine seldom sees over 8300, with 1015 lbs Open spring pressure.
Your results may vary. LOL

Re: more thoughts about needle bearings
 

I have had more problems with ISKY roller lifters only as far as sizing, Never been able to buy just one set always 2 sets and one build took 3 sets to get the sizing correct.

Re: more thoughts about needle bearings
 

What valve springs are you using?

Re: more thoughts about needle bearings
 

I have not had that problem.

Re: more thoughts about needle bearings
 

1356 pac.
Why does it keep changing caps to lower case??

Re: more thoughts about needle bearings
 

Thanks Ed

Re: more thoughts about needle bearings
 

1.5" diameter. I can get on all my head bolts.