Bigger valves, larger valve seat needed??
05-29-2006, 08:40 AM
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Bigger valves, larger valve seat needed?? Going with the LS1 style 2.00" intake valves on my 5.3L 862 Heads, which came with 1.89" valves. And a port job too.
My question is do I need to go with larger valve seats?
And does anyone have a set of intake valves for sale?
My question is do I need to go with larger valve seats?
And does anyone have a set of intake valves for sale?
05-29-2006, 04:26 PM
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Originally Posted by itchygomey98
Nope, 2 inchers will fit in the stock seats. New manley valves are 200 bucks for all intake and exhaust valves.
Check the sponsors.
Check the sponsors.
Anyone have a set of Intake valves for sale??
Originally Posted by Nine Ball
2.02" Intake, 1.55" Exhaust valves fit on stock seats. Larger seats are required for bigger than those.
From http://www.automotiverebuilder.com/ar/eb040538.htm
The exhaust valves are all the same size (1.55?), but the intakes came in two different sizes. The 4.8L and 5.3L engines used 1.890? intake valves, while the 6.0L, LS1 and LS6 5.7L engines used 2.00? intake valves
The exhaust valves are all the same size (1.55?), but the intakes came in two different sizes. The 4.8L and 5.3L engines used 1.890? intake valves, while the 6.0L, LS1 and LS6 5.7L engines used 2.00? intake valves
I am going with 5.3/4.8 862 heads for CR and a mild port and larger valves to get better flow than the stock 317's.
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05-29-2006, 07:16 PM
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the valve seats themselves are only 2.02 so the biggest valve job you can really put on them is a 2.00. But that being said you can still run a 2.02 valve on a 2.00 valve job. But you can get more than enough flow out of a 2.00 valve on a ls1 or a 5.3 head.
05-29-2006, 07:28 PM
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Originally Posted by JZ'sTA
Stock seats are fine, many companies use a 2.04 with stock seats.
Brandon
05-29-2006, 07:43 PM
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What exactly is the stock LS1/LS6 size? I read it was a 2.00
And have any for sale??
And have any for sale??
From http://www.automotiverebuilder.com/ar/eb040538.htm
The exhaust valves are all the same size (1.55?), but the intakes came in two different sizes. The 4.8L and 5.3L engines used 1.890? intake valves, while the 6.0L, LS1 and LS6 5.7L engines used 2.00? intake valves
The exhaust valves are all the same size (1.55?), but the intakes came in two different sizes. The 4.8L and 5.3L engines used 1.890? intake valves, while the 6.0L, LS1 and LS6 5.7L engines used 2.00? intake valves
05-29-2006, 08:08 PM
#13
Originally Posted by xfactor_pitbulls
Thats pushing it, you dont get much surface to seal with. Either run a 2.02, or put in the new seat and run a 2.05+ A 1.60 on the exhaust side is fine all day long.
Brandon
Brandon
I hear ya. But some companies do it. Hell Absolute speed used to do a 2.055 intake valve on a stock seat.
I found that out the hard way.
05-30-2006, 12:04 AM
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Originally Posted by git_sum
you'd should look for a set of ls6 valves, they're a little lighter weight. Would be a little better valve.
There was a set on eBay I just missed
05-30-2006, 06:43 PM
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Originally Posted by Studytime
Am I really seing this correctly? For clarification, if I had a set of 862s with a full-radiused valve job on the stock seat, you could just simply add a set of 2.02 and 1.60" valves? Would there be any advantage to adding a larger seat, if the stock seat was blended into the bowl?
Ben T.
Ben T.
05-31-2006, 09:25 AM
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Originally Posted by 04BlackSilverado
Anyone answer this??
06-01-2006, 10:11 PM
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O.k, I just looked, I do have a complete set of valves from an 00 camaro. The gunk and crap is cleaned up off them, and they came out of an 30xxx something car. Anyone want? PM ME.