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Do i need to buy aftermarket vavles to rev up 9k?

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Old May 9, 2002 | 08:53 AM
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Default Do i need to buy aftermarket vavles to rev up 9k?

im currently building up my motor. im purchasing all new vavlespings, retainers. head is getting a portflow job. higer compression pistons. is it necessary to upgrade to better vavles? the head im using for this is a first gen B16 head.


any tips u can give me will be great. TIA

btw, anyone know how much a set of B16 pistons go for?
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Old May 9, 2002 | 08:57 AM
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Default Re: Do i need to buy aftermarket vavles to rev up 9k? (MaliceGSR)

I would upgrade to ITR intake valves (larger), exhaust are the same as your B16


Oh wait, that's what I did, it should read I upgraded to.....
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Old May 9, 2002 | 09:05 AM
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Default Re: Do i need to buy aftermarket vavles to rev up 9k? (TodaSi)

itr valves aren't larger.. they are lighter.. and hes got a b18c1.. and yes.. it would be good to upgrade your valves for higher revs.. have fun.. it sure does like to scream when you pull it to 9 k
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Old May 9, 2002 | 09:30 AM
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Default Re: Do i need to buy aftermarket vavles to rev up 9k? (b16_ef)

just upgrade the intake valves? hmm...ok , sounds good. im putting this b16 head on my gsr block with some b16 pistons to raise the compression to about 11.4:1 how much are ITR valves? around 10 bux each?
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Old May 9, 2002 | 09:32 AM
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Default Re: Do i need to buy aftermarket vavles to rev up 9k? (MaliceGSR)

the head im using for this is a first gen B16 head.
ITR intake valves are lighter (stem turned) than first gen B16, and you are correct on the size. I was wrong...oops, thanks for keeping me honest
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Old May 9, 2002 | 03:41 PM
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Default Re: Do i need to buy aftermarket vavles to rev up 9k? (TodaSi)

itr valve prices anyone?
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Old May 12, 2002 | 11:38 AM
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Default Re: Do i need to buy aftermarket vavles to rev up 9k? (MaliceGSR)

definitely go with the lighter valves but make sure you use stiffer springs to match or you could get pretty bad valve float.
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Old May 12, 2002 | 05:49 PM
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Default Re: Do i need to buy aftermarket vavles to rev up 9k? (MaliceGSR)

how much porting? you might wanna get some oversized valves like ferra or something
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Old May 12, 2002 | 08:22 PM
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Default Re: Do i need to buy aftermarket vavles to rev up 9k? (allmtr)

No need to get over size valves if you are running N/A.
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Old May 13, 2002 | 03:41 PM
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Default Re: Do i need to buy aftermarket vavles to rev up 9k? (Ltech)

im just getting the normal portflow job. its gonna run me about 9 bills. once its all done my setup will be:

JDM B16 head with portflow headwork
Full Skunk2 valvetrain
Skunk2 stage 1 cams( currently in my GSR now)
B16 pistons( 11.4:1 compression on my GSR block)
5zigen header (2.5 inch collector)
ITR intake manifold
ITR tranny
Toda flywheel
Carsound cat
Skunk2 or Mugen chipped P28


cant wait till its all done. this ***** gonna fly! with good tuning im looking at easily over 200hp!

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