Lifter question differences in LS7 and GMPP short something

[EDFHOBBIES]

Just wondering if any one can explain the difference in the LS7 and the GMPP lifter that are called short travel I believe found in certain vehicles like the ct-vs

Any benefits?
Do the pushrods length staying the same?
Are any less prone to sticking?

my build will be the following..

LS3 block 416 motor
LS3 CNC GMPP Heads
LS3 intake and stock TB
AGP twin turbo kit
BTR CAM I may reused my POS stage 3 or get there twin turbo cam

[HaveBlue]

In a nutshell, short travel lifters reduce the travel of the internal piston to reduce pump up at higher rpms. A pumped up lifter can hang a valve open. Another benefit is using a shorter pushrod for less flex. Pushrod length should be determined with a pushrod length checking tool, on your assembled engine, to keep proper valve train geometry.

A bigger challenge on your 416 build is the piston skirt being pulled partially out of the cylinder, then being slammed back up into the cylinder. Do your research and pick the components carefully.

[Unreal]

GMPP lifters are not short travel. They have a ceramic check ball for high RPM use. I would strongly look at the Johnson lifters or Morels.

[vroomapunk]

Originally Posted by Unreal

GMPP lifters are not short travel. They have a ceramic check ball for high RPM use. I would strongly look at the Johnson lifters or Morels.

Right, I have the Johnson Slow Leakdown lifters



all the vendors/shops Ive talked to said that they are an improvement over stock. Think they were $450? or something along those lines

[Bodywerks]

Pushrod measurements would NOT be the same, if you are talking about the Johnson 2110's. Optimal preload for them is .04+/- .01, whereas ls7 lifters run as high as .080".
Ideally, you want .035" on the 2110's. This is per the Johnson lead engineer. Less preload makes for more valvetrain noise but better high rpm stability, and less likely to smack valves on an over revv.

[vroomapunk]

Originally Posted by Bodywerks

Pushrod measurements would NOT be the same, if you are talking about the Johnson 2110's. Optimal preload for them is .04+/- .01, whereas ls7 lifters run as high as .080".
Ideally, you want .035" on the 2110's. This is per the Johnson lead engineer. Less preload makes for more valvetrain noise but better high rpm stability, and less likely to smack valves on an over revv.

hmm, BTR told me measurements would be the same, and yes, for 2110's

So, crap, guess I need to re-measure since I switched to johnsons.

[HaveBlue]

At SEMA Comp Cams announced their Short Travel XD Hyd Roller Lifter.
Here is a graphic from their brochure (it's on their website).

Features: tool steel pushrod seat,. reduced oil volume in high-pressure chamber
polished wheels & micro-sorted precision ground needle bearings.

The display parts appeared to be DLC coated, but no one would confirm that or whether it would be on the production pieces.

[Bodywerks]

Originally Posted by vroomapunk

hmm, BTR told me measurements would be the same, and yes, for 2110's

So, crap, guess I need to re-measure since I switched to johnsons.

His name is Randy vrooman, and this is what he had to say about valvetrain setup and the Johnson 2110's. I'd provide the link but don't want to violate rules. You can Google 'Johnson 2110 preload' and and look for threads on ls1tech. He is Havoc40 there:
Havoc40*, 02-01-2015 01:28 PM

"When I set up a valvetrain, I measure pushrod lengths for every valve regardless if it's a short travel or full travel lifter. This allows me to achieve the exact preload I'm shooting for on all 16 lifters. Overkill? Maybe. But it's peace of mind for me and I've had great results. The engines I set-up with 2110's get .035" preload. This will account for thermal expansion and still keep things quiet. I've mentioned this before on here...I'm not a fan of deep preloads in search for a "quieter" valvetrain. When things get excited, you don't want that extra preload causing clearance issues with valves and pistons.*

I typically tell people with 2110's to set preload @ .040" +/- .010". The same goes for the 2110R that has .045" less travel than the standard 2110's."

[vroomapunk]

Originally Posted by Bodywerks

His name is Randy vrooman, and this is what he had to say about valvetrain setup and the Johnson 2110's. I'd provide the link but don't want to violate rules. You can Google 'Johnson 2110 preload' and and look for threads on ls1tech. He is Havoc40 there:
Havoc40*, 02-01-2015 01:28 PM

"When I set up a valvetrain, I measure pushrod lengths for every valve regardless if it's a short travel or full travel lifter. This allows me to achieve the exact preload I'm shooting for on all 16 lifters. Overkill? Maybe. But it's peace of mind for me and I've had great results. The engines I set-up with 2110's get .035" preload. This will account for thermal expansion and still keep things quiet. I've mentioned this before on here...I'm not a fan of deep preloads in search for a "quieter" valvetrain. When things get excited, you don't want that extra preload causing clearance issues with valves and pistons.*

I typically tell people with 2110's to set preload @ .040" +/- .010". The same goes for the 2110R that has .045" less travel than the standard 2110's."

Thanks man! My car is actually at Futral Motorsports now getting some trans work done, im gonna have them check while its there.

I appreciate it!