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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

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Old Mar 12, 2009 | 06:53 PM
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Default Best Valves
What is the best valves to put in lt1 heads the castings are 561 ? Also what is the biggest ? Thanks to anyone with info
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Old Mar 12, 2009 | 07:00 PM
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Manley Stainless Pro-Flo Valves 2.00" Int/1.56" Exh
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Old Mar 12, 2009 | 07:01 PM
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There is some guy selling some 1.94/1.56 on here would they work as well
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Old Mar 12, 2009 | 07:04 PM
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opps there 1.94/1.60
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Old Mar 12, 2009 | 07:05 PM
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Originally Posted by madmike9396
There is some guy selling some 1.94/1.56 on here would they work as well

That is the stock intake size.


Real question should maybe be how do you define best?

Could mean lightest, strongest, best flow, most heat resistant, good at all but great at none making it a good balanced value????
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Old Mar 12, 2009 | 07:16 PM
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All of the above strongest,lightest,best flow etc..... So 1.94/1.56 is stock size ?
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Old Mar 12, 2009 | 07:25 PM
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Stock exhaust valve size is 1.50".
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Old Mar 12, 2009 | 07:29 PM
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So stock is 1.94/1.50 ? Im mixed up hopefully this is correct
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Old Mar 12, 2009 | 07:32 PM
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Originally Posted by madmike9396
So stock is 1.94/1.50 ? Im mixed up hopefully this is correct
Yeah.
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Old Mar 12, 2009 | 07:47 PM
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I'm using 2.02 / 1/60 Manley SS valves. Lots o' breathing, very fine quality valves.
Last edited by koolaid_kid; Mar 13, 2009 at 07:59 AM.
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Old Mar 12, 2009 | 07:56 PM
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Originally Posted by koolaid_kid
I'm using 2.02 / 1/60 Stanley SS valves. Lots o' breathing, very fine quality valves.
i didnt think you could go that big
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Old Mar 12, 2009 | 07:57 PM
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Originally Posted by madmike9396
i didnt think you could go that big
You can, but you need to machine the valve seats.
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Old Mar 12, 2009 | 08:05 PM
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im thinking 2.00/1.60 What yall think ? idk thats why im asking
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Old Mar 12, 2009 | 08:06 PM
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That'll be fine.
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Old Mar 12, 2009 | 08:08 PM
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Would the seats need to be machined ?
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Old Mar 12, 2009 | 08:14 PM
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At the very least, if you're installing bigger valves, you need to have a valve job done to support the flow of the newer valves. In short, yes.
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Old Mar 12, 2009 | 08:15 PM
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With some work having to be done, you can use ls1 valves. They are 30percent or more lighter that lt1 valves. They are stock size, but keeping valve train weight down can pay big dividends, this is what I'll be doing come time to port and rebuild my heads.


hth

andy schuck
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Old Mar 12, 2009 | 08:20 PM
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Seems like a good idea






Originally Posted by andysc
With some work having to be done, you can use ls1 valves. They are 30percent or more lighter that lt1 valves. They are stock size, but keeping valve train weight down can pay big dividends, this is what I'll be doing come time to port and rebuild my heads.


hth

andy schuck
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Old Mar 12, 2009 | 11:38 PM
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Originally Posted by andysc
With some work having to be done, you can use ls1 valves. They are 30percent or more lighter that lt1 valves. They are stock size, but keeping valve train weight down can pay big dividends, this is what I'll be doing come time to port and rebuild my heads.


hth

andy schuck
Interesting, never heard of that before.
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Old Mar 13, 2009 | 07:14 AM
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whether LS valves are lighter depends on the valves being choosen, a blanket statement doesn't really work.

I would not be so quick to assume a 1.600 valve will fit the seat, dig a little further before commiting to anything.
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