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Max valve lift possible without machining in LS1

Old 03-28-2003, 07:32 AM
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Default 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.
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Old 03-29-2003, 12:54 AM
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Default Re: Max valve lift possible without machining in LS1

TTT , good question
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Old 03-31-2003, 03:03 AM
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Default Re: Max valve lift possible without machining in LS1

Can anyone help me in my quest? A simple answer will do.
And what does TTT mean?

Tom.
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Old 03-31-2003, 03:16 AM
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Default 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.
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Old 03-31-2003, 03:51 AM
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Default 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
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Old 03-31-2003, 09:27 AM
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Default Re: Max valve lift possible without machining in LS1

Thankyou guys.
They're just the answers I was looking for. A cam slide is what I'm going for.
Cheers,
Tom.
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Old 03-31-2003, 10:06 AM
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Default 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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Old 04-01-2003, 12:11 PM
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Default 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.
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Old 01-08-2016, 04:52 PM
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I run a cam with intake at 219 dur at .050 and .607 lift and exhaust at 227 dur at .050 and .614 lift on 112 lsa with flat tops and 243 heads no milling and I have good room.
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Old 01-08-2016, 05:09 PM
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Originally Posted by Dekmk21 View Post
I run a cam with intake at 219 dur at .050 and .607 lift and exhaust at 227 dur at .050 and .614 lift on 112 lsa with flat tops and 243 heads no milling and I have good room.
Fantastic. I'm sure T70 has gotten his answer in the past 12 years since this thread was started.
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Old 01-08-2016, 05:19 PM
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Originally Posted by redtan View Post
Fantastic. I'm sure T70 has gotten his answer in the past 12 years since this thread was started.
I.....almost.....choked.....from.....laughing..... so.....hard!

Nothing says "not paying attention" like responding to a 12 1/2 year-old thread.

That's gotta be a record !

KW
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Old 01-08-2016, 07:03 PM
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Originally Posted by KW Baraka View Post
I.....almost.....choked.....from.....laughing..... so.....hard! Nothing says "not paying attention" like responding to a 12 1/2 year-old thread. That's gotta be a record ! KW
Nope in December, someone did a 14 year old thread. Two of them actually.
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