Valve Questions
Thread Starter
Teching In
Joined: Dec 2001
Posts: 19
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From: Little Rock, AR
Valve Questions I am looking at putting bigger valves in my heads and getting them ported. Most of the vehicles I work with here lately are DSMs. Well the questions I have are what Length valves come out of a LS1 head? Are they the same as older gm heads? How big of a valve can I go without changing the valve seat? What brand of valves are you people running? Just a few questions I had thanks for the help and if you can give me any other tips or pointers on them let me know. I don't plan on having anyone build the heads except for at our shop.
Thanks
Bryan
Thanks
Bryan
Re: Valve Questions The LS1 valves are unique, not like the other Small Block Chevy motors, including the LT1.
First of all, they are a metric stem, 11mm if I remember correctly. Can't recall the length (damn hangover! hah)
You can move up to a 2.02" on the intake, and a 1.55" on the exhaust valve and keep the stock seats. This is what most stage 1 heads have.
Brands? Ferrea is pretty popular.
Tony
First of all, they are a metric stem, 11mm if I remember correctly. Can't recall the length (damn hangover! hah)
You can move up to a 2.02" on the intake, and a 1.55" on the exhaust valve and keep the stock seats. This is what most stage 1 heads have.
Brands? Ferrea is pretty popular.
Tony
Re: Valve Questions [quote]Originally posted by Nine Ball:
<strong>...First of all, they are a metric stem, 11mm if I remember correctly. Can't recall the length (damn hangover! hah)
You can move up to a 2.02" on the intake, and a 1.55" on the exhaust valve and keep the stock seats...</strong><hr></blockquote>
I'm pretty sure the valve stems are 8 mm. The stock intake is 2.00", but isn't the exhaust already 1.55"?
<strong>...First of all, they are a metric stem, 11mm if I remember correctly. Can't recall the length (damn hangover! hah)
You can move up to a 2.02" on the intake, and a 1.55" on the exhaust valve and keep the stock seats...</strong><hr></blockquote>
I'm pretty sure the valve stems are 8 mm. The stock intake is 2.00", but isn't the exhaust already 1.55"?
Launching!
Joined: Dec 2001
Posts: 291
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From: Houston
Re: Valve Questions I was tring to figuer out how you guys do that quote thing.... but you are right. The size is 8mm. steam and 7mm locks. Stock sizes are 2.0 intake 1.55 Exuast. you can go to 2.02 Intake and 1.56 exaust with stock seats.
[ December 29, 2001: Message edited by: One Monkey ]</p>
[ December 29, 2001: Message edited by: One Monkey ]</p>
I can shift faster than you.
iTrader: (21)
Joined: Nov 2001
Posts: 5,133
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From: Baton Rouge, LA
Re: Valve Questions [quote]Originally posted by TA2SLOW:
<strong>I'm pretty sure you can go up to 1.57 exhuast valve since the stock size is 1.55 inches.</strong><hr></blockquote>
Like they said above, they are 8mm valves. Stock valve size is 2.00/1.55 and you can fit a 2.02/1.57 in the stock seats.
<strong>I'm pretty sure you can go up to 1.57 exhuast valve since the stock size is 1.55 inches.</strong><hr></blockquote>
Like they said above, they are 8mm valves. Stock valve size is 2.00/1.55 and you can fit a 2.02/1.57 in the stock seats.
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