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Good valve, bad valve

Started by ACJ , Dec 13 2011 10:36 PM

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6 replies to this topic

#1 ACJ

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Name:adam
Location:south of Perth
Car:LH
Joined: 26-November 08

Posted 13 December 2011 - 10:36 PM

Hi all. I am after any information on Holden V8 valves, are any good for 600” lift and 7000 rpm if so which ones.
I have lot of VN valves but I have been told there are not much chop ? I have VL valves that I think are better but maybe still knot up to the job. I also have the ones in the pitcher below which are the same size as the VN and are in a set of stuff red heads that had 550” lift and sat on 6500 rpm ok but I am not sure what they are as they have no marking at all on them. Maybe old red head valves or maybe aftermarket ?
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#2 _Quagmire_

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Posted 13 December 2011 - 10:37 PM

l34 or yt valves are my guess....not sure if they will suit your application but

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#3 ACJ

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Name:adam
Location:south of Perth
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Posted 13 December 2011 - 10:58 PM

L34 was my guess to, but I don’t know. I thought yt had the yt simble in the center ?

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#4 _Quagmire_

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Posted 13 December 2011 - 11:17 PM

afaik some do some don't
maybe hit them lightly with the dremel or soak in petrol to remove the carbon?

Edited by Quagmire, 13 December 2011 - 11:19 PM.

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#5 _outer control_

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Posted 14 December 2011 - 12:21 AM

L34 ones had cut outs not much support in high lift apllications

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#6 N/A-PWR

CABIN ENGINE CONTROLS GALORE

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Name:Dave I
Location:Wooroloo, 65km's East of Perth
Car:'1969' LC RAT TORANA
Joined: 08-December 12

Posted 19 February 2013 - 04:22 PM

Hi all. I am after any information on Holden V8 valves, are any good for 600” lift and 7000 rpm if so which ones.
I have lot of VN valves but I have been told there are not much chop ? I have VL valves that I think are better but maybe still knot up to the job. I also have the ones in the pitcher below which are the same size as the VN and are in a set of stuff red heads that had 550” lift and sat on 6500 rpm ok but I am not sure what they are as they have no marking at all on them. Maybe old red head valves or maybe aftermarket ?

Hi ACJ,

This PDF is an eye opener. Dave I

http://www.manleyper...011_catalog.pdf

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#7 _nemo355v8_

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Posted 19 February 2013 - 11:29 PM

Bite the bullet and get a new set of decent valves and drop the new valves and head in to have the seats cut and valves cut to match at a machine shop.

Good seal between valves and head and decent quality valves will pay for them selfs in performance and fuel economy.

Not to mention if a valve snaps the head off and destroys a piston/rod/bore and punches holes in the head.

Yep been there done that.

Percision motor sports do a decent cheap set, thats what my machine shop supplied, some good prices on ebay if you research the specs you need