Noah Burns

iTrader: (5)

I just got off the phone with Speed Inc and talked to them about the LS7 lifters, I said which lifter do you suggest for my setup, the BTR, LS7 or Caddy... he said, "we always suggest the LS7 unless you'll be spinning crazy RPM. We have the LS7 in several 1000+ rwhp cars." he also told me some of the things to look for in the LS7 lifters that had problems in the bad batch a couple years ago. I am going to check mine out and see if any of them show the signs he spoke of and go from there.

99s10sbc

iTrader: (2)

Interested on the signs to look for although mine where new when installed they where a few years old

Noah Burns

iTrader: (5)

he said look for burring around the body, roll the roller right out of the box in your finger and feel for binding ( that was the main point that he stresses, he said that was the most common thing they found )

99s10sbc

iTrader: (2)

hmm I checked all of mine even the ones making noise and they felt fine everything looked good on them. It would be best if we could get a batch number or a lot number of where these bad lifters came from that way they could be avoided. I may contact BTR and see what he says as I will have an aggressive cam and higher spring pressure.

Noah Burns

iTrader: (5)

I'm going to run the TU1 from speed inc in mine and won't be running a ton of RPM since it will be boosted so I wont have to worry about it.

If I were going to be running a lot of RPM, personally, I would run something like a Morel lifter with the link bar. The higher RPM causes a stock style lifter to want to rotate in the lifter cup/retainer (a major cause of failure) the link bar will eliminate that naturally.

Having said that, I ran my 2001 4.8 with a 224/228 .575" lift cam with stock 2001 lifters to 7000RPM several times a day for several years and never had an issue. A lot of this game is luck. A lot of it is how you maintain your machine. And a lot of it is the parts you use. When you have all of those things on your side, it's called magic!

black00chev

iTrader: (2)

The shop I had my work done checked pushrod length with the LS7 lifters and also factored in milled heads and head gasket. So I know everything was setup right and boiled down to a bad lifter. I don't know what answer your looking for but that's what it came down to in my situation. And even with a new set, they're still a little loud on one or two lifters, probably do to tolerance differences.

99s10sbc

iTrader: (2)

Spoke with Brian Tooley he said he has had zero problems from Morel 5206 lifters so that is what he would use. I have a friend in parts at a Chevrolet dealership and I see first hand how many lifters crap out on them on oem stuff. Some people run them and they work great others don't have such experiences with them.