Lash cap for lt1 and lt4?

shinysun · 04-05-2018, 07:24 AM

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I got the cam fuel lobed 32% and lash cap for the pump.
And it said like the pic the above.

Should I use the different lash cap btw lt1 and lt4 pump?
I thought the lt4 and lt1 pump are exchangable without any lash caps.

parish8 · 04-05-2018, 10:54 AM

Here is a post from another thread

“I have a little more info to add. I now have a 32%+ cam lobe and a lt4 pump. my testing shows the same results as that corvette thread on the subject.

without lash cap there is no preload and it does not bottom out the pump

with the .080 lash cap there is about .050 preload and it does bottom out the pump about .010 before the pump is seated without the gasket. looks like I either need to take a little off that lash cap or buy the .060 one mentioned in the corvette thread.”

I ended up just sanding and then polishing the lash cap they gave me until it didn’t bottom out. I think I took about .020 off. You could also order a .060 lash cap. You Don’t want to run nothing, it will not have preload and you will be giving up some stroke. Read up on how to test for preload and pump bottoming and confirm both on your set up.

boostednut · 04-05-2018, 01:12 PM

There's a thread going over how to install a lash cap, and you need a tool to make sure the preload is set right. I would follow that. Basically outlines what parish said.

SS Camaro Freak · 04-05-2018, 03:35 PM

Great How to:

https://www.corvetteforum.com/forums...learances.html

shinysun · 04-05-2018, 04:00 PM

Thank you for the advise!

parish8 · 04-05-2018, 08:21 PM

you dont need that tool but you do need something to measure so you know when the cam is at the top and bottom of the lobe. I used a dial indicator I got from harbor freight a few years back.

Atomic Ed · 04-06-2018, 01:55 PM

My research tells me that there is no canned answer. You have to do the measurements for each setup, regardless of vendor labeling, if you are thinking about a lash cap. There seems to be enough variation that using a rule of thumb won't work.

Like Parish8 said, you don't need the tool, just something to determine top and bottom of the cam lobe stroke.

boostednut · 04-06-2018, 03:08 PM

Good stuff guys. More threads like this is what the forum needs. Simple straight forward answers

04-05-2018, 07:24 AM	#1
shinysun Drives: 2016 Camaro SS Join Date: Jul 2016 Location: Korea Posts: 417	Lash cap for lt1 and lt4? I got the cam fuel lobed 32% and lash cap for the pump. And it said like the pic the above. Should I use the different lash cap btw lt1 and lt4 pump? I thought the lt4 and lt1 pump are exchangable without any lash caps.

04-05-2018, 10:54 AM	#2
parish8 Drives: 17 SS a8 Join Date: Feb 2010 Location: omaha Posts: 1,678	Here is a post from another thread “I have a little more info to add. I now have a 32%+ cam lobe and a lt4 pump. my testing shows the same results as that corvette thread on the subject. without lash cap there is no preload and it does not bottom out the pump with the .080 lash cap there is about .050 preload and it does bottom out the pump about .010 before the pump is seated without the gasket. looks like I either need to take a little off that lash cap or buy the .060 one mentioned in the corvette thread.” I ended up just sanding and then polishing the lash cap they gave me until it didn’t bottom out. I think I took about .020 off. You could also order a .060 lash cap. You Don’t want to run nothing, it will not have preload and you will be giving up some stroke. Read up on how to test for preload and pump bottoming and confirm both on your set up. __________________ dropped a valve in the 6.2. now running a drop in rods and piston 5.3 best et 5.83@121 with the 5.3 http://www.camaro6.com/forums/showthread.php?t=465472

04-05-2018, 08:21 PM	#6
parish8 Drives: 17 SS a8 Join Date: Feb 2010 Location: omaha Posts: 1,678	you dont need that tool but you do need something to measure so you know when the cam is at the top and bottom of the lobe. I used a dial indicator I got from harbor freight a few years back. __________________ dropped a valve in the 6.2. now running a drop in rods and piston 5.3 best et 5.83@121 with the 5.3 http://www.camaro6.com/forums/showthread.php?t=465472

04-05-2018, 01:12 PM	#3
boostednut Drives: Nothing cool atm Join Date: Aug 2017 Location: California Posts: 138	There's a thread going over how to install a lash cap, and you need a tool to make sure the preload is set right. I would follow that. Basically outlines what parish said.

04-05-2018, 03:35 PM	#4
SS Camaro Freak Drives: 2016 Gen 6 SS 6spd Join Date: Jun 2017 Location: NC Posts: 46	Great How to: https://www.corvetteforum.com/forums...learances.html

04-05-2018, 04:00 PM	#5
shinysun Drives: 2016 Camaro SS Join Date: Jul 2016 Location: Korea Posts: 417	Thank you for the advise!

04-06-2018, 01:55 PM	#7
Atomic Ed Drives: 2001 Audi TT, 2016 Camaro Join Date: May 2016 Location: Eastern Washington Posts: 833	My research tells me that there is no canned answer. You have to do the measurements for each setup, regardless of vendor labeling, if you are thinking about a lash cap. There seems to be enough variation that using a rule of thumb won't work. Like Parish8 said, you don't need the tool, just something to determine top and bottom of the cam lobe stroke.

04-06-2018, 03:08 PM	#8
boostednut Drives: Nothing cool atm Join Date: Aug 2017 Location: California Posts: 138	Good stuff guys. More threads like this is what the forum needs. Simple straight forward answers

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