lifters?

[ericjon262]

How much interest is there in a higher performance lifter for these engines?

I'm working on my 3.9L build and am trying to get to 8500 RPM with roller hydraulics. I was going to buy a CTS-V lifter with the ceramic ball checks etc.. and see if I can design some guts for the stock lifters that'll work...

With that said, how much interest is there in a higher RPM lifter?


One of my machinists could make me whatever parts I need for an internal swap.

From what I've determined so far matching leak down rates is the harder part especially on used lifters. Anyone have a leak down rig already?

CTS-V uses the same lifters as all other LSx motors, and they're known to go to about 7500 rpms. I know I'm probably about to get laughed at, but what about a "rev kit" kinda like the AFR Hydra-rev? if you have a spring apply pressure to just the lifter body, and not the plunger, you'll take some load off the valvesprings, which would allow to reduce seat pressure, and reduce the the distance the plunger in the lifter actuates.

here's a pic pf the hydra-rev before pushrod installation

http://www.firebirdnation.com/forums/uploads/1211845880/gallery_7_822_1172.jpg

http://www.jegs.com/i/AFR-Airflow-Research/033/6150/10002/-1?parentProductId=

[NateD4]

How much interest is there in a higher performance lifter for these engines?

I'm working on my 3.9L build and am trying to get to 8500 RPM with roller hydraulics. I was going to buy a CTS-V lifter with the ceramic ball checks etc.. and see if I can design some guts for the stock lifters that'll work...

With that said, how much interest is there in a higher RPM lifter?

One of my machinists could make me whatever parts I need for an internal swap.

From what I've determined so far matching leak down rates is the harder part especially on used lifters. Anyone have a leak down rig already?

[ericjon262]

if anyone wants to throw a coupl ebucks towards research, we can find out on my 3500!

[ericjon262]

All GM motors use 0.842" diameter lifters. Some Oldsmobile engines had huge 0.921" lifters, which is bigger than Mopar lifters which are often regarded as the classic engines with big lifters that are able to support aggressive cams. Of course this doesn't matter any more since roller cams are the norm.

So if you have the time you may be able to track down a roller lifter that will drop in and either offer better performance through a hydraulic lifter or switch to a solid lifter.

One interesting upgrade might be to see if new GM Ceramic Check Ball lifter guts could be retrofitted into 660 roller lifters. These lifters offer performance over 7000RPM LS motors.

that might be an interesting one to check...

http://www.texas-speed.com/p-309-gm-replacement-ls7-lifters.aspx

[geoffinbc]

All GM motors use 0.842" diameter lifters. Some Oldsmobile engines had huge 0.921" lifters, which is bigger than Mopar lifters which are often regarded as the classic engines with big lifters that are able to support aggressive cams. Of course this doesn't matter any more since roller cams are the norm.

So if you have the time you may be able to track down a roller lifter that will drop in and either offer better performance through a hydraulic lifter or switch to a solid lifter.

One interesting upgrade might be to see if new GM Ceramic Check Ball lifter guts could be retrofitted into 660 roller lifters. These lifters offer performance over 7000RPM LS motors.

[Superdave]

I'd post up the measurements but about a few weeks ago i threw out all my extra lifter parts.

[ForcedFirebird]

Are you sure its gonna fit the hole? I can't believe after 10+ years of doing this shit, I wouldn't know that the SBC lifters work for these engines.

I believe I said that to you after replying to this thread, but didn't want to give false info. We knew the ltx and lsx were not drop in since we use the guts to improve the 660 roller lifters and was sure the length/oiling was different but figured the info would come through.

The cam bores in the block and the lifter bores match SBC, I use a SBC tool to install cam bearings and know the BBC lifters can work in a 660 when honed to size. The midget racers use BBC lifters, rocker arms and push-rods in their cars. Know that stuff needs block/head modifications, but wasn't 100% on the SBC stuff.

[bob442]

Just throw in stock good lifters, and be done with it. I'm speaking from experiance.
If your sticking with stock rockers, go get a set of 10 MM and drill and tap for them while the heads are out of the block.

[ericjon262]

Yep, same lifter bore.

I dropped some LT-1 lifters into mine to check out the oiling. Not going to work. They're too tall and the oiling hole lifts out past the block.

interestingly enough, the lifters I have are LT1 lifters...

do the guts from the lifters fit each other? I've got a set of comp "magnum" lifters that I was going to use on my LT1 that are now collecting dust...

[pocket-rocket]

Bench grinder time

Sent from my HTC One X using Tapatalk 2

[Superdave]

Yep, same lifter bore.

I dropped some LT-1 lifters into mine to check out the oiling. Not going to work. They're too tall and the oiling hole lifts out past the block.

[SappySE107]

Are you sure its gonna fit the hole? I can't believe after 10+ years of doing this shit, I wouldn't know that the SBC lifters work for these engines.

[geoffinbc]

The OD is the standard Chevy 0.842. So a small block lifter will fit the hole but you need to determine how the oil band will interface with the oil galley and lifter bore limits. You also need to ensure the anti rotation device is compatible.

[ericjon262]

10-4, I'll measure them when I pull them for my cam swap and post up my findings.

[SappySE107]

Bore is different, and possibly the length.