limits of stock lifters
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04-09-2007, 02:37 PM
#9
I'd second the caddy lifters as well. GM spent a good amount of money engineering them specifically for ls1 applications that spin high rpms for sustained time intervals. Works for me. Plus they are roughly $250 shipped to your door from SDPC.
04-09-2007, 11:53 PM
#11
'99 LS1 shortblock with upgraded bolts, ported LS6 pump, LS2 Tchain, big cam/heads, with stock lifters/rocker arms and spun it to 7100rpm hundreds of times in the 20K miles I drove it. No signs of wear. (supposedly 23K miles when I got it)
I would rebuilt the stock rocker arms (Harlan Sharp) before doing the lifters. If you have the coin do both. The rocker arms fail more often.
I would rebuilt the stock rocker arms (Harlan Sharp) before doing the lifters. If you have the coin do both. The rocker arms fail more often.
04-10-2007, 04:33 PM
#13
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The OEM lifters have been updated some since 99 as they're also used in the LS7 with a 7000 stock redline and a warranty. They're $135 from Texas Speed.
My thought is to get new OEM's if you're just doing a cam or head/cam swap on a stock bottom end. There's no use in getting bulletproof lifters since it's best to stay under 7000 on a stock bottom if you want it to last awhile. If you're building the motor get the Caddy Racing lifters.
Jason
My thought is to get new OEM's if you're just doing a cam or head/cam swap on a stock bottom end. There's no use in getting bulletproof lifters since it's best to stay under 7000 on a stock bottom if you want it to last awhile. If you're building the motor get the Caddy Racing lifters.
Jason
04-10-2007, 05:37 PM
#14
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LS7 lifters FTW!!... cheap, proven performance.
like everyone said, if your spinning the motor high enough for *updated* LSX lifters to handle then you would probably wanna think about rod bolts and bearings before the lifters.
like everyone said, if your spinning the motor high enough for *updated* LSX lifters to handle then you would probably wanna think about rod bolts and bearings before the lifters.
04-10-2007, 08:54 PM
#16
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Originally Posted by MOTRUBL
Like the title says. What's the limits of stock lifters??
The last one we did was a LS1 block with a 4.125 bore sleeve kit, 427 c.i.
It puts down 551 rear wheel HP and 515 rear wheel torque. Stock lifters, this car sees 6500 rpm everytime it's out.
Harold
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04-12-2007, 11:17 PM
#18
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I'm running a 423" iron block with a .628/.645 lift cam. I'm wondering if I should install new lifters or keep these ones. I've had them to 6800 several times with the old motor (cam had .596/.596). They've got about 63k on them.
02-01-2008, 05:57 PM
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I replaced mine at 33000 miles during my head swap with new stock lifters. They look like they were redesigned from the original lifters. The roller area is fully enclosed on the new ones.