valve size :)

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Jul 6, 2010 | 02:08 PM

mattyj385

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From: Fredericksburg, Virginia

valve size :)

hey LT1 owners! whats the biggest size valves you are running in your stock heads?

Jul 6, 2010 | 02:24 PM

RamAir95TA

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From: South Jersey

I don't see the point in running a monster valve, but 2.02/1.6 is about as big as you want to go without shrouding.

Jul 6, 2010 | 02:44 PM

mattyj385

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thanks for the info brother, the reason i was asking is cause im gonna do a 385 build

Jul 6, 2010 | 02:45 PM

RamAir95TA

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Displacement doesn't determine valve size.

Jul 6, 2010 | 08:15 PM

96capricemgr

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To properly use 2.02/1.6 you need new seats which is money pissed in the wind. The bench racers will tell you it is worth it but when you look at the best running cars you will see smaller valves than that. Not that smaller valves are necessarily better just blindly going big as possible is wasted effort.

Jul 6, 2010 | 09:15 PM

Speedy

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Agree 96. 2.00/1.56 is best for stock heads. It only requires a cheap 3-angle and a bowl cut. You can port them and get decent numbers. After that, AFR heads are a good step up.

Jul 6, 2010 | 11:30 PM

Wicked94Z

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Quote:

Originally Posted by RamAir95TA

Displacement doesn't determine valve size.

displacement and rpm requirement definitely determine valve size and csa required. csa and valve size go hand in hand, so it depends what you're trying to do with the heads. a hollow lt4 intake valve will probably be fine for your average 383, less weight too!