Slant Six Forum

: Hey Doug, would you assume the buick valves
: would be ok for a camshalf with aprox.
: .460-.467 lift? Is it possible to change
: anything by a few thousandths to get it
: closer in spec with a stock /6 valve lenth?

: A number of SL6 Racers use the Buick valves
: with lifts beond .470 and they work fine.
: The key is to have all the correct springs,
: retainers and locks (keepers) which go with
: the valve. The spring's Installed Height
: must be checked (seat pressure) Also be sure
: the guides are sized correctly seeing that
: different valves can have different stem
: diameters for oil clearance.
:
: To correct for the shorter Buick valve length,
: all you can do is mill the head. (this helps
: give back some pushrod adjuster turns)
: The other thing I have seen done is to
: "sink" the valve seat into the
: head deeper. This is NOT a good thing to do
: because it reduces flow.
:
: Let's face it, you have more to work with if
: the valve is a little longer, not shorter.
: DD

: Hey Doug, I was planning on milling the head
: .070,sounds like In your perspective, I will
: be ok.I think the valve size is about where
: I would like it.My machinist doesnt think
: going really big on the intake side is
: smart, and I kinda agree. Exhaust is usually
: where the hp gains are. Dealing with a whole
: different engine now, you tell me whats more
: important,intake or exh.? Thanx a Million

: To correct for the shorter Buick valve length,
: all you can do is mill the head. (this helps
: give back some pushrod adjuster turns)
: The other thing I have seen done is to
: "sink" the valve seat into the
: head deeper. This is NOT a good thing to do
: because it reduces flow.
:
: Let's face it, you have more to work with if
: the valve is a little longer, not shorter.
: DD

: Hello All,
: Even though milling the head would allow the
: pushrod to reach, the rocker geometry may be
: affected by the shorter valves, no? Maybe
: lash caps could be used to make the buick
: valves the same heigth as stock? I've seen
: lash caps in .060" and .080"
: Dave
:
: <snip

:
: ARE LASH CAPS SAFE? HOW MUCH MORE EXSPENSIVE IS
: IT? wHAT EXACTLY WOULD HAPPEN IF THE VALVE
: IS SHORTER, LOSS OF RPM? LOSS OF TQ? LOSS OF
: HP? pOSSIBLY BETTER, WHO KNOWS? tHANX

Author:	Max [ Fri Nov 02, 2001 11:59 am ]
Post subject:	DD??
Hey Doug, would you assume the buick valves would be ok for a camshalf with aprox. .460-.467 lift? Is it possible to change anything by a few thousandths to get it closer in spec with a stock /6 valve lenth? Thanx Do0dlebug19@aol.com

Author:	Doc [ Fri Nov 02, 2001 12:38 pm ]
Post subject:	Re: Buick Valves in a SL6
Quote: : Hey Doug, would you assume the buick valves : would be ok for a camshalf with aprox. : .460-.467 lift? Is it possible to change : anything by a few thousandths to get it : closer in spec with a stock /6 valve lenth? A number of SL6 Racers use the Buick valves with lifts beond .470 and they work fine. The key is to have all the correct springs, retainers and locks (keepers) which go with the valve. The spring's Installed Height must be checked (seat pressure) Also be sure the guides are sized correctly seeing that different valves can have different stem diameters for oil clearance. To correct for the shorter Buick valve length, all you can do is mill the head. (this helps give back some pushrod adjuster turns) The other thing I have seen done is to "sink" the valve seat into the head deeper. This is NOT a good thing to do because it reduces flow. Let's face it, you have more to work with if the valve is a little longer, not shorter. DD

Author:	Max [ Fri Nov 02, 2001 9:46 pm ]
Post subject:	Re: Buick Valves in a SL6
Quote: : A number of SL6 Racers use the Buick valves : with lifts beond .470 and they work fine. : The key is to have all the correct springs, : retainers and locks (keepers) which go with : the valve. The spring's Installed Height : must be checked (seat pressure) Also be sure : the guides are sized correctly seeing that : different valves can have different stem : diameters for oil clearance. : : To correct for the shorter Buick valve length, : all you can do is mill the head. (this helps : give back some pushrod adjuster turns) : The other thing I have seen done is to : "sink" the valve seat into the : head deeper. This is NOT a good thing to do : because it reduces flow. : : Let's face it, you have more to work with if : the valve is a little longer, not shorter. : DD Hey Doug, I was planning on milling the head .070,sounds like In your perspective, I will be ok.I think the valve size is about where I would like it.My machinist doesnt think going really big on the intake side is smart, and I kinda agree. Exhaust is usually where the hp gains are. Dealing with a whole different engine now, you tell me whats more important,intake or exh.? Thanx a Million Do0dlebug19@aol.com

Author:	Doctor Dodge (Doug Dutra) [ Sat Nov 03, 2001 9:03 am ]
Post subject:	Re: Buick Valves in a SL6
Quote: : Hey Doug, I was planning on milling the head : .070,sounds like In your perspective, I will : be ok.I think the valve size is about where : I would like it.My machinist doesnt think : going really big on the intake side is : smart, and I kinda agree. Exhaust is usually : where the hp gains are. Dealing with a whole : different engine now, you tell me whats more : important,intake or exh.? Thanx a Million You are in a good size range and yes, the exhaust side tends to need a little more effort, both side benifit for all the porting work you can give them, think "line of sight" or trying to take some of the bend out of the port as well as grinding-out all the restrictions. DD

Author:	Dave Brode [ Sun Nov 04, 2001 7:06 am ]
Post subject:	Re: Buick Valves in a SL6
Hello All, Even though milling the head would allow the pushrod to reach, the rocker geometry may be affected by the shorter valves, no? Maybe lash caps could be used to make the buick valves the same heigth as stock? I've seen lash caps in .060" and .080" Dave <snip Quote: : To correct for the shorter Buick valve length, : all you can do is mill the head. (this helps : give back some pushrod adjuster turns) : The other thing I have seen done is to : "sink" the valve seat into the : head deeper. This is NOT a good thing to do : because it reduces flow. : : Let's face it, you have more to work with if : the valve is a little longer, not shorter. : DD dbrode@hereintown.net

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Author:	Max [ Sun Nov 04, 2001 2:28 pm ]
Post subject:	Re: Buick Valves in a SL6
Quote: : Hello All, : Even though milling the head would allow the : pushrod to reach, the rocker geometry may be : affected by the shorter valves, no? Maybe : lash caps could be used to make the buick : valves the same heigth as stock? I've seen : lash caps in .060" and .080" : Dave : : <snip ARE LASH CAPS SAFE? HOW MUCH MORE EXSPENSIVE IS IT? wHAT EXACTLY WOULD HAPPEN IF THE VALVE IS SHORTER, LOSS OF RPM? LOSS OF TQ? LOSS OF HP? pOSSIBLY BETTER, WHO KNOWS? tHANX

Author:	Dave Brode [ Sun Nov 04, 2001 2:41 pm ]
Post subject:	Re: Buick Valves in a SL6
Lash caps are commonly used with valves that have no hard tip. They aren't real pricey. They also give more area for the rocker to work against [a good thing]. I assume that you may have rocker geometry problems with short valves. Some experts may be better able to advise. Dave Quote: : : ARE LASH CAPS SAFE? HOW MUCH MORE EXSPENSIVE IS : IT? wHAT EXACTLY WOULD HAPPEN IF THE VALVE : IS SHORTER, LOSS OF RPM? LOSS OF TQ? LOSS OF : HP? pOSSIBLY BETTER, WHO KNOWS? tHANX dbrode@hereintown.net

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