Hmmmmmmmmmm!!....Somebody we know building a 351?!
How old are those lifters?
6sal6

6Sally6,
I'm building this 351W with GT40 heads to go in my daily driver '91 F150... should be a nice upgrade from the 300 straight six.

The lifters are the original roller lifters from the '95 351W, but I'm going to use them.  Supposedly this engine had less than 100,000 miles on it.  I've got a friend with a roller cam 302 that he rebuilt at 300,000 miles and put the same roller lifters back into it.  That was over 10 years ago...I'm not sure how many miles he's up to now, but it's got to be at least around 400,000.

"Don't-mean-no-harm-BUTT........." When I built the "old-hot-rod" 5.0 I used the original lifters. (no clue how many miles on'em.)
After "a while"...not sure maybe a couple years...I had what was determined as....catastrophic lifter failure!  Roller(s) from several lifter was ground half off..a couple were completely gone! Ground up and inside pan. According to the camshaft grinder...."Mike, these lifters don't last FOREVER man"!
Funny thing...I drove all the way back from Texas with them in that condition!!!
I pulled the engine apart and cleaned it out and installed new roller lifters and re-ground cam. Delta Cams reground it "no-charge"!!
Now.....that DON'T mean you're gonna run into the same situ.....just shar'in!!.
(please tell me you put in a "healthy" grind!!!
Anxious to see the pix and performance
6sally6

Im putting a 351W roller back together.  I noticed half the roller lifter springs were stuck and didn't compress.  I bought some new ones on LMR for $119. 

There are about three companies that make lifters.  Above and beyond that you are paying for marketing based on whose name is on the box.  If you look at all the options you'll see that a Summit lifter looks exactly like a Trick Flow lifter, etc.  However, I would stick with Ford branded lifters because Ford's criteria for suppliers and quality is typically higher than anyone else.  If they will put their name on it that means something worth paying a few dollars more. 

6sally6, you got incredibly lucky.  Most of the time when I've seen a roller lifter failure the needles come out and lock up the oil pump and its bad, really bad.  Most times you're lucky if the engine is even rebuildable. 

More power than the 300 I6?  Surely, BUT torque is a funny thing.  Those I6s were torque monsters, especially with EFI.  Not sure what published  numbers were, but I would bet that the I6 actually made more torque than the 5.0, and at lower RPM.  Its basic physics.  The I6 has the same displacement, with considerably larger cylinders, specifically because it has a longer stroke.  All that adds up to torque.  Its how Diesels have done it for years, and why a Cummins always made more torque than a V engine, even though it was governed at 2,500 RPM (that's not a misprint)! 

Obviously the 5.0 has a lot of advantages, and the 5.8 has all those plus more displacement, so I'm not saying the swaps a bad idea or anything.  I had a couple of those 300 I6s over the years and always wondered what I could do with one power wise.  Oh well, another project that'll never come to fruition, but its fun bench racing. 

Hey Sally,  I was going to give you a ride at the Bash in Glen Rose;but, I didn't see you.  Maybe in Michigan.

https://www.jalopyjournal.com/forum/threads/5days-in-5-minutes-hemi.1127638/

This "kinda" what you're do'in Michael.......sorta?!
6s6

You ever "confir" with dummernhell(part of the MS crew) about parts and shops? He lives near your neck-o-the-woodz. Dons a good old boy butt......works a lot out of state so it might be tough catch'in up with him!!
6sal6

Well worth the "seek-out"!!
Really nice and knowledgeable  fella butt.........totally stone-cold off-the-chain crazy (in a good way). 
6s6