Max valve lift possible without machining in LS1
Thread Starter
Teching In
Joined: Mar 2003
Posts: 9
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From: UK
Max valve lift possible without machining in LS1 Hi Guys,
Can anyone tell me the max valve lift available in my LS1 before I have to machine the pistons.
I have some 1.8 ratio roller rockers which I want to use and I will get some decent springs.
But I'd like to get hold of the cam before I pull the engine to save time. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Advice and suggestions welcomed.
Tom.
Can anyone tell me the max valve lift available in my LS1 before I have to machine the pistons.
I have some 1.8 ratio roller rockers which I want to use and I will get some decent springs.
But I'd like to get hold of the cam before I pull the engine to save time. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Advice and suggestions welcomed.
Tom.
TECH Resident
Joined: May 2002
Posts: 829
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From: Fremont, CA
Re: Max valve lift possible without machining in LS1 Well im running an ASA hot cam, with 1.85 ratio rockers on an otherwise stock LS1. Cam specs are 226/236 .525/.525 110lsa, with the 1.85 rockers, the lift should be around .573 or so. I hope this helps.
Re: Max valve lift possible without machining in LS1 Tom, wether or not you're going to mill the heads will make a BIG difference on how much lift you can run.
If you're just planning on a cam slide, and leaving the heads in place then you have plenty of room. Anything .600 lift or below will clear fine with stock pistons and COMPLETELY stock heads. I've seen cars run well with lift #'s upwards of .580 and .045 off the heads, so you definately have plenty of room with stock unmilled heads. Good luck...
Josh
If you're just planning on a cam slide, and leaving the heads in place then you have plenty of room. Anything .600 lift or below will clear fine with stock pistons and COMPLETELY stock heads. I've seen cars run well with lift #'s upwards of .580 and .045 off the heads, so you definately have plenty of room with stock unmilled heads. Good luck...
Josh
Re: Max valve lift possible without machining in LS1 Duration plays a big part on P/V clearence.I would say a Cam with .520 lift and under 232 duration will work with your setup without milling the Heads.
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Thread Starter
Teching In
Joined: Mar 2003
Posts: 9
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From: UK
Re: Max valve lift possible without machining in LS1 Thanks again.
So are we saying that the 2002 (0.550) will work with the 1.8 rockers (0.582 total lift, 218 ex.) without the need for piston milling?
The duration will be unaffected, so in theory, as long as the lift will clear the pistons, and the springs are upto the job, there should be no problem, right??!!
I am not prepared to pull the engine apart so if anyone knows of a really nice cam, not too lumpy, which will work well with my 1.8 rockers, let me know.
Cheers,
Tom.
So are we saying that the 2002 (0.550) will work with the 1.8 rockers (0.582 total lift, 218 ex.) without the need for piston milling?
The duration will be unaffected, so in theory, as long as the lift will clear the pistons, and the springs are upto the job, there should be no problem, right??!!
I am not prepared to pull the engine apart so if anyone knows of a really nice cam, not too lumpy, which will work well with my 1.8 rockers, let me know.
Cheers,
Tom.
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Fantastic. I'm sure T70 has gotten his answer in the past 12 years since this thread was started.
Nothing says "not paying attention" like responding to a 12 1/2 year-old thread.
That's gotta be a record
!KW
Teching In
Joined: Nov 2019
Posts: 16
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Hey guys im trying to bring this back from the dead i have a 04 gto m6 and i have stock 241 heads and went and bought a 228r cam with .600 lift 112 lsa .660 valve springs 7.4 push rods and bought cosmetic .045 head gaskets . Anyone have a similar build or experience here should i have cleareance issues ?? I had someone put a link on how to measure for clearance but lost it.
Thanks again.
So are we saying that the 2002 (0.550) will work with the 1.8 rockers (0.582 total lift, 218 ex.) without the need for piston milling?
The duration will be unaffected, so in theory, as long as the lift will clear the pistons, and the springs are upto the job, there should be no problem, right??!!
I am not prepared to pull the engine apart so if anyone knows of a really nice cam, not too lumpy, which will work well with my 1.8 rockers, let me know.
Cheers,
Tom.
So are we saying that the 2002 (0.550) will work with the 1.8 rockers (0.582 total lift, 218 ex.) without the need for piston milling?
The duration will be unaffected, so in theory, as long as the lift will clear the pistons, and the springs are upto the job, there should be no problem, right??!!
I am not prepared to pull the engine apart so if anyone knows of a really nice cam, not too lumpy, which will work well with my 1.8 rockers, let me know.
Cheers,
Tom.
Hey guys im trying to bring this back from the dead i have a 04 gto m6 and i have stock 241 heads and went and bought a 228r cam with .600 lift 112 lsa .660 valve springs 7.4 push rods and bought cosmetic .045 head gaskets . Anyone have a similar build or experience here should i have cleareance issues ?? I had someone put a link on how to measure for clearance but lost it.
Assemble the valvetrain so the checker springs are in place, rocker arm and pushrod installed. turn the crank until it is around 5-15 degrees BTC or ATC, depending on which valve you are checking, and set up the dial indicator on top of the rocker tip, or retainer close to the stem, and set it to 0. Check the PTV clearance by pressing down on the valve until it meets the piston.
At least it's something like that. You will have to turn the crank slightly around that degree range and repeat the procedure untill you find the smallest measurement.
Then you need to flycut your pistons. There are also threads here that show how you can do this yourself.
TECH Junkie
Joined: Nov 2013
Posts: 3,913
Likes: 366
From: White Bear, Mn
Measuring PtV
https://ls1tech.com/forums/generatio...ve-method.html
https://ls1tech.com/forums/generatio...ve-method.html
Although i would think using feeler guages would be more accurate. They make them as thick .050" maybe thicker...
