catastrofic caddy lifter failure...
Sorry to hear your problem... I had the same thing happen with stock lifters 2 years ago. So everyone knows stock gm lifters application are as follows 4.8, 5.3, 6.0, and yes 7.0 LS7, same part number.... Found after research that I had to much preload.. I now run less than half of recommended preload with no concerns of valvetrain unstability. Just a little noisey on intial startup for a few seconds, but will rev to 7,000 rpms very quick. Goodluck
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these had 2k miles on them. got them about 6-7 months ago. i actually waited for them to come off backorder and held up my build for them. tfs 215's milled to 60cc, tsp torquer 2 cam, ported ls6 oil pump. had great pressure up until they let go. then i lost it. running the patriot extreme gold springs and they all seem to be perfect. i rev it to 6800 when im in it. it just got noisier over the last 500 miles or so. i chalked some of it up to the fats manifold being a thinner plastis etc but i guess that wasnt the case. im wondering if i just got a bum batch as there are several people running them with success.
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i had a set of these like that before i put them in.. was looking in the box and noticed that it was cracked just like that looked like it was dropped before shipping and i also noticed alot of the other lifters 4-5 of them really nicked up.. called sdpc and sent them back waiting on my new set now.. makes me worried about buying them 
might just put my stockers back in..
might just put my stockers back in.. 
Thread Starter
9 Second Club
iTrader: (11)
Joined: May 2005
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From: in your closet
i had a set of these like that before i put them in.. was looking in the box and noticed that it was cracked just like that looked like it was dropped before shipping and i also noticed alot of the other lifters 4-5 of them really nicked up.. called sdpc and sent them back waiting on my new set now.. makes me worried about buying them might just put my stockers back in..
might just put my stockers back in..
i was told by sdpc that they come in like a big set then they get reboxed and sent out.. so there is a poss sounds like a shipping issue and a handling issue when i returned the shippment on my return slip i stated that i wanted them wrapped carefully and then boxed.. and shipped so i will see how they are when i get them back...
...what he said.. howudodat ..
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I think mine are the LS7 lifters but they looked like the original LS1 lifters they replaced. I don't know what the difference is in the LS7 & caddy lifters but I hope these hold up better. Got me thinking now tho. Good luck with your rebuild.