showdog75

iTrader: (8)

What's the forum consensus on these lifters? Seems these will be available before the limited travel lifters will be. Overkill for a h/c/I build? Or not

G Atsma

Short travel lifters are much tougher to get set up right, as you need to measure EACH pushrod for correct length, due to the very short travel clearance of the lifter.
You can be up or down quite a bit on length with normal travel lifters, like by .010-.020. Not with these.

lazerlemonta

I have them in my mild LS3 build. Do you intend on using adjustable rockers? If not, I cut my rails into pairs and shimmed each set of rockers individually to achieve proper preload. I had 6 different lengths made and made them all .010 long to allow for shimming. Your idle oil pressure will be lower than normal due to the axle oiling just FYI

JRFed

We're using them on some H/C projects.

showdog75

iTrader: (8)

I can get these sooner than the regular limited travel lifters so I think I'll take the plunge. I already have super high oil pressure so I'm good if I lose a bit at idle. Lazer what rails are you referring to?

lazerlemonta

The stock rails the rockers sit on that run the entire length. I cut them into 4 pairs per head to allow a more precise measuring of preload.

showdog75

iTrader: (8)

I thought that's what you meant. Sounds like a good idea as I'm not gonna use adjustable rockers. Thanks

Darth_V8r

iTrader: (4)

Overkill is a matter of opinion. I ran them on a LS1 HCI set up until I went for solids. I was very happy with them. Properly set up, they are worth some power over the regular stock lifters.

DavidBoren

Wait... there are people that DON'T measure every pushrod, every time?

Darth_V8r

iTrader: (4)

News to me too

G Atsma

(cue Jon Lovitz voice..) Uhhh... sure they do! Yeah.... I put that there JUST IN CASE someone (surely NONE of us...) MIGHT not see the need to do so... yeah...THAT'S the ticket....

Jimbo1367

Isn’t this the lifter GM puts on their COPO engines?

joyridin'

iTrader: (1)

I was told they do not use the short travel, but they said they use the 2126LSR and run to 8800 RPM.

Bob570

I'm fairly certain they use the Johnson 2110

Bspeck82

I use the 2116 short travels and they work well. Using the comp pushrod tool I took my measurements and called manton and johnson and discovered that those measurements at gauge length needed to be slightly modified to get my true total. I measure a few exhaust and a few intakes, not all, the ones measured are the same as they should be. I'd be concerned if i had 16 different pushrod lengths. But my heads and block are also flat. Had kelly Bluebaugh make sure of that. They arent very loud at all and rev limiter set to ~7500 no float. Works well and makes great power.

Edit: 2116 "reduced travels"

lazerlemonta

The pre load in yours compared to the short travels are night and day. You need to measure every push rod for short travels. you only have .035 +/- .005. I believe yours have .090 (not looking it up) so you dont have to be so exact if you choose to not be precise.

Bspeck82

the tolerances I was given are .040 +- .010

rednari2

iTrader: (1)

You should measure all the sticks. But, this doesn't mean you should have 5 or 6 different sizes. If the sticks vary .005 or so, the lifter will take it up. If the sticks vary too much, the problem is in the valve lengths. If the valve lengths are within .002-003, one set of sticks should work. Do not experiment with different stick lengths to compensate for a bad valve job. A uniform set of sticks should work.

lazerlemonta

Key word is should.... The variances can come in many parts of the valvetrain. Cam, lifters, valves and rockers let alone push rod tolerance. I guess if your dealing with LS7 lifters you throw what ever you want in. Short travels you better do your homework and measure each and every one. You basically spend the effort of setting up a solid. Not trying to be argumentative, but a statement of a "uniform set of sticks should work" in my opinion is from someone that has not set up many top ends with precise measuring.

Darth_V8r

iTrader: (4)

I have seen all kinds of crap with the short travels. Basically lazer nailed it. I helped a guy over the phone just this week and he ended up every pushrod was within .003. All 16. Difference is he had a single pattern cam. Intake and exhaust lift were the same. You do the typical .025 lift reduction on the exhaust side, then on short travels that will mean minimum two different sizes. Measure them all and see what you got. Then group them together by close sizes. Figure when you get them back they will be +/- .003, which allows you to match them back up. Typically I see one bastard length either long or short. No idea why but it always seems to happen. Here is how mine went:



I checked the 6.686 at least ten times. I ended up ordering a group at 6.642, a group at 6.661, a group at 6.635, and one 6.686.

It is not a matter of what you should get, it is a matter of making damn sure of knowing what you actually need and ordering that.